Пример #1
0
/* execute instructions on this CPU until icount expires */
static int hd6309_execute(int cycles)	/* NS 970908 */
{
	hd6309_ICount = cycles - hd6309.extra_cycles;
	hd6309.extra_cycles = 0;

	if (hd6309.int_state & (HD6309_CWAI | HD6309_SYNC))
	{
		CALL_MAME_DEBUG;
		hd6309_ICount = 0;
	}
	else
	{
		do
		{
			pPPC = pPC;

			CALL_MAME_DEBUG;

			hd6309.ireg = ROP(PCD);
			PC++;

#ifdef BIG_SWITCH
			switch( hd6309.ireg )
			{
			case 0x00: neg_di();   				break;
			case 0x01: oim_di();   				break;
			case 0x02: aim_di();   				break;
			case 0x03: com_di();   				break;
			case 0x04: lsr_di();   				break;
			case 0x05: eim_di();   				break;
			case 0x06: ror_di();   				break;
			case 0x07: asr_di();   				break;
			case 0x08: asl_di();   				break;
			case 0x09: rol_di();   				break;
			case 0x0a: dec_di();   				break;
			case 0x0b: tim_di();   				break;
			case 0x0c: inc_di();   				break;
			case 0x0d: tst_di();   				break;
			case 0x0e: jmp_di();   				break;
			case 0x0f: clr_di();   				break;
			case 0x10: pref10();				break;
			case 0x11: pref11();				break;
			case 0x12: nop();	   				break;
			case 0x13: sync();	   				break;
			case 0x14: sexw();	   				break;
			case 0x15: IIError();				break;
			case 0x16: lbra();	   				break;
			case 0x17: lbsr();	   				break;
			case 0x18: IIError();				break;
			case 0x19: daa();	   				break;
			case 0x1a: orcc();	   				break;
			case 0x1b: IIError();				break;
			case 0x1c: andcc();    				break;
			case 0x1d: sex();	   				break;
			case 0x1e: exg();	   				break;
			case 0x1f: tfr();	   				break;
			case 0x20: bra();	   				break;
			case 0x21: brn();	   				break;
			case 0x22: bhi();	   				break;
			case 0x23: bls();	   				break;
			case 0x24: bcc();	   				break;
			case 0x25: bcs();	   				break;
			case 0x26: bne();	   				break;
			case 0x27: beq();	   				break;
			case 0x28: bvc();	   				break;
			case 0x29: bvs();	   				break;
			case 0x2a: bpl();	   				break;
			case 0x2b: bmi();	   				break;
			case 0x2c: bge();	   				break;
			case 0x2d: blt();	   				break;
			case 0x2e: bgt();	   				break;
			case 0x2f: ble();	   				break;
			case 0x30: leax();	   				break;
			case 0x31: leay();	   				break;
			case 0x32: leas();	   				break;
			case 0x33: leau();	   				break;
			case 0x34: pshs();	   				break;
			case 0x35: puls();	   				break;
			case 0x36: pshu();	   				break;
			case 0x37: pulu();	   				break;
			case 0x38: IIError();				break;
			case 0x39: rts();	   				break;
			case 0x3a: abx();	   				break;
			case 0x3b: rti();	   				break;
			case 0x3c: cwai();					break;
			case 0x3d: mul();					break;
			case 0x3e: IIError();				break;
			case 0x3f: swi();					break;
			case 0x40: nega();	   				break;
			case 0x41: IIError();				break;
			case 0x42: IIError();				break;
			case 0x43: coma();	   				break;
			case 0x44: lsra();	   				break;
			case 0x45: IIError();				break;
			case 0x46: rora();	   				break;
			case 0x47: asra();	   				break;
			case 0x48: asla();	   				break;
			case 0x49: rola();	   				break;
			case 0x4a: deca();	   				break;
			case 0x4b: IIError();				break;
			case 0x4c: inca();	   				break;
			case 0x4d: tsta();	   				break;
			case 0x4e: IIError();				break;
			case 0x4f: clra();	   				break;
			case 0x50: negb();	   				break;
			case 0x51: IIError();				break;
			case 0x52: IIError();				break;
			case 0x53: comb();	   				break;
			case 0x54: lsrb();	   				break;
			case 0x55: IIError();				break;
			case 0x56: rorb();	   				break;
			case 0x57: asrb();	   				break;
			case 0x58: aslb();	   				break;
			case 0x59: rolb();	   				break;
			case 0x5a: decb();	   				break;
			case 0x5b: IIError();				break;
			case 0x5c: incb();	   				break;
			case 0x5d: tstb();	   				break;
			case 0x5e: IIError();				break;
			case 0x5f: clrb();	   				break;
			case 0x60: neg_ix();   				break;
			case 0x61: oim_ix();   				break;
			case 0x62: aim_ix();   				break;
			case 0x63: com_ix();   				break;
			case 0x64: lsr_ix();   				break;
			case 0x65: eim_ix();   				break;
			case 0x66: ror_ix();   				break;
			case 0x67: asr_ix();   				break;
			case 0x68: asl_ix();   				break;
			case 0x69: rol_ix();   				break;
			case 0x6a: dec_ix();   				break;
			case 0x6b: tim_ix();   				break;
			case 0x6c: inc_ix();   				break;
			case 0x6d: tst_ix();   				break;
			case 0x6e: jmp_ix();   				break;
			case 0x6f: clr_ix();   				break;
			case 0x70: neg_ex();   				break;
			case 0x71: oim_ex();   				break;
			case 0x72: aim_ex();   				break;
			case 0x73: com_ex();   				break;
			case 0x74: lsr_ex();   				break;
