/***************************************************************************

    TMS34010: Portable Texas Instruments TMS34010 emulator

    Copyright (C) Alex Pasadyn/Zsolt Vasvari 1998
    Parts based on code by Aaron Giles

***************************************************************************/

#include <stddef.h>
#include "cpuintrf.h"
#include "debugger.h"
#include "tms34010.h"
#include "34010ops.h"
#include "osd_cpu.h"
#include "driver.h"


/***************************************************************************
    DEBUG STATE & STRUCTURES
***************************************************************************/

#define VERBOSE 			0
#define LOG_CONTROL_REGS	0
#define LOG_GRAPHICS_OPS	0

#if VERBOSE
#define LOG(x)	logerror x
#else
#define LOG(x)
#endif


/***************************************************************************
    CORE STATE
***************************************************************************/

/* TMS34010 State */
typedef struct
{
#ifdef LSB_FIRST
	INT16 x;
	INT16 y;
#else
	INT16 y;
	INT16 x;
#endif
} XY;

typedef struct tms34010_regs
{
	UINT16 op;
	UINT32 pc;
	UINT32 st;
	void (*pixel_write)(offs_t offset,UINT32 data);
	UINT32 (*pixel_read)(offs_t offset);
	 INT32 (*raster_op)(INT32 newpix, INT32 oldpix);
	UINT32 convsp;
	UINT32 convdp;
	UINT32 convmp;
	UINT16 *shiftreg;
	INT32 gfxcycles;
	UINT8 pixelshift;
	UINT8 is_34020;
	UINT8 reset_deferred;
	int (*irq_callback)(int irqline);
	const tms34010_config *config;
	emu_timer *scantimer;

	/* A registers 0-15 map to regs[0]-regs[15] */
	/* B registers 0-15 map to regs[30]-regs[15] */
	union
	{
		INT32 reg;
		XY xy;
	} regs[31];

	/* for the 34010, we only copy 32 of these into the new state */
	UINT16 IOregs[64];
} tms34010_regs;

#define TMS34010_STATE_SIZE		(offsetof(tms34010_regs, IOregs) + 32 * sizeof(UINT16))
#define TMS34020_STATE_SIZE		(offsetof(tms34010_regs, IOregs) + 64 * sizeof(UINT16))



/***************************************************************************
    GLOBAL VARIABLES
***************************************************************************/

/* public globals */
static int	tms34010_ICount;

/* internal state */
static tms34010_regs 	state;
static UINT8			external_host_access;
static UINT8			screen_to_cpu[MAX_SCREENS];
static UINT8			executing_cpu = 0xff;

/* default configuration */
static const tms34010_config default_config =
{
	0
};

static void check_interrupt(void);
static TIMER_CALLBACK( scanline_callback );
static void tms34010_state_postload(void);


/***************************************************************************
    FUNCTION TABLES
***************************************************************************/

extern void (*tms34010_wfield_functions[32])(offs_t offset,UINT32 data);
extern UINT32 (*tms34010_rfield_functions[64])(offs_t offset);


/***************************************************************************
    MACROS
***************************************************************************/

/* status register definitions */
#define STBIT_N			(1 << 31)
#define STBIT_C			(1 << 30)
#define STBIT_Z			(1 << 29)
#define STBIT_V			(1 << 28)
#define STBIT_P			(1 << 25)
#define STBIT_IE		(1 << 21)
#define STBIT_FE1		(1 << 11)
#define STBITS_F1		(0x1f << 6)
#define STBIT_FE0		(1 << 5)
#define STBITS_F0		(0x1f << 0)

/* register definitions and shortcuts */
#define PC				(state.pc)
#define ST				(state.st)
#define N_FLAG			(state.st & STBIT_N)
#define Z_FLAG			(state.st & STBIT_Z)
#define C_FLAG			(state.st & STBIT_C)
#define V_FLAG			(state.st & STBIT_V)
#define P_FLAG			(state.st & STBIT_P)
#define IE_FLAG			(state.st & STBIT_IE)
#define FE0_FLAG		(state.st & STBIT_FE0)
#define FE1_FLAG		(state.st & STBIT_FE1)

/* register file access */
#define AREG(i)			(state.regs[i].reg)
#define AREG_XY(i)		(state.regs[i].xy)
#define AREG_X(i)		(state.regs[i].xy.x)
#define AREG_Y(i)		(state.regs[i].xy.y)
#define BREG(i)			(state.regs[30 - (i)].reg)
#define BREG_XY(i)		(state.regs[30 - (i)].xy)
#define BREG_X(i)		(state.regs[30 - (i)].xy.x)
#define BREG_Y(i)		(state.regs[30 - (i)].xy.y)
#define SP				AREG(15)
#define FW(i)			((state.st >> (i ? 6 : 0)) & 0x1f)
#define FWEX(i)			((state.st >> (i ? 6 : 0)) & 0x3f)

/* opcode decode helpers */
#define SRCREG			((state.op >> 5) & 0x0f)
#define DSTREG			(state.op & 0x0f)
#define SKIP_WORD		(PC += (2 << 3))
#define SKIP_LONG		(PC += (4 << 3))
#define PARAM_K			((state.op >> 5) & 0x1f)
#define PARAM_N			(state.op & 0x1f)
#define PARAM_REL8		((INT8)state.op)

/* memory I/O */
#define WFIELD0(a,b)	(*tms34010_wfield_functions[FW(0)])(a,b)
#define WFIELD1(a,b)	(*tms34010_wfield_functions[FW(1)])(a,b)
#define RFIELD0(a)		(*tms34010_rfield_functions[FWEX(0)])(a)
#define RFIELD1(a)		(*tms34010_rfield_functions[FWEX(1)])(a)
#define WPIXEL(a,b)		state.pixel_write(a,b)
#define RPIXEL(a)		state.pixel_read(a)

/* Implied Operands */
#define SADDR			BREG(0)
#define SADDR_X			BREG_X(0)
#define SADDR_Y			BREG_Y(0)
#define SADDR_XY		BREG_XY(0)
#define SPTCH			BREG(1)
#define DADDR			BREG(2)
#define DADDR_X			BREG_X(2)
#define DADDR_Y			BREG_Y(2)
#define DADDR_XY		BREG_XY(2)
#define DPTCH			BREG(3)
#define OFFSET			BREG(4)
#define WSTART_X		BREG_X(5)
#define WSTART_Y		BREG_Y(5)
#define WEND_X			BREG_X(6)
#define WEND_Y			BREG_Y(6)
#define DYDX_X			BREG_X(7)
#define DYDX_Y			BREG_Y(7)
#define COLOR0			BREG(8)
#define COLOR1			BREG(9)
#define COUNT			BREG(10)
#define INC1_X			BREG_X(11)
#define INC1_Y			BREG_Y(11)
#define INC2_X			BREG_X(12)
#define INC2_Y			BREG_Y(12)
#define PATTRN			BREG(13)
#define TEMP			BREG(14)

/* I/O registers */
#define WINDOW_CHECKING	((IOREG(REG_CONTROL) >> 6) & 0x03)



/***************************************************************************
    INLINE SHORTCUTS
***************************************************************************/

/* Combine indiviual flags into the Status Register */
INLINE UINT32 GET_ST(void)
{
	return state.st;
}

/* Break up Status Register into indiviual flags */
INLINE void SET_ST(UINT32 st)
{
	state.st = st;
	/* interrupts might have been enabled, check it */
	check_interrupt();
}

/* Intialize Status to 0x0010 */
INLINE void RESET_ST(void)
{
	SET_ST(0x00000010);
}

/* shortcuts for reading opcodes */
INLINE UINT32 ROPCODE(void)
{
	UINT32 pc = TOBYTE(PC);
	PC += 2 << 3;
	return cpu_readop16(pc);
}

INLINE INT16 PARAM_WORD(void)
{
	UINT32 pc = TOBYTE(PC);
	PC += 2 << 3;
	return cpu_readop_arg16(pc);
}

INLINE INT32 PARAM_LONG(void)
{
	UINT32 pc = TOBYTE(PC);
	PC += 4 << 3;
	return (UINT16)cpu_readop_arg16(pc) | (cpu_readop_arg16(pc + 2) << 16);
}

INLINE INT16 PARAM_WORD_NO_INC(void)
{
	return cpu_readop_arg16(TOBYTE(PC));
}

INLINE INT32 PARAM_LONG_NO_INC(void)
{
	UINT32 pc = TOBYTE(PC);
	return (UINT16)cpu_readop_arg16(pc) | (cpu_readop_arg16(pc + 2) << 16);
}

/* read memory byte */
INLINE UINT32 RBYTE(offs_t offset)
{
	UINT32 ret;
	RFIELDMAC_8;
	return ret;
}

/* write memory byte */
INLINE void WBYTE(offs_t offset,UINT32 data)
{
	WFIELDMAC_8;
}

/* read memory long */
INLINE UINT32 RLONG(offs_t offset)
{
	RFIELDMAC_32;
}

/* write memory long */
INLINE void WLONG(offs_t offset,UINT32 data)
{
	WFIELDMAC_32;
}

/* pushes/pops a value from the stack */
INLINE void PUSH(UINT32 data)
{
	SP -= 0x20;
	WLONG(SP, data);
}

