
static void sc61860_instruction(void)
{
	int oper=READ_OP();
	if ((oper&0xc0)==0x80) {
		sc61860_load_imm_p(oper&0x3f);sc61860_ICount-=2;
	} else if ((oper&0xe0)==0xe0) {
		sc61860_call(READ_OP()|((oper&0x1f)<<8));sc61860_ICount-=7;
	} else {
		switch(oper) {
		case 0: sc61860_load_imm(I, READ_OP());sc61860_ICount-=4;break;
		case 1: sc61860_load_imm(J, READ_OP());sc61860_ICount-=4;break;
		case 2: sc61860_load_imm(A, READ_OP());sc61860_ICount-=4;break;
		case 3: sc61860_load_imm(B, READ_OP());sc61860_ICount-=4;break;
		case 4: sc61860_inc_load_dp(XL);sc61860_ICount-=6;break;
		case 5: sc61860_dec_load_dp(XL);sc61860_ICount-=6;break;
		case 6: sc61860_inc_load_dp(YL);sc61860_ICount-=6;break;
		case 7: sc61860_dec_load_dp(YL);sc61860_ICount-=6;break;
		case 8: sc61860_copy(sc61860.ram[I]);break;
		case 9: sc61860_exchange(sc61860.ram[I]);break;
		case 10: sc61860_copy(sc61860.ram[J]);break;
		case 11: sc61860_exchange(sc61860.ram[J]);break;
		case 12: sc61860_add_bcd_a();sc61860_ICount-=7;break;
		case 13: sc61860_sub_bcd_a();sc61860_ICount-=7;break;
		case 14: sc61860_add_bcd();sc61860_ICount-=7;break;
		case 15: sc61860_sub_bcd();sc61860_ICount-=7;break;
		case 16: sc61860_load_dp();sc61860_ICount-=8;break;
		case 17: sc61860_load_dl();sc61860_ICount-=5;break;
		case 18: sc61860_load_imm_p(READ_OP());sc61860_ICount-=4;break;
		case 19: sc61860_load_imm_q(READ_OP());sc61860_ICount-=4;break;
		case 20: sc61860_add_word();sc61860_ICount-=5;break;
		case 21: sc61860_sub_word();sc61860_ICount-=5;break;
		case 24: sc61860_copy_ext(sc61860.ram[I]);break;
		case 25: sc61860_exchange_ext(sc61860.ram[I]);break;
		case 26: sc61860_copy_ext(sc61860.ram[J]);break;
		case 27: sc61860_exchange_ext(sc61860.ram[J]);break;
		case 28: sc61860_shift_right_nibble();sc61860_ICount-=5;break;
		case 29: sc61860_shift_left_nibble();sc61860_ICount-=5;break;
		case 30: sc61860_fill();sc61860_ICount-=5;break;
		case 31: sc61860_fill_ext();sc61860_ICount-=4;break;
		case 32: sc61860_store_p();sc61860_ICount-=2;break;
		case 33: sc61860_store_q();sc61860_ICount-=2;break;
		case 34: sc61860_store_r();sc61860_ICount-=2;break;
		case 36: sc61860_inc_load_dp_load();sc61860_ICount-=7;break;
		case 37: sc61860_dec_load_dp_load();sc61860_ICount-=7;break;
		case 38: sc61860_inc_load_dp_store();sc61860_ICount-=7;break;
		case 39: sc61860_dec_load_dp_store();sc61860_ICount-=7;break;
		case 40: sc61860_jump_rel_plus(!sc61860.zero);sc61860_ICount-=4;break;
		case 41: sc61860_jump_rel_minus(!sc61860.zero);sc61860_ICount-=4;break;
		case 42: sc61860_jump_rel_plus(!sc61860.carry);sc61860_ICount-=4;break;
		case 43: sc61860_jump_rel_minus(!sc61860.carry);sc61860_ICount-=4;break;