INLINE INT32 POP(void)
{
	INT32 ret = RLONG(SP);
	SP += 0x20;
	return ret;
}



/***************************************************************************
    PIXEL READS
***************************************************************************/

#define RP(m1,m2)  											\
	/* TODO: Plane masking */								\
	return (TMS34010_RDMEM_WORD(TOBYTE(offset & 0xfffffff0)) >> (offset & m1)) & m2;

static UINT32 read_pixel_1(offs_t offset) { RP(0x0f,0x01) }
static UINT32 read_pixel_2(offs_t offset) { RP(0x0e,0x03) }
static UINT32 read_pixel_4(offs_t offset) { RP(0x0c,0x0f) }
static UINT32 read_pixel_8(offs_t offset) { RP(0x08,0xff) }
static UINT32 read_pixel_16(offs_t offset)
{
	/* TODO: Plane masking */
	return TMS34010_RDMEM_WORD(TOBYTE(offset & 0xfffffff0));
}

/* Shift register read */
static UINT32 read_pixel_shiftreg(offs_t offset)
{
	if (state.config->to_shiftreg)
		state.config->to_shiftreg(offset, &state.shiftreg[0]);
	else
		fatalerror("To ShiftReg function not set. PC = %08X\n", PC);
	return state.shiftreg[0];
}



/***************************************************************************
    PIXEL WRITES
***************************************************************************/

/* No Raster Op + No Transparency */
#define WP(m1,m2)  																			\
	UINT32 a = TOBYTE(offset & 0xfffffff0);													\
	UINT32 pix = TMS34010_RDMEM_WORD(a);													\
	UINT32 shiftcount = offset & m1;														\
																							\
	/* TODO: plane masking */																\
	data &= m2;																				\
	pix = (pix & ~(m2 << shiftcount)) | (data << shiftcount);								\
	TMS34010_WRMEM_WORD(a, pix);															\

/* No Raster Op + Transparency */
#define WP_T(m1,m2)  																		\
	/* TODO: plane masking */																\
	data &= m2;																				\
	if (data)																				\
	{																						\
		UINT32 a = TOBYTE(offset & 0xfffffff0);												\
		UINT32 pix = TMS34010_RDMEM_WORD(a);												\
		UINT32 shiftcount = offset & m1;													\
																							\
		/* TODO: plane masking */															\
		pix = (pix & ~(m2 << shiftcount)) | (data << shiftcount);							\
		TMS34010_WRMEM_WORD(a, pix);														\
	}						  																\

/* Raster Op + No Transparency */
#define WP_R(m1,m2)  																		\
	UINT32 a = TOBYTE(offset & 0xfffffff0);													\
	UINT32 pix = TMS34010_RDMEM_WORD(a);													\
	UINT32 shiftcount = offset & m1;														\
																							\
	/* TODO: plane masking */																\
	data = state.raster_op(data & m2, (pix >> shiftcount) & m2) & m2;						\
	pix = (pix & ~(m2 << shiftcount)) | (data << shiftcount);								\
	TMS34010_WRMEM_WORD(a, pix);															\

/* Raster Op + Transparency */
#define WP_R_T(m1,m2)  																		\
	UINT32 a = TOBYTE(offset & 0xfffffff0);													\
	UINT32 pix = TMS34010_RDMEM_WORD(a);													\
	UINT32 shiftcount = offset & m1;														\
																							\
	/* TODO: plane masking */																\
	data = state.raster_op(data & m2, (pix >> shiftcount) & m2) & m2;						\
	if (data)																				\
	{																						\
		pix = (pix & ~(m2 << shiftcount)) | (data << shiftcount);							\
		TMS34010_WRMEM_WORD(a, pix);														\
	}						  																\


/* No Raster Op + No Transparency */
static void write_pixel_1(offs_t offset,UINT32 data) { WP(0x0f, 0x01); }
static void write_pixel_2(offs_t offset,UINT32 data) { WP(0x0e, 0x03); }
static void write_pixel_4(offs_t offset,UINT32 data) { WP(0x0c, 0x0f); }
static void write_pixel_8(offs_t offset,UINT32 data) { WP(0x08, 0xff); }
static void write_pixel_16(offs_t offset,UINT32 data)
{
	/* TODO: plane masking */
	TMS34010_WRMEM_WORD(TOBYTE(offset & 0xfffffff0), data);
}

/* No Raster Op + Transparency */
static void write_pixel_t_1(offs_t offset,UINT32 data) { WP_T(0x0f, 0x01); }
static void write_pixel_t_2(offs_t offset,UINT32 data) { WP_T(0x0e, 0x03); }
static void write_pixel_t_4(offs_t offset,UINT32 data) { WP_T(0x0c, 0x0f); }
static void write_pixel_t_8(offs_t offset,UINT32 data) { WP_T(0x08, 0xff); }
static void write_pixel_t_16(offs_t offset,UINT32 data)
{
	/* TODO: plane masking */
	if (data)
		TMS34010_WRMEM_WORD(TOBYTE(offset & 0xfffffff0), data);
}

/* Raster Op + No Transparency */
static void write_pixel_r_1(offs_t offset,UINT32 data) { WP_R(0x0f, 0x01); }
static void write_pixel_r_2(offs_t offset,UINT32 data) { WP_R(0x0e, 0x03); }
static void write_pixel_r_4(offs_t offset,UINT32 data) { WP_R(0x0c, 0x0f); }
static void write_pixel_r_8(offs_t offset,UINT32 data) { WP_R(0x08, 0xff); }
static void write_pixel_r_16(offs_t offset,UINT32 data)
{
	/* TODO: plane masking */
	UINT32 a = TOBYTE(offset & 0xfffffff0);
	TMS34010_WRMEM_WORD(a, state.raster_op(data, TMS34010_RDMEM_WORD(a)));
}

/* Raster Op + Transparency */
static void write_pixel_r_t_1(offs_t offset,UINT32 data) { WP_R_T(0x0f,0x01); }
static void write_pixel_r_t_2(offs_t offset,UINT32 data) { WP_R_T(0x0e,0x03); }
static void write_pixel_r_t_4(offs_t offset,UINT32 data) { WP_R_T(0x0c,0x0f); }
static void write_pixel_r_t_8(offs_t offset,UINT32 data) { WP_R_T(0x08,0xff); }
static void write_pixel_r_t_16(offs_t offset,UINT32 data)
{
	/* TODO: plane masking */
	UINT32 a = TOBYTE(offset & 0xfffffff0);
	data = state.raster_op(data, TMS34010_RDMEM_WORD(a));

	if (data)
		TMS34010_WRMEM_WORD(a, data);
}

/* Shift register write */
static void write_pixel_shiftreg(offs_t offset,UINT32 data)
{
	if (state.config->from_shiftreg)
		state.config->from_shiftreg(offset, &state.shiftreg[0]);
	else
		fatalerror("From ShiftReg function not set. PC = %08X\n", PC);
}



/***************************************************************************
    RASTER OPS
***************************************************************************/

/* Raster operations */
static INT32 raster_op_1(INT32 newpix, INT32 oldpix)  { return newpix & oldpix; }
static INT32 raster_op_2(INT32 newpix, INT32 oldpix)  { return newpix & ~oldpix; }
static INT32 raster_op_3(INT32 newpix, INT32 oldpix)  { return 0; }
static INT32 raster_op_4(INT32 newpix, INT32 oldpix)  { return newpix | ~oldpix; }
static INT32 raster_op_5(INT32 newpix, INT32 oldpix)  { return ~(newpix ^ oldpix); }
static INT32 raster_op_6(INT32 newpix, INT32 oldpix)  { return ~oldpix; }
static INT32 raster_op_7(INT32 newpix, INT32 oldpix)  { return ~(newpix | oldpix); }
static INT32 raster_op_8(INT32 newpix, INT32 oldpix)  { return newpix | oldpix; }
static INT32 raster_op_9(INT32 newpix, INT32 oldpix)  { return oldpix; }
static INT32 raster_op_10(INT32 newpix, INT32 oldpix) { return newpix ^ oldpix; }
static INT32 raster_op_11(INT32 newpix, INT32 oldpix) { return ~newpix & oldpix; }
static INT32 raster_op_12(INT32 newpix, INT32 oldpix) { return 0xffff; }
static INT32 raster_op_13(INT32 newpix, INT32 oldpix) { return ~newpix | oldpix; }
static INT32 raster_op_14(INT32 newpix, INT32 oldpix) { return ~(newpix & oldpix); }
static INT32 raster_op_15(INT32 newpix, INT32 oldpix) { return ~newpix; }
static INT32 raster_op_16(INT32 newpix, INT32 oldpix) { return newpix + oldpix; }
static INT32 raster_op_17(INT32 newpix, INT32 oldpix)
{
	INT32 max = (UINT32)0xffffffff >> (32 - IOREG(REG_PSIZE));
	INT32 res = newpix + oldpix;
	return (res > max) ? max : res;
}
static INT32 raster_op_18(INT32 newpix, INT32 oldpix) { return oldpix - newpix; }
static INT32 raster_op_19(INT32 newpix, INT32 oldpix) { return (oldpix > newpix) ? oldpix - newpix : 0; }
static INT32 raster_op_20(INT32 newpix, INT32 oldpix) { return (oldpix > newpix) ? oldpix : newpix; }
static INT32 raster_op_21(INT32 newpix, INT32 oldpix) { return (oldpix > newpix) ? newpix : oldpix; }



/***************************************************************************
    OPCODE TABLE & IMPLEMENTATIONS
***************************************************************************/

/* includes the static function prototypes and the master opcode table */
#include "34010tbl.c"

/* includes the actual opcode implementations */
#include "34010ops.c"
#include "34010gfx.c"



/***************************************************************************
    Internal interrupt check
****************************************************************************/

/* Generate pending interrupts. */
static void check_interrupt(void)
{
	int vector = 0;
	int irqline = -1;
	int irq;

	/* if we're not actively executing, skip it */
	if (executing_cpu != 0xff && executing_cpu != cpu_getactivecpu())
		return;

	/* check for NMI first */
	if (IOREG(REG_HSTCTLH) & 0x0100)
	{
		LOG(("TMS34010#%d takes NMI\n", cpu_getactivecpu()));

		/* ack the NMI */
		IOREG(REG_HSTCTLH) &= ~0x0100;

		/* handle NMI mode bit */
		if (!(IOREG(REG_HSTCTLH) & 0x0200))
		{
			PUSH(PC);
			PUSH(GET_ST());
		}

		/* leap to the vector */
		RESET_ST();
		PC = RLONG(0xfffffee0);
		change_pc(TOBYTE(PC));
		COUNT_CYCLES(16);
		return;
	}

	/* early out if everything else is disabled */
	irq = IOREG(REG_INTPEND) & IOREG(REG_INTENB);
	if (!IE_FLAG || !irq)
		return;

	/* host interrupt */
	if (irq & TMS34010_HI)
	{
		LOG(("TMS34010#%d takes HI\n", cpu_getactivecpu()));
		vector = 0xfffffec0;
	}

	/* display interrupt */
	else if (irq & TMS34010_DI)
	{
		LOG(("TMS34010#%d takes DI\n", cpu_getactivecpu()));
		vector = 0xfffffea0;
	}

	/* window violation interrupt */
	else if (irq & TMS34010_WV)
	{
		LOG(("TMS34010#%d takes WV\n", cpu_getactivecpu()));
		vector = 0xfffffe80;
	}

	/* external 1 interrupt */
	else if (irq & TMS34010_INT1)
	{
		LOG(("TMS34010#%d takes INT1\n", cpu_getactivecpu()));
		vector = 0xffffffc0;
		irqline = 0;
	}

	/* external 2 interrupt */
	else if (irq & TMS34010_INT2)
	{
		LOG(("TMS34010#%d takes INT2\n", cpu_getactivecpu()));
		vector = 0xffffffa0;
		irqline = 1;
	}

	/* if we took something, generate it */
	if (vector)
	{
		PUSH(PC);
		PUSH(GET_ST());
		RESET_ST();
		PC = RLONG(vector);
		change_pc(TOBYTE(PC));
		COUNT_CYCLES(16);

		/* call the callback for externals */
		if (irqline >= 0)
			(void)(*state.irq_callback)(irqline);
	}
}



/***************************************************************************
    Reset the CPU emulation
***************************************************************************/

static void tms34010_init(int index, int clock, const void *_config, int (*irqcallback)(int))
{
	const tms34010_config *config = _config ? _config : &default_config;

	external_host_access = FALSE;

	state.config = config;
	state.irq_callback = irqcallback;

	/* if we have a scanline callback, make us the owner of this screen */
	if (config->scanline_callback != NULL)
		screen_to_cpu[config->scrnum] = index;

	/* allocate a scanline timer and set it to go off at the start */
	state.scantimer = timer_alloc(scanline_callback, NULL);
	timer_adjust(state.scantimer, attotime_zero, index, attotime_zero);

	/* allocate the shiftreg */
	state.shiftreg = auto_malloc(SHIFTREG_SIZE);

	state_save_register_item("tms34010", index, state.op);
	state_save_register_item("tms34010", index, state.pc);
	state_save_register_item("tms34010", index, state.st);
	state_save_register_item("tms34010", index, state.reset_deferred);
	state_save_register_item_pointer("tms34010", index, state.shiftreg, SHIFTREG_SIZE / 2);
	state_save_register_item_array("tms34010", index, state.IOregs);
	state_save_register_item("tms34010", index, state.convsp);
	state_save_register_item("tms34010", index, state.convdp);
	state_save_register_item("tms34010", index, state.convmp);
	state_save_register_item("tms34010", index, state.pixelshift);
	state_save_register_item("tms34010", index, state.gfxcycles);
	state_save_register_item_pointer("tms34010", index, (&state.regs[0].reg), ARRAY_LENGTH(state.regs));
	state_save_register_func_postload(tms34010_state_postload);
}

static void tms34010_reset(void)
{
	const tms34010_config *config;
	emu_timer *save_scantimer;
	int (*save_irqcallback)(int);
	UINT16 *shiftreg;

	/* zap the state and copy in the config pointer */
	config = state.config;
	shiftreg = state.shiftreg;
	save_irqcallback = state.irq_callback;
	save_scantimer = state.scantimer;
	memset(&state, 0, sizeof(state));
	state.shiftreg = shiftreg;
	state.config = config;
	state.irq_callback = save_irqcallback;
	state.scantimer = save_scantimer;

	/* fetch the initial PC and reset the state */
	PC = RLONG(0xffffffe0) & 0xfffffff0;
	change_pc(TOBYTE(PC));
	RESET_ST();

	/* HALT the CPU if requested, and remember to re-read the starting PC */
	/* the first time we are run */
	state.reset_deferred = state.config->halt_on_reset;
	if (state.config->halt_on_reset)
		tms34010_io_register_w(REG_HSTCTLH, 0x8000, 0);
}

#if (HAS_TMS34020)
static void tms34020_reset(void)
{
	tms34010_reset();
	state.is_34020 = 1;
}
#endif



/***************************************************************************
    Shut down the CPU emulation
***************************************************************************/

static void tms34010_exit(void)
{
	state.shiftreg = NULL;
}



/***************************************************************************
    Get all registers in given buffer
***************************************************************************/

static void tms34010_get_context(void *dst)
{
	if (dst)
		memcpy(dst, &state, TMS34010_STATE_SIZE);
}

#if (HAS_TMS34020)
static void tms34020_get_context(void *dst)
{
	if (dst)
		memcpy(dst, &state, TMS34020_STATE_SIZE);
}
#endif



/***************************************************************************
    Set all registers to given values
***************************************************************************/

static void tms34010_set_context(void *src)
{
	if (src)
		memcpy(&state, src, TMS34010_STATE_SIZE);
	change_pc(TOBYTE(PC));
}

#if (HAS_TMS34020)
static void tms34020_set_context(void *src)
{
	if (src)
		memcpy(&state, src, TMS34020_STATE_SIZE);
	change_pc(TOBYTE(PC));
}
#endif



/***************************************************************************
    Set IRQ line state
***************************************************************************/

static void set_irq_line(int irqline, int linestate)
{
	LOG(("TMS34010#%d set irq line %d state %d\n", cpu_getactivecpu(), irqline, linestate));

	/* set the pending interrupt */
	switch (irqline)
	{
		case 0:
			if (linestate != CLEAR_LINE)
				IOREG(REG_INTPEND) |= TMS34010_INT1;
			else
				IOREG(REG_INTPEND) &= ~TMS34010_INT1;
			break;

		case 1:
			if (linestate != CLEAR_LINE)
				IOREG(REG_INTPEND) |= TMS34010_INT2;
			else
				IOREG(REG_INTPEND) &= ~TMS34010_INT2;
			break;
	}
}



/***************************************************************************
    Generate internal interrupt
***************************************************************************/

static TIMER_CALLBACK( internal_interrupt_callback )
{
	int cpunum = param & 0xff;
	int type = param >> 8;

	/* call through to the CPU to generate the int */
	cpuintrf_push_context(cpunum);
	IOREG(REG_INTPEND) |= type;
	LOG(("TMS34010#%d set internal interrupt $%04x\n", cpu_getactivecpu(), type));
	cpuintrf_pop_context();

	/* generate triggers so that spin loops can key off them */
	cpu_triggerint(cpunum);
}



/***************************************************************************
    Execute
***************************************************************************/

static int tms34010_execute(int cycles)
{
	/* Get out if CPU is halted. Absolutely no interrupts must be taken!!! */
	if (IOREG(REG_HSTCTLH) & 0x8000)
		return cycles;

	/* if the CPU's reset was deferred, do it now */
	if (state.reset_deferred)
	{
		state.reset_deferred = 0;
		PC = RLONG(0xffffffe0);
	}

	/* execute starting now */
	tms34010_ICount = cycles;
	change_pc(TOBYTE(PC));

	/* check interrupts first */
	executing_cpu = cpu_getactivecpu();
	check_interrupt();
	do
	{

		#ifdef	MAME_DEBUG
		if (Machine->debug_mode) { state.st = GET_ST(); mame_debug_hook(); }
		#endif
		state.op = ROPCODE();
		(*opcode_table[state.op >> 4])();