		case 44: sc61860_jump_rel_plus(TRUE);sc61860_ICount-=4;break;
		case 45: sc61860_jump_rel_minus(TRUE);sc61860_ICount-=4;break;
		case 47: sc61860_loop();sc61860_ICount-=7;break;
		case 48: sc61860_load_imm_p(sc61860.ram[A]);sc61860_ICount-=2;break;
		case 49: sc61860_load_imm_q(sc61860.ram[A]);sc61860_ICount-=2;break;
		case 50: sc61860_load_r();sc61860_ICount-=2;break;
		case 52: sc61860_push();sc61860_ICount-=3;break;
		case 53: sc61860_copy_int(sc61860.ram[I]);break;
		case 55: sc61860_return();sc61860_ICount-=4;break;
		case 56: sc61860_jump_rel_plus(sc61860.zero);sc61860_ICount-=4;break;
		case 57: sc61860_jump_rel_minus(sc61860.zero);sc61860_ICount-=4;break;
		case 58: sc61860_jump_rel_plus(sc61860.carry);sc61860_ICount-=4;break;
		case 59: sc61860_jump_rel_minus(sc61860.carry);sc61860_ICount-=4;break;
		case 64: sc61860_inc(I);sc61860_ICount-=4;break;
		case 65: sc61860_dec(I);sc61860_ICount-=4;break;
		case 66: sc61860_inc(A);sc61860_ICount-=4;break;
		case 67: sc61860_dec(A);sc61860_ICount-=4;break;
		case 68: sc61860_add(sc61860.p,sc61860.ram[A]);sc61860_ICount-=3;break;
		case 69: sc61860_sub(sc61860.p,sc61860.ram[A]);sc61860_ICount-=3;break;
		case 70: sc61860_and(sc61860.p,sc61860.ram[A]);sc61860_ICount-=3;break;
		case 71: sc61860_or(sc61860.p,sc61860.ram[A]);sc61860_ICount-=3;break;
		case 72: sc61860_inc(K);sc61860_ICount-=4;break;
		case 73: sc61860_dec(K);sc61860_ICount-=4;break;
		case 74: sc61860_inc(V);sc61860_ICount-=4;break;
		case 75: sc61860_dec(V);sc61860_ICount-=4;break;
		case 76: sc61860_in_a();sc61860_ICount-=2;break;
		case 77: /*nopw*/;sc61860_ICount-=2;break;
		case 78: sc61860_wait();sc61860_ICount-=6;break;
		case 79: sc61860_wait_x(FALSE);sc61860_ICount-=1;break;
		case 80: sc61860_inc_p();sc61860_ICount-=2;break;
		case 81: sc61860_dec_p();sc61860_ICount-=2;break;
		case 82: sc61860_store_ext(A);sc61860_ICount-=2;break;
		case 83: sc61860_store_ext(sc61860.p);sc61860_ICount-=2;break;
		case 84: sc61860_load_imm(sc61860.p, READ_OP());sc61860_ICount-=3/*?*/;break; // undocumented
		case 85: sc61860_load_ext(sc61860.p);sc61860_ICount-=3;break;
		case 86: sc61860_load_imm(sc61860.p, READ_OP());sc61860_ICount-=3/*?*/;break; // undocumented
		case 87: sc61860_load_ext(A);sc61860_ICount-=3;break;
		case 88: sc61860_swap();sc61860_ICount-=2;break;
		case 89: sc61860_load();sc61860_ICount-=2;break;
		case 90: sc61860_rotate_left();sc61860_ICount-=2;break;
		case 91: sc61860_pop();sc61860_ICount-=2;break;
		case 93: sc61860_out_a();sc61860_ICount-=3;break;
		case 95: sc61860_out_f();sc61860_ICount-=3;break;
		case 96: sc61860_and(sc61860.p,READ_OP());sc61860_ICount-=4;break;
		case 97: sc61860_or(sc61860.p,READ_OP());sc61860_ICount-=4;break;