	} while (tms34010_ICount > 0);
	executing_cpu = 0xff;

	return cycles - tms34010_ICount;
}



/***************************************************************************
    PIXEL OPS
***************************************************************************/

static void (*const pixel_write_ops[4][5])(offs_t offset,UINT32 data) =
{
	{ write_pixel_1,     write_pixel_2,     write_pixel_4,     write_pixel_8,     write_pixel_16     },
	{ write_pixel_r_1,   write_pixel_r_2,   write_pixel_r_4,   write_pixel_r_8,   write_pixel_r_16   },
	{ write_pixel_t_1,   write_pixel_t_2,   write_pixel_t_4,   write_pixel_t_8,   write_pixel_t_16   },
	{ write_pixel_r_t_1, write_pixel_r_t_2, write_pixel_r_t_4, write_pixel_r_t_8, write_pixel_r_t_16 }
};

static UINT32 (*const pixel_read_ops[5])(offs_t offset) =
{
	read_pixel_1,        read_pixel_2,      read_pixel_4,      read_pixel_8,      read_pixel_16
};


static void set_pixel_function(void)
{
	UINT32 i1,i2;

	if (IOREG(REG_DPYCTL) & 0x0800)
	{
		/* Shift Register Transfer */
		state.pixel_write = write_pixel_shiftreg;
		state.pixel_read  = read_pixel_shiftreg;
		return;
	}

	switch (IOREG(REG_PSIZE))
	{
		default:
		case 0x01: i2 = 0; break;
		case 0x02: i2 = 1; break;
		case 0x04: i2 = 2; break;
		case 0x08: i2 = 3; break;
		case 0x10: i2 = 4; break;
	}

	if (IOREG(REG_CONTROL) & 0x20)
		i1 = state.raster_op ? 3 : 2;
	else
		i1 = state.raster_op ? 1 : 0;

	state.pixel_write = pixel_write_ops[i1][i2];
	state.pixel_read  = pixel_read_ops [i2];
}



/***************************************************************************
    RASTER OPS
***************************************************************************/

static INT32 (*const raster_ops[32]) (INT32 newpix, INT32 oldpix) =
{
	           0, raster_op_1 , raster_op_2 , raster_op_3,
	raster_op_4 , raster_op_5 , raster_op_6 , raster_op_7,
	raster_op_8 , raster_op_9 , raster_op_10, raster_op_11,
	raster_op_12, raster_op_13, raster_op_14, raster_op_15,
	raster_op_16, raster_op_17, raster_op_18, raster_op_19,
	raster_op_20, raster_op_21,            0,            0,
	           0,            0,            0,            0,
	           0,            0,            0,            0,
};


static void set_raster_op(void)
{
	state.raster_op = raster_ops[(IOREG(REG_CONTROL) >> 10) & 0x1f];
}



/***************************************************************************
    VIDEO TIMING HELPERS
***************************************************************************/

static TIMER_CALLBACK( scanline_callback )
{
	const screen_state *screen;
	int vsblnk, veblnk, vtotal;
	int vcount = param >> 8;
	int cpunum = param & 0xff;
	int enabled;
	int master;

	/* set the CPU context */
	cpuintrf_push_context(cpunum);
	screen = &machine->screen[state.config->scrnum];

	/* fetch the core timing parameters */
	enabled = SMART_IOREG(DPYCTL) & 0x8000;
	master = (state.is_34020 || (SMART_IOREG(DPYCTL) & 0x2000));
	vsblnk = SMART_IOREG(VSBLNK);
	veblnk = SMART_IOREG(VEBLNK);
	vtotal = SMART_IOREG(VTOTAL);
	if (!master)
	{
		vtotal = MIN(screen->height - 1, vtotal);
		vcount = video_screen_get_vpos(state.config->scrnum);
	}

	/* update the VCOUNT */
	SMART_IOREG(VCOUNT) = vcount;

	/* if we match the display interrupt scanline, signal an interrupt */
	if (enabled && vcount == SMART_IOREG(DPYINT))
	{
		/* generate the display interrupt signal */
		internal_interrupt_callback(machine, NULL, cpunum | (TMS34010_DI << 8));
	}

	/* at the start of VBLANK, load the starting display address */
	if (vcount == vsblnk)
	{
		/* 34010 loads DPYADR with DPYSTRT, and inverts if the origin is 0 */
		if (!state.is_34020)
		{
			IOREG(REG_DPYADR) = IOREG(REG_DPYSTRT);
			LOG(("Start of VBLANK, DPYADR = %04X\n", IOREG(REG_DPYADR)));
		}

		/* 34020 loads DPYNXx with DPYSTx */
		else
		{
			IOREG(REG020_DPYNXL) = IOREG(REG020_DPYSTL) & 0xffe0;
			IOREG(REG020_DPYNXH) = IOREG(REG020_DPYSTH);
		}
	}

	/* at the end of the screen, update the display parameters */
	if (vcount == vtotal)
	{
		/* only do this if we have an incoming pixel clock */
		/* also, only do it if the HEBLNK/HSBLNK values are stable */
		if (master && state.config->scanline_callback != NULL)
		{
			int htotal = SMART_IOREG(HTOTAL);
			if (htotal > 0 && vtotal > 0)
			{
				attoseconds_t refresh = HZ_TO_ATTOSECONDS(state.config->pixclock) * (htotal + 1) * (vtotal + 1);
				int width = (htotal + 1) * state.config->pixperclock;
				int height = vtotal + 1;
				rectangle visarea;

				/* extract the visible area */
				visarea.min_x = SMART_IOREG(HEBLNK) * state.config->pixperclock;
				visarea.max_x = SMART_IOREG(HSBLNK) * state.config->pixperclock - 1;
				visarea.min_y = veblnk;
				visarea.max_y = vsblnk - 1;

				/* if everything looks good, set the info */
				if (visarea.min_x < visarea.max_x && visarea.max_x <= width && visarea.min_y < visarea.max_y && visarea.max_y <= height)
				{
					/* because many games play with the HEBLNK/HSBLNK for effects, we don't change
                       if they are the only thing that has changed */
					if (width != screen->width || height != screen->height || visarea.min_y != screen->visarea.min_y || visarea.max_y != screen->visarea.max_y)
						video_screen_configure(state.config->scrnum, width, height, &visarea, refresh);
				}

				LOG(("Configuring screen: HTOTAL=%3d BLANK=%3d-%3d VTOTAL=%3d BLANK=%3d-%3d refresh=%f\n",
						htotal, SMART_IOREG(HEBLNK), SMART_IOREG(HSBLNK), vtotal, veblnk, vsblnk, ATTOSECONDS_TO_HZ(refresh)));

				/* interlaced timing not supported */
				if ((SMART_IOREG(DPYCTL) & 0x4000) == 0)
					fatalerror("Interlaced video configured on the TMS34010 (unsupported)");
			}
		}
	}

	/* force a partial update within the visible area */
	if (vcount >= screen->visarea.min_y && vcount <= screen->visarea.max_y && state.config->scanline_callback != NULL)
		video_screen_update_partial(state.config->scrnum, vcount);

	/* if we are in the visible area, increment DPYADR by DUDATE */
	if (vcount >= veblnk && vcount < vsblnk)
	{
		/* 34010 increments by the DUDATE field in DPYCTL */
		if (!state.is_34020)
		{
			UINT16 dpyadr = IOREG(REG_DPYADR);
			if ((dpyadr & 3) == 0)
				dpyadr = ((dpyadr & 0xfffc) - (IOREG(REG_DPYCTL) & 0x03fc)) | (IOREG(REG_DPYSTRT) & 0x0003);
			else
				dpyadr = (dpyadr & 0xfffc) | ((dpyadr - 1) & 3);
			IOREG(REG_DPYADR) = dpyadr;
		}

		/* 34020 updates based on the DINC register, including zoom */
		else
		{
			UINT32 dpynx = IOREG(REG020_DPYNXL) | (IOREG(REG020_DPYNXH) << 16);
			UINT32 dinc = IOREG(REG020_DINCL) | (IOREG(REG020_DINCH) << 16);
			dpynx = (dpynx & 0xffffffe0) | ((dpynx + dinc) & 0x1f);
			if ((dpynx & 0x1f) == 0)
				dpynx += dinc & 0xffffffe0;
			IOREG(REG020_DPYNXL) = dpynx;
			IOREG(REG020_DPYNXH) = dpynx >> 16;
		}
	}

	/* adjust for the next callback */
	vcount++;
	if (vcount > vtotal)
		vcount = 0;

	/* note that we add !master (0 or 1) as a attoseconds value; this makes no practical difference */
	/* but helps ensure that masters are updated first before slaves */
	timer_adjust(state.scantimer, attotime_add_attoseconds(video_screen_get_time_until_pos(state.config->scrnum, vcount, 0), !master), cpunum | (vcount << 8), attotime_zero);

	/* restore the context */
	cpuintrf_pop_context();
}


void tms34010_get_display_params(int cpunum, tms34010_display_params *params)
{
	cpuintrf_push_context(cpunum);

	params->enabled = ((SMART_IOREG(DPYCTL) & 0x8000) != 0);
	params->vcount = SMART_IOREG(VCOUNT);
	params->veblnk = SMART_IOREG(VEBLNK);
	params->vsblnk = SMART_IOREG(VSBLNK);
	params->heblnk = SMART_IOREG(HEBLNK) * state.config->pixperclock;
	params->hsblnk = SMART_IOREG(HSBLNK) * state.config->pixperclock;

	/* 34010 gets its address from DPYADR and DPYTAP */
	if (!state.is_34020)
	{
		UINT16 dpyadr = IOREG(REG_DPYADR);
		if (!(IOREG(REG_DPYCTL) & 0x0400))
			dpyadr ^= 0xfffc;
		params->rowaddr = dpyadr >> 4;
		params->coladdr = ((dpyadr & 0x007c) << 4) | (IOREG(REG_DPYTAP) & 0x3fff);
		params->yoffset = (IOREG(REG_DPYSTRT) - IOREG(REG_DPYADR)) & 3;
	}

	/* 34020 gets its address from DPYNX */
	else
	{
		params->rowaddr = IOREG(REG020_DPYNXH);
		params->coladdr = IOREG(REG020_DPYNXL) & 0xffe0;
		params->yoffset = 0;
		if ((IOREG(REG020_DINCL) & 0x1f) != 0)
			params->yoffset = (IOREG(REG020_DPYNXL) & 0x1f) / (IOREG(REG020_DINCL) & 0x1f);
	}

	cpuintrf_pop_context();
}


VIDEO_UPDATE( tms340x0 )
{
	pen_t blackpen = get_black_pen(machine);
	tms34010_display_params params;
	int x;

	/* get the display parameters for the screen */
	tms34010_get_display_params(screen_to_cpu[screen], &params);

	/* if the display is enabled, call the scanline callback */
	if (params.enabled)
	{
		/* call through to the callback */
		LOG(("  Update: scan=%3d ROW=%04X COL=%04X\n", cliprect->min_y, params.rowaddr, params.coladdr));
		(*state.config->scanline_callback)(machine, screen, bitmap, cliprect->min_y, &params);
	}

	/* otherwise, just blank the current scanline */
	else
		params.heblnk = params.hsblnk = cliprect->max_x + 1;

	/* blank out the blank regions */
	if (bitmap->bpp == 16)
	{
		UINT16 *dest = BITMAP_ADDR16(bitmap, cliprect->min_y, 0);
		for (x = cliprect->min_x; x < params.heblnk; x++)
			dest[x] = blackpen;
		for (x = params.hsblnk; x <= cliprect->max_y; x++)
			dest[x] = blackpen;
	}
	else if (bitmap->bpp == 32)
	{
		UINT32 *dest = BITMAP_ADDR32(bitmap, cliprect->min_y, 0);
		for (x = cliprect->min_x; x < params.heblnk; x++)
			dest[x] = blackpen;
		for (x = params.hsblnk; x <= cliprect->max_y; x++)
			dest[x] = blackpen;
	}
	return 0;
}


/***************************************************************************
    I/O REGISTER WRITES
***************************************************************************/

static const char *const ioreg_name[] =
{
	"HESYNC", "HEBLNK", "HSBLNK", "HTOTAL",
	"VESYNC", "VEBLNK", "VSBLNK", "VTOTAL",
	"DPYCTL", "DPYSTART", "DPYINT", "CONTROL",
	"HSTDATA", "HSTADRL", "HSTADRH", "HSTCTLL",

	"HSTCTLH", "INTENB", "INTPEND", "CONVSP",
	"CONVDP", "PSIZE", "PMASK", "RESERVED",
	"RESERVED", "RESERVED", "RESERVED", "DPYTAP",
	"HCOUNT", "VCOUNT", "DPYADR", "REFCNT"
};

WRITE16_HANDLER( tms34010_io_register_w )
{
	int cpunum = cpu_getactivecpu();
	int oldreg, newreg;

	/* Set register */
	oldreg = IOREG(offset);
	IOREG(offset) = data;

	switch (offset)
	{
		case REG_CONTROL:
			set_raster_op();
			set_pixel_function();
			break;

		case REG_PSIZE:
			set_pixel_function();

			switch (data)
			{
				default:
				case 0x01: state.pixelshift = 0; break;
				case 0x02: state.pixelshift = 1; break;
				case 0x04: state.pixelshift = 2; break;
				case 0x08: state.pixelshift = 3; break;
				case 0x10: state.pixelshift = 4; break;
			}
			break;

		case REG_PMASK:
			if (data) logerror("Plane masking not supported. PC=%08X\n", activecpu_get_pc());
			break;

		case REG_DPYCTL:
			set_pixel_function();
			break;

		case REG_HSTCTLH:
			/* if the CPU is halting itself, stop execution right away */
			if ((data & 0x8000) && !external_host_access)
				tms34010_ICount = 0;
			cpunum_set_input_line(cpunum, INPUT_LINE_HALT, (data & 0x8000) ? ASSERT_LINE : CLEAR_LINE);

			/* NMI issued? */
			if (data & 0x0100)
				timer_call_after_resynch(NULL, cpunum, internal_interrupt_callback);
			break;

		case REG_HSTCTLL:
			/* the TMS34010 can change MSGOUT, can set INTOUT, and can clear INTIN */
			if (!external_host_access)
			{
				newreg = (oldreg & 0xff8f) | (data & 0x0070);
				newreg |= data & 0x0080;
				newreg &= data | ~0x0008;
			}

			/* the host can change MSGIN, can set INTIN, and can clear INTOUT */
			else
			{
				newreg = (oldreg & 0xfff8) | (data & 0x0007);
				newreg &= data | ~0x0080;
				newreg |= data & 0x0008;
			}
			IOREG(offset) = newreg;

			/* the TMS34010 can set output interrupt? */
			if (!(oldreg & 0x0080) && (newreg & 0x0080))
			{
				if (state.config->output_int)
					(*state.config->output_int)(1);
			}
			else if ((oldreg & 0x0080) && !(newreg & 0x0080))
			{
				if (state.config->output_int)
					(*state.config->output_int)(0);
			}

			/* input interrupt? (should really be state-based, but the functions don't exist!) */
			if (!(oldreg & 0x0008) && (newreg & 0x0008))
				timer_call_after_resynch(NULL, cpunum | (TMS34010_HI << 8), internal_interrupt_callback);
			else if ((oldreg & 0x0008) && !(newreg & 0x0008))
				IOREG(REG_INTPEND) &= ~TMS34010_HI;
			break;

		case REG_CONVSP:
			state.convsp = 1 << (~data & 0x1f);
			break;

		case REG_CONVDP:
			state.convdp = 1 << (~data & 0x1f);
			break;

		case REG_INTENB:
			check_interrupt();
			break;

		case REG_INTPEND:
			/* X1P, X2P and HIP are read-only */
			/* WVP and DIP can only have 0's written to them */
			IOREG(REG_INTPEND) = oldreg;
			if (!(data & TMS34010_WV))
				IOREG(REG_INTPEND) &= ~TMS34010_WV;
			if (!(data & TMS34010_DI))
				IOREG(REG_INTPEND) &= ~TMS34010_DI;
			break;
	}

	if (LOG_CONTROL_REGS)
		logerror("CPU#%d@%08X: %s = %04X (%d)\n", cpunum, activecpu_get_pc(), ioreg_name[offset], IOREG(offset), video_screen_get_vpos(state.config->scrnum));
}


static const char *const ioreg020_name[] =
{
	"VESYNC", "HESYNC", "VEBLNK", "HEBLNK",
	"VSBLNK", "HSBLNK", "VTOTAL", "HTOTAL",
	"DPYCTL", "DPYSTRT", "DPYINT", "CONTROL",
	"HSTDATA", "HSTADRL", "HSTADRH", "HSTCTLL",

	"HSTCTLH", "INTENB", "INTPEND", "CONVSP",
	"CONVDP", "PSIZE", "PMASKL", "PMASKH",
	"CONVMP", "CONTROL2", "CONFIG", "DPYTAP",
	"VCOUNT", "HCOUNT", "DPYADR", "REFADR",

	"DPYSTL", "DPYSTH", "DPYNXL", "DPYNXH",
	"DINCL", "DINCH", "RES0", "HESERR",
	"RES1", "RES2", "RES3", "RES4",
	"SCOUNT", "BSFLTST", "DPYMSK", "RES5",

	"SETVCNT", "SETHCNT", "BSFLTDL", "BSFLTDH",
	"RES6", "RES7", "RES8", "RES9",
	"IHOST1L", "IHOST1H", "IHOST2L", "IHOST2H",
	"IHOST3L", "IHOST3H", "IHOST4L", "IHOST4H"
};

WRITE16_HANDLER( tms34020_io_register_w )
{
	int cpunum = cpu_getactivecpu();
	int oldreg, newreg;

	/* Set register */
	oldreg = IOREG(offset);
	IOREG(offset) = data;

	if (LOG_CONTROL_REGS)
		logerror("CPU#%d@%08X: %s = %04X (%d)\n", cpunum, activecpu_get_pc(), ioreg020_name[offset], IOREG(offset), video_screen_get_vpos(state.config->scrnum));

	switch (offset)
	{
		case REG020_CONTROL:
		case REG020_CONTROL2:
			IOREG(REG020_CONTROL) = data;
			IOREG(REG020_CONTROL2) = data;
			set_raster_op();
			set_pixel_function();
			break;

		case REG020_PSIZE:
			set_pixel_function();

			switch (data)
			{
				default:
				case 0x01: state.pixelshift = 0; break;
				case 0x02: state.pixelshift = 1; break;
				case 0x04: state.pixelshift = 2; break;
				case 0x08: state.pixelshift = 3; break;
				case 0x10: state.pixelshift = 4; break;
			}
			break;

		case REG020_PMASKL:
		case REG020_PMASKH:
			if (data) logerror("Plane masking not supported. PC=%08X\n", activecpu_get_pc());
			break;

		case REG020_DPYCTL:
			set_pixel_function();
			break;

		case REG020_HSTCTLH:
			/* if the CPU is halting itself, stop execution right away */
			if ((data & 0x8000) && !external_host_access)
				tms34010_ICount = 0;
			cpunum_set_input_line(cpunum, INPUT_LINE_HALT, (data & 0x8000) ? ASSERT_LINE : CLEAR_LINE);