		case 98: sc61860_test(sc61860.p,READ_OP());sc61860_ICount-=4;break;
		case 99: sc61860_cmp(sc61860.p,READ_OP());sc61860_ICount-=4;break;
		case 100: sc61860_and(A,READ_OP());sc61860_ICount-=4;break;
		case 101: sc61860_or(A,READ_OP());sc61860_ICount-=4;break;
		case 102: sc61860_test(A,READ_OP());sc61860_ICount-=4;break;
		case 103: sc61860_cmp(A,READ_OP());sc61860_ICount-=4;break;
		case 105: sc61860_execute_table_call();sc61860_ICount-=3;break;
		case 107: sc61860_test_special();sc61860_ICount-=4;break;
		case 111: sc61860_wait_x(TRUE);sc61860_ICount-=1;break;
		case 112: sc61860_add(sc61860.p,READ_OP());sc61860_ICount-=4;break;
		case 113: sc61860_sub(sc61860.p,READ_OP());sc61860_ICount-=4;break;
		case 116: sc61860_add(A,READ_OP());sc61860_ICount-=4;break;
		case 117: sc61860_sub(A,READ_OP());sc61860_ICount-=4;break;
		case 120: sc61860_call(READ_OP_ARG_WORD());sc61860_ICount-=8;break;
		case 121: sc61860_jump(1);sc61860_ICount-=6;break;
		case 122: sc61860_prepare_table_call();sc61860_ICount-=9;break;
		case 124: sc61860_jump(!sc61860.zero);sc61860_ICount-=6;break;
		case 125: sc61860_jump(!sc61860.carry);sc61860_ICount-=6;break;
		case 126: sc61860_jump(sc61860.zero);sc61860_ICount-=6;break;
		case 127: sc61860_jump(sc61860.carry);sc61860_ICount-=6;break;
		case 192: sc61860_inc(J);sc61860_ICount-=4;break;
		case 193: sc61860_dec(J);sc61860_ICount-=4;break;
		case 194: sc61860_inc(B);sc61860_ICount-=4;break;
		case 195: sc61860_dec(B);sc61860_ICount-=4;break;
		case 196: sc61860_add_carry();sc61860_ICount-=3;break;
		case 197: sc61860_sub_carry();sc61860_ICount-=3;break;
		case 199: sc61860_cmp(sc61860.p,sc61860.ram[A]);sc61860_ICount-=3;break;
		case 200: sc61860_inc(L);sc61860_ICount-=4;break;
		case 201: sc61860_dec(L);sc61860_ICount-=4;break;
		case 202: sc61860_inc(W);sc61860_ICount-=4;break;
		case 203: sc61860_dec(W);sc61860_ICount-=4;break;
		case 204: sc61860_in_b();sc61860_ICount-=2;break;
		case 206: /*nopt*/;sc61860_ICount-=3;break;
		case 208: sc61860_set_carry();sc61860_ICount-=2;break;
		case 209: sc61860_reset_carry();sc61860_ICount-=4;break;
		case 210: sc61860_rotate_right();sc61860_ICount-=2;break;
		case 212: sc61860_and_ext();sc61860_ICount-=6;break;
		case 213: sc61860_or_ext();sc61860_ICount-=6;break;
		case 214: sc61860_test_ext();sc61860_ICount-=6;break;
		case 216: sc61860_leave();sc61860_ICount-=2;break;
		case 218: sc61860_exam(A, B);sc61860_ICount-=3;break;
		case 219: sc61860_exam(A, sc61860.p);sc61860_ICount-=3;break;
		case 221: sc61860_out_b();sc61860_ICount-=2;break;
		case 223: sc61860_out_c();sc61860_ICount-=2;break;
		default: logerror("sc61860 illegal opcode at %.4x %.2x\n",sc61860.pc-1, oper);
		}
	}
}