			/* NMI issued? */
			if (data & 0x0100)
				timer_call_after_resynch(NULL, cpunum, internal_interrupt_callback);
			break;

		case REG020_HSTCTLL:
			/* the TMS34010 can change MSGOUT, can set INTOUT, and can clear INTIN */
			if (!external_host_access)
			{
				newreg = (oldreg & 0xff8f) | (data & 0x0070);
				newreg |= data & 0x0080;
				newreg &= data | ~0x0008;
			}

			/* the host can change MSGIN, can set INTIN, and can clear INTOUT */
			else
			{
				newreg = (oldreg & 0xfff8) | (data & 0x0007);
				newreg &= data | ~0x0080;
				newreg |= data & 0x0008;
			}
			IOREG(offset) = newreg;

			/* the TMS34010 can set output interrupt? */
			if (!(oldreg & 0x0080) && (newreg & 0x0080))
			{
				if (state.config->output_int)
					(*state.config->output_int)(1);
			}
			else if ((oldreg & 0x0080) && !(newreg & 0x0080))
			{
				if (state.config->output_int)
					(*state.config->output_int)(0);
			}

			/* input interrupt? (should really be state-based, but the functions don't exist!) */
			if (!(oldreg & 0x0008) && (newreg & 0x0008))
				timer_call_after_resynch(NULL, cpunum | (TMS34010_HI << 8), internal_interrupt_callback);
			else if ((oldreg & 0x0008) && !(newreg & 0x0008))
				IOREG(REG020_INTPEND) &= ~TMS34010_HI;
			break;

		case REG020_INTENB:
			check_interrupt();
			break;

		case REG020_INTPEND:
			/* X1P, X2P and HIP are read-only */
			/* WVP and DIP can only have 0's written to them */
			IOREG(REG020_INTPEND) = oldreg;
			if (!(data & TMS34010_WV))
				IOREG(REG020_INTPEND) &= ~TMS34010_WV;
			if (!(data & TMS34010_DI))
				IOREG(REG020_INTPEND) &= ~TMS34010_DI;
			break;

		case REG020_CONVSP:
			if (data & 0x001f)
			{
				if (data & 0x1f00)
					state.convsp = (1 << (~data & 0x1f)) + (1 << (~(data >> 8) & 0x1f));
				else
					state.convsp = 1 << (~data & 0x1f);
			}
			else
				state.convsp = data;
			break;

		case REG020_CONVDP:
			if (data & 0x001f)
			{
				if (data & 0x1f00)
					state.convdp = (1 << (~data & 0x1f)) + (1 << (~(data >> 8) & 0x1f));
				else
					state.convdp = 1 << (~data & 0x1f);
			}
			else
				state.convdp = data;
			break;

		case REG020_CONVMP:
			if (data & 0x001f)
			{
				if (data & 0x1f00)
					state.convmp = (1 << (~data & 0x1f)) + (1 << (~(data >> 8) & 0x1f));
				else
					state.convmp = 1 << (~data & 0x1f);
			}
			else
				state.convmp = data;
			break;

		case REG020_DPYSTRT:
		case REG020_DPYADR:
		case REG020_DPYTAP:
			break;
	}
}



/***************************************************************************
    I/O REGISTER READS
***************************************************************************/

READ16_HANDLER( tms34010_io_register_r )
{
	int cpunum = cpu_getactivecpu();
	int result, total;

	if (LOG_CONTROL_REGS)
		logerror("CPU#%d@%08X: read %s\n", cpunum, activecpu_get_pc(), ioreg_name[offset]);

	switch (offset)
	{
		case REG_HCOUNT:
			/* scale the horizontal position from screen width to HTOTAL */
			result = video_screen_get_hpos(state.config->scrnum);
			total = IOREG(REG_HTOTAL) + 1;
			result = result * total / Machine->screen[state.config->scrnum].width;

			/* offset by the HBLANK end */
			result += IOREG(REG_HEBLNK);

			/* wrap around */
			if (result > total)
				result -= total;
			return result;

		case REG_REFCNT:
			return (activecpu_gettotalcycles() / 16) & 0xfffc;

		case REG_INTPEND:
			result = IOREG(offset);

			/* Cool Pool loops in mainline code on the appearance of the DI, even though they */
			/* have an IRQ handler. For this reason, we return it signalled a bit early in order */
			/* to make it past these loops. */
			if (SMART_IOREG(VCOUNT) + 1 == SMART_IOREG(DPYINT) &&
				attotime_compare(timer_timeleft(state.scantimer), ATTOTIME_IN_HZ(40000000/TMS34010_CLOCK_DIVIDER/3)) < 0)
				result |= TMS34010_DI;
			return result;
	}

	return IOREG(offset);
}


READ16_HANDLER( tms34020_io_register_r )
{
	int cpunum = cpu_getactivecpu();
	int result, total;

	if (LOG_CONTROL_REGS)
		logerror("CPU#%d@%08X: read %s\n", cpunum, activecpu_get_pc(), ioreg_name[offset]);

	switch (offset)
	{
		case REG020_HCOUNT:
			/* scale the horizontal position from screen width to HTOTAL */
			result = video_screen_get_hpos(state.config->scrnum);
			total = IOREG(REG020_HTOTAL) + 1;
			result = result * total / Machine->screen[state.config->scrnum].width;

			/* offset by the HBLANK end */
			result += IOREG(REG020_HEBLNK);

			/* wrap around */
			if (result > total)
				result -= total;
			return result;

		case REG020_REFADR:
		{
			int refreshrate = (IOREG(REG020_CONFIG) >> 8) & 7;
			if (refreshrate < 6)
				return (activecpu_gettotalcycles() / refreshrate) & 0xffff;
			break;
		}
	}

	return IOREG(offset);
}



/***************************************************************************
    UTILITY FUNCTIONS
***************************************************************************/

int tms34010_io_display_blanked(int cpu)
{
	int result;
	cpuintrf_push_context(cpu);
	result = !(IOREG(REG_DPYCTL) & 0x8000);
	cpuintrf_pop_context();
	return result;
}


int tms34020_io_display_blanked(int cpu)
{
	int result;
	cpuintrf_push_context(cpu);
	result = !(IOREG(REG020_DPYCTL) & 0x8000);
	cpuintrf_pop_context();
	return result;
}


int tms34010_get_DPYSTRT(int cpu)
{
	int result;
	cpuintrf_push_context(cpu);
	result = IOREG(REG_DPYSTRT);
	cpuintrf_pop_context();
	return result;
}


int tms34020_get_DPYSTRT(int cpu)
{
	int result;
	cpuintrf_push_context(cpu);
	result = (IOREG(REG020_DPYSTH) << 16) | (IOREG(REG020_DPYSTL) & ~0x1f);
	cpuintrf_pop_context();
	return result;
}



/***************************************************************************
    SAVE STATE
***************************************************************************/

static void tms34010_state_postload(void)
{
	change_pc(TOBYTE(PC));
	set_raster_op();
	set_pixel_function();
}


/***************************************************************************
    HOST INTERFACE WRITES
***************************************************************************/

void tms34010_host_w(int cpunum, int reg, int data)
{
	unsigned int addr;

	/* swap to the target cpu */
	cpuintrf_push_context(cpunum);

	switch (reg)
	{
		/* upper 16 bits of the address */
		case TMS34010_HOST_ADDRESS_H:
			IOREG(REG_HSTADRH) = data;
			break;

		/* lower 16 bits of the address */
		case TMS34010_HOST_ADDRESS_L:
			IOREG(REG_HSTADRL) = data;
			break;

		/* actual data */
		case TMS34010_HOST_DATA:

			/* write to the address */
			addr = (IOREG(REG_HSTADRH) << 16) | IOREG(REG_HSTADRL);
			TMS34010_WRMEM_WORD(TOBYTE(addr & 0xfffffff0), data);

			/* optional postincrement */
			if (IOREG(REG_HSTCTLH) & 0x0800)
			{
				addr += 0x10;
				IOREG(REG_HSTADRH) = addr >> 16;
				IOREG(REG_HSTADRL) = (UINT16)addr;
			}
			break;

		/* control register */
		case TMS34010_HOST_CONTROL:
			external_host_access = TRUE;
			tms34010_io_register_w(REG_HSTCTLH, data & 0xff00, 0);
			tms34010_io_register_w(REG_HSTCTLL, data & 0x00ff, 0);
			external_host_access = FALSE;
			break;

		/* error case */
		default:
			logerror("tms34010_host_control_w called on invalid register %d\n", reg);
			break;
	}

	/* swap back */
	cpuintrf_pop_context();
	activecpu_reset_banking();
}



/***************************************************************************
    HOST INTERFACE READS
***************************************************************************/

int tms34010_host_r(int cpunum, int reg)
{
	unsigned int addr;
	int result = 0;

	/* swap to the target cpu */
	cpuintrf_push_context(cpunum);

	switch (reg)
	{
		/* upper 16 bits of the address */
		case TMS34010_HOST_ADDRESS_H:
			result = IOREG(REG_HSTADRH);
			break;

		/* lower 16 bits of the address */
		case TMS34010_HOST_ADDRESS_L:
			result = IOREG(REG_HSTADRL);
			break;

		/* actual data */
		case TMS34010_HOST_DATA:

			/* read from the address */
			addr = (IOREG(REG_HSTADRH) << 16) | IOREG(REG_HSTADRL);
			result = TMS34010_RDMEM_WORD(TOBYTE(addr & 0xfffffff0));

			/* optional postincrement (it says preincrement, but data is preloaded, so it
               is effectively a postincrement */
			if (IOREG(REG_HSTCTLH) & 0x1000)
			{
				addr += 0x10;
				IOREG(REG_HSTADRH) = addr >> 16;
				IOREG(REG_HSTADRL) = (UINT16)addr;
			}
			break;

		/* control register */
		case TMS34010_HOST_CONTROL:
			result = (IOREG(REG_HSTCTLH) & 0xff00) | (IOREG(REG_HSTCTLL) & 0x00ff);
			break;

		/* error case */
		default:
			logerror("tms34010_host_control_r called on invalid register %d\n", reg);
			break;
	}

	/* swap back */
	cpuintrf_pop_context();
	activecpu_reset_banking();

	return result;
}



/**************************************************************************
 * Generic set_info
 **************************************************************************/

static void tms34010_set_info(UINT32 _state, cpuinfo *info)
{
	switch (_state)
	{
		/* --- the following bits of info are set as 64-bit signed integers --- */
		case CPUINFO_INT_INPUT_STATE + 0:				set_irq_line(0, info->i);				break;
		case CPUINFO_INT_INPUT_STATE + 1:				set_irq_line(1, info->i);				break;

		case CPUINFO_INT_PC:       						PC = info->i; change_pc(TOBYTE(PC));	break;
		case CPUINFO_INT_REGISTER + TMS34010_PC:		PC = info->i;							break;
		case CPUINFO_INT_SP:
		case CPUINFO_INT_REGISTER + TMS34010_SP:		SP = info->i;							break;
		case CPUINFO_INT_REGISTER + TMS34010_ST:		ST = info->i;							break;
		case CPUINFO_INT_REGISTER + TMS34010_A0:		AREG(0) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_A1:		AREG(1) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_A2:		AREG(2) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_A3:		AREG(3) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_A4:		AREG(4) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_A5:		AREG(5) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_A6:		AREG(6) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_A7:		AREG(7) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_A8:		AREG(8) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_A9:		AREG(9) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_A10:		AREG(10) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_A11:		AREG(11) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_A12:		AREG(12) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_A13:		AREG(13) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_A14:		AREG(14) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_B0:		BREG(0) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_B1:		BREG(1) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_B2:		BREG(2) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_B3:		BREG(3) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_B4:		BREG(4) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_B5:		BREG(5) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_B6:		BREG(6) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_B7:		BREG(7) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_B8:		BREG(8) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_B9:		BREG(9) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_B10:		BREG(10) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_B11:		BREG(11) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_B12:		BREG(12) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_B13:		BREG(13) = info->i;						break;
		case CPUINFO_INT_REGISTER + TMS34010_B14:		BREG(14) = info->i;						break;
	}
}



/**************************************************************************
 * Generic get_info
 **************************************************************************/

void tms34010_get_info(UINT32 _state, cpuinfo *info)
{
	switch (_state)
	{
		/* --- the following bits of info are returned as 64-bit signed integers --- */
		case CPUINFO_INT_CONTEXT_SIZE:					info->i = TMS34010_STATE_SIZE;			break;
		case CPUINFO_INT_INPUT_LINES:					info->i = 2;							break;
		case CPUINFO_INT_DEFAULT_IRQ_VECTOR:			info->i = 0;							break;
		case CPUINFO_INT_ENDIANNESS:					info->i = CPU_IS_LE;					break;
		case CPUINFO_INT_CLOCK_DIVIDER:					info->i = TMS34010_CLOCK_DIVIDER;		break;
		case CPUINFO_INT_MIN_INSTRUCTION_BYTES:			info->i = 2;							break;
		case CPUINFO_INT_MAX_INSTRUCTION_BYTES:			info->i = 10;							break;
		case CPUINFO_INT_MIN_CYCLES:					info->i = 1;							break;
		case CPUINFO_INT_MAX_CYCLES:					info->i = 10000;						break;

		case CPUINFO_INT_DATABUS_WIDTH + ADDRESS_SPACE_PROGRAM:	info->i = 16;					break;
		case CPUINFO_INT_ADDRBUS_WIDTH + ADDRESS_SPACE_PROGRAM: info->i = 32;					break;
		case CPUINFO_INT_ADDRBUS_SHIFT + ADDRESS_SPACE_PROGRAM: info->i = 3;					break;
		case CPUINFO_INT_DATABUS_WIDTH + ADDRESS_SPACE_DATA:	info->i = 0;					break;
		case CPUINFO_INT_ADDRBUS_WIDTH + ADDRESS_SPACE_DATA: 	info->i = 0;					break;
		case CPUINFO_INT_ADDRBUS_SHIFT + ADDRESS_SPACE_DATA: 	info->i = 0;					break;
		case CPUINFO_INT_DATABUS_WIDTH + ADDRESS_SPACE_IO:		info->i = 0;					break;
		case CPUINFO_INT_ADDRBUS_WIDTH + ADDRESS_SPACE_IO: 		info->i = 0;					break;
		case CPUINFO_INT_ADDRBUS_SHIFT + ADDRESS_SPACE_IO: 		info->i = 0;					break;

		case CPUINFO_INT_INPUT_STATE + 0:				info->i = (IOREG(REG_INTPEND) & TMS34010_INT1) ? ASSERT_LINE : CLEAR_LINE; break;
		case CPUINFO_INT_INPUT_STATE + 1:				info->i = (IOREG(REG_INTPEND) & TMS34010_INT2) ? ASSERT_LINE : CLEAR_LINE; break;

		case CPUINFO_INT_PREVIOUSPC:					/* not implemented */					break;

		case CPUINFO_INT_PC:
		case CPUINFO_INT_REGISTER + TMS34010_PC:		info->i = PC;							break;
		case CPUINFO_INT_SP:
		case CPUINFO_INT_REGISTER + TMS34010_SP:		info->i = SP;							break;
		case CPUINFO_INT_REGISTER + TMS34010_ST:		info->i = ST;							break;
		case CPUINFO_INT_REGISTER + TMS34010_A0:		info->i = AREG(0);						break;
		case CPUINFO_INT_REGISTER + TMS34010_A1:		info->i = AREG(1);						break;
		case CPUINFO_INT_REGISTER + TMS34010_A2:		info->i = AREG(2);						break;
		case CPUINFO_INT_REGISTER + TMS34010_A3:		info->i = AREG(3);						break;
		case CPUINFO_INT_REGISTER + TMS34010_A4:		info->i = AREG(4);						break;
		case CPUINFO_INT_REGISTER + TMS34010_A5:		info->i = AREG(5);						break;
		case CPUINFO_INT_REGISTER + TMS34010_A6:		info->i = AREG(6);						break;
		case CPUINFO_INT_REGISTER + TMS34010_A7:		info->i = AREG(7);						break;
		case CPUINFO_INT_REGISTER + TMS34010_A8:		info->i = AREG(8);						break;
		case CPUINFO_INT_REGISTER + TMS34010_A9:		info->i = AREG(9);						break;
		case CPUINFO_INT_REGISTER + TMS34010_A10:		info->i = AREG(10);						break;
		case CPUINFO_INT_REGISTER + TMS34010_A11:		info->i = AREG(11);						break;
		case CPUINFO_INT_REGISTER + TMS34010_A12:		info->i = AREG(12);						break;
		case CPUINFO_INT_REGISTER + TMS34010_A13:		info->i = AREG(13);						break;
		case CPUINFO_INT_REGISTER + TMS34010_A14:		info->i = AREG(14);						break;
		case CPUINFO_INT_REGISTER + TMS34010_B0:		info->i = BREG(0);						break;
		case CPUINFO_INT_REGISTER + TMS34010_B1:		info->i = BREG(1);						break;
		case CPUINFO_INT_REGISTER + TMS34010_B2:		info->i = BREG(2);						break;
		case CPUINFO_INT_REGISTER + TMS34010_B3:		info->i = BREG(3);						break;
		case CPUINFO_INT_REGISTER + TMS34010_B4:		info->i = BREG(4);						break;
		case CPUINFO_INT_REGISTER + TMS34010_B5:		info->i = BREG(5);						break;
		case CPUINFO_INT_REGISTER + TMS34010_B6:		info->i = BREG(6);						break;
		case CPUINFO_INT_REGISTER + TMS34010_B7:		info->i = BREG(7);						break;
		case CPUINFO_INT_REGISTER + TMS34010_B8:		info->i = BREG(8);						break;
		case CPUINFO_INT_REGISTER + TMS34010_B9:		info->i = BREG(9);						break;
		case CPUINFO_INT_REGISTER + TMS34010_B10:		info->i = BREG(10);						break;
		case CPUINFO_INT_REGISTER + TMS34010_B11:		info->i = BREG(11);						break;
		case CPUINFO_INT_REGISTER + TMS34010_B12:		info->i = BREG(12);						break;
		case CPUINFO_INT_REGISTER + TMS34010_B13:		info->i = BREG(13);						break;
		case CPUINFO_INT_REGISTER + TMS34010_B14:		info->i = BREG(14);						break;

		/* --- the following bits of info are returned as pointers to data or functions --- */
		case CPUINFO_PTR_SET_INFO:						info->setinfo = tms34010_set_info;		break;
		case CPUINFO_PTR_GET_CONTEXT:					info->getcontext = tms34010_get_context; break;
		case CPUINFO_PTR_SET_CONTEXT:					info->setcontext = tms34010_set_context; break;
		case CPUINFO_PTR_INIT:							info->init = tms34010_init;				break;
		case CPUINFO_PTR_RESET:							info->reset = tms34010_reset;			break;
		case CPUINFO_PTR_EXIT:							info->exit = tms34010_exit;				break;
		case CPUINFO_PTR_EXECUTE:						info->execute = tms34010_execute;		break;
		case CPUINFO_PTR_BURN:							info->burn = NULL;						break;
#ifdef MAME_DEBUG
		case CPUINFO_PTR_DISASSEMBLE:					info->disassemble = tms34010_dasm;		break;
#endif /* MAME_DEBUG */
		case CPUINFO_PTR_INSTRUCTION_COUNTER:			info->icount = &tms34010_ICount;		break;

		/* --- the following bits of info are returned as NULL-terminated strings --- */
		case CPUINFO_STR_NAME:							strcpy(info->s, "TMS34010");			break;
		case CPUINFO_STR_CORE_FAMILY:					strcpy(info->s, "Texas Instruments 340x0"); break;
		case CPUINFO_STR_CORE_VERSION:					strcpy(info->s, "1.0");					break;
		case CPUINFO_STR_CORE_FILE:						strcpy(info->s, __FILE__);				break;
		case CPUINFO_STR_CORE_CREDITS:					strcpy(info->s, "Copyright (C) Alex Pasadyn/Zsolt Vasvari 1998\nParts based on code by Aaron Giles"); break;

		case CPUINFO_STR_FLAGS:
			sprintf(info->s, "%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c",
				state.st & 0x80000000 ? 'N':'.',
				state.st & 0x40000000 ? 'C':'.',
				state.st & 0x20000000 ? 'Z':'.',
				state.st & 0x10000000 ? 'V':'.',
				state.st & 0x02000000 ? 'P':'.',
				state.st & 0x00200000 ? 'I':'.',
				state.st & 0x00000800 ? 'E':'.',
				state.st & 0x00000400 ? 'F':'.',
				state.st & 0x00000200 ? 'F':'.',
				state.st & 0x00000100 ? 'F':'.',
				state.st & 0x00000080 ? 'F':'.',
				state.st & 0x00000040 ? 'F':'.',
				state.st & 0x00000020 ? 'E':'.',
				state.st & 0x00000010 ? 'F':'.',
				state.st & 0x00000008 ? 'F':'.',
				state.st & 0x00000004 ? 'F':'.',
				state.st & 0x00000002 ? 'F':'.',
				state.st & 0x00000001 ? 'F':'.');
			break;

		case CPUINFO_STR_REGISTER + TMS34010_PC:		sprintf(info->s, "PC :%08X", state.pc); break;
		case CPUINFO_STR_REGISTER + TMS34010_SP:		sprintf(info->s, "SP :%08X", AREG(15)); break;
		case CPUINFO_STR_REGISTER + TMS34010_ST:		sprintf(info->s, "ST :%08X", state.st); break;
		case CPUINFO_STR_REGISTER + TMS34010_A0:		sprintf(info->s, "A0 :%08X", AREG( 0)); break;
		case CPUINFO_STR_REGISTER + TMS34010_A1:		sprintf(info->s, "A1 :%08X", AREG( 1)); break;
		case CPUINFO_STR_REGISTER + TMS34010_A2:		sprintf(info->s, "A2 :%08X", AREG( 2)); break;
		case CPUINFO_STR_REGISTER + TMS34010_A3:		sprintf(info->s, "A3 :%08X", AREG( 3)); break;
		case CPUINFO_STR_REGISTER + TMS34010_A4:		sprintf(info->s, "A4 :%08X", AREG( 4)); break;
		case CPUINFO_STR_REGISTER + TMS34010_A5:		sprintf(info->s, "A5 :%08X", AREG( 5)); break;
		case CPUINFO_STR_REGISTER + TMS34010_A6:		sprintf(info->s, "A6 :%08X", AREG( 6)); break;
		case CPUINFO_STR_REGISTER + TMS34010_A7:		sprintf(info->s, "A7 :%08X", AREG( 7)); break;
		case CPUINFO_STR_REGISTER + TMS34010_A8:		sprintf(info->s, "A8 :%08X", AREG( 8)); break;
		case CPUINFO_STR_REGISTER + TMS34010_A9:		sprintf(info->s, "A9 :%08X", AREG( 9)); break;
		case CPUINFO_STR_REGISTER + TMS34010_A10:		sprintf(info->s,"A10:%08X", AREG(10)); break;
		case CPUINFO_STR_REGISTER + TMS34010_A11:		sprintf(info->s,"A11:%08X", AREG(11)); break;
		case CPUINFO_STR_REGISTER + TMS34010_A12:		sprintf(info->s,"A12:%08X", AREG(12)); break;
		case CPUINFO_STR_REGISTER + TMS34010_A13:		sprintf(info->s,"A13:%08X", AREG(13)); break;
		case CPUINFO_STR_REGISTER + TMS34010_A14:		sprintf(info->s,"A14:%08X", AREG(14)); break;
		case CPUINFO_STR_REGISTER + TMS34010_B0:		sprintf(info->s, "B0 :%08X", BREG( 0)); break;
		case CPUINFO_STR_REGISTER + TMS34010_B1:		sprintf(info->s, "B1 :%08X", BREG( 1)); break;
		case CPUINFO_STR_REGISTER + TMS34010_B2:		sprintf(info->s, "B2 :%08X", BREG( 2)); break;
		case CPUINFO_STR_REGISTER + TMS34010_B3:		sprintf(info->s, "B3 :%08X", BREG( 3)); break;
		case CPUINFO_STR_REGISTER + TMS34010_B4:		sprintf(info->s, "B4 :%08X", BREG( 4)); break;
		case CPUINFO_STR_REGISTER + TMS34010_B5:		sprintf(info->s, "B5 :%08X", BREG( 5)); break;
		case CPUINFO_STR_REGISTER + TMS34010_B6:		sprintf(info->s, "B6 :%08X", BREG( 6)); break;
		case CPUINFO_STR_REGISTER + TMS34010_B7:		sprintf(info->s, "B7 :%08X", BREG( 7)); break;
		case CPUINFO_STR_REGISTER + TMS34010_B8:		sprintf(info->s, "B8 :%08X", BREG( 8)); break;
		case CPUINFO_STR_REGISTER + TMS34010_B9:		sprintf(info->s, "B9 :%08X", BREG( 9)); break;
		case CPUINFO_STR_REGISTER + TMS34010_B10:		sprintf(info->s,"B10:%08X", BREG(10)); break;
		case CPUINFO_STR_REGISTER + TMS34010_B11:		sprintf(info->s,"B11:%08X", BREG(11)); break;
		case CPUINFO_STR_REGISTER + TMS34010_B12:		sprintf(info->s,"B12:%08X", BREG(12)); break;
		case CPUINFO_STR_REGISTER + TMS34010_B13:		sprintf(info->s,"B13:%08X", BREG(13)); break;
		case CPUINFO_STR_REGISTER + TMS34010_B14:		sprintf(info->s,"B14:%08X", BREG(14)); break;
	}
}


#if (HAS_TMS34020)
/**************************************************************************
 * CPU-specific set_info
 **************************************************************************/

void tms34020_get_info(UINT32 _state, cpuinfo *info)
{
	switch (_state)
	{
		/* --- the following bits of info are returned as 64-bit signed integers --- */
		case CPUINFO_INT_CONTEXT_SIZE:					info->i = TMS34020_STATE_SIZE;			break;
		case CPUINFO_INT_CLOCK_DIVIDER:					info->i = TMS34020_CLOCK_DIVIDER;		break;

		/* --- the following bits of info are returned as pointers to data or functions --- */
		case CPUINFO_PTR_GET_CONTEXT:					info->getcontext = tms34020_get_context; break;
		case CPUINFO_PTR_SET_CONTEXT:					info->setcontext = tms34020_set_context; break;
		case CPUINFO_PTR_RESET:							info->reset = tms34020_reset;			break;
#ifdef MAME_DEBUG
		case CPUINFO_PTR_DISASSEMBLE:					info->disassemble = tms34020_dasm;		break;
#endif /* MAME_DEBUG */

		/* --- the following bits of info are returned as NULL-terminated strings --- */
		case CPUINFO_STR_NAME:							strcpy(info->s, "TMS34020");			break;

		default:										tms34010_get_info(_state, info);		break;
	}
}
#endif