			case 0x75: eim_ex();   				break;
			case 0x76: ror_ex();   				break;
			case 0x77: asr_ex();   				break;
			case 0x78: asl_ex();   				break;
			case 0x79: rol_ex();   				break;
			case 0x7a: dec_ex();   				break;
			case 0x7b: tim_ex();   				break;
			case 0x7c: inc_ex();   				break;
			case 0x7d: tst_ex();   				break;
			case 0x7e: jmp_ex();   				break;
			case 0x7f: clr_ex();   				break;
			case 0x80: suba_im();  				break;
			case 0x81: cmpa_im();  				break;
			case 0x82: sbca_im();  				break;
			case 0x83: subd_im();  				break;
			case 0x84: anda_im();  				break;
			case 0x85: bita_im();  				break;
			case 0x86: lda_im();   				break;
			case 0x87: IIError(); 				break;
			case 0x88: eora_im();  				break;
			case 0x89: adca_im();  				break;
			case 0x8a: ora_im();   				break;
			case 0x8b: adda_im();  				break;
			case 0x8c: cmpx_im();  				break;
			case 0x8d: bsr();	   				break;
			case 0x8e: ldx_im();   				break;
			case 0x8f: IIError();  				break;
			case 0x90: suba_di();  				break;
			case 0x91: cmpa_di();  				break;
			case 0x92: sbca_di();  				break;
			case 0x93: subd_di();  				break;
			case 0x94: anda_di();  				break;
			case 0x95: bita_di();  				break;
			case 0x96: lda_di();   				break;
			case 0x97: sta_di();   				break;
			case 0x98: eora_di();  				break;
			case 0x99: adca_di();  				break;
			case 0x9a: ora_di();   				break;
			case 0x9b: adda_di();  				break;
			case 0x9c: cmpx_di();  				break;
			case 0x9d: jsr_di();   				break;
			case 0x9e: ldx_di();   				break;
			case 0x9f: stx_di();   				break;
			case 0xa0: suba_ix();  				break;
			case 0xa1: cmpa_ix();  				break;
			case 0xa2: sbca_ix();  				break;
			case 0xa3: subd_ix();  				break;
			case 0xa4: anda_ix();  				break;
			case 0xa5: bita_ix();  				break;
			case 0xa6: lda_ix();   				break;
			case 0xa7: sta_ix();   				break;
			case 0xa8: eora_ix();  				break;
			case 0xa9: adca_ix();  				break;
			case 0xaa: ora_ix();   				break;
			case 0xab: adda_ix();  				break;
			case 0xac: cmpx_ix();  				break;
			case 0xad: jsr_ix();   				break;
			case 0xae: ldx_ix();   				break;
			case 0xaf: stx_ix();   				break;
			case 0xb0: suba_ex();  				break;
			case 0xb1: cmpa_ex();  				break;
			case 0xb2: sbca_ex();  				break;
			case 0xb3: subd_ex();  				break;
			case 0xb4: anda_ex();  				break;
			case 0xb5: bita_ex();  				break;
			case 0xb6: lda_ex();   				break;
			case 0xb7: sta_ex();   				break;
			case 0xb8: eora_ex();  				break;
			case 0xb9: adca_ex();  				break;
			case 0xba: ora_ex();   				break;
			case 0xbb: adda_ex();  				break;
			case 0xbc: cmpx_ex();  				break;
			case 0xbd: jsr_ex();   				break;
			case 0xbe: ldx_ex();   				break;
			case 0xbf: stx_ex();   				break;
			case 0xc0: subb_im();  				break;
			case 0xc1: cmpb_im();  				break;
			case 0xc2: sbcb_im();  				break;
			case 0xc3: addd_im();  				break;
			case 0xc4: andb_im();  				break;
			case 0xc5: bitb_im();  				break;
			case 0xc6: ldb_im();   				break;
			case 0xc7: IIError(); 				break;
			case 0xc8: eorb_im();  				break;
			case 0xc9: adcb_im();  				break;
			case 0xca: orb_im();   				break;
			case 0xcb: addb_im();  				break;
			case 0xcc: ldd_im();   				break;
			case 0xcd: ldq_im();   				break; /* in m6809 was std_im */
			case 0xce: ldu_im();   				break;
			case 0xcf: IIError();  				break;
			case 0xd0: subb_di();  				break;
			case 0xd1: cmpb_di();  				break;
			case 0xd2: sbcb_di();  				break;
			case 0xd3: addd_di();  				break;
			case 0xd4: andb_di();  				break;
			case 0xd5: bitb_di();  				break;
			case 0xd6: ldb_di();   				break;
			case 0xd7: stb_di();   				break;
			case 0xd8: eorb_di();  				break;
			case 0xd9: adcb_di();  				break;
			case 0xda: orb_di();   				break;
			case 0xdb: addb_di();  				break;
			case 0xdc: ldd_di();   				break;
			case 0xdd: std_di();   				break;
			case 0xde: ldu_di();   				break;
			case 0xdf: stu_di();   				break;
			case 0xe0: subb_ix();  				break;
			case 0xe1: cmpb_ix();  				break;
			case 0xe2: sbcb_ix();  				break;
			case 0xe3: addd_ix();  				break;
			case 0xe4: andb_ix();  				break;
			case 0xe5: bitb_ix();  				break;
			case 0xe6: ldb_ix();   				break;
			case 0xe7: stb_ix();   				break;
			case 0xe8: eorb_ix();  				break;
			case 0xe9: adcb_ix();  				break;
			case 0xea: orb_ix();   				break;
			case 0xeb: addb_ix();  				break;
			case 0xec: ldd_ix();   				break;
			case 0xed: std_ix();   				break;
			case 0xee: ldu_ix();   				break;
			case 0xef: stu_ix();   				break;
			case 0xf0: subb_ex();  				break;
			case 0xf1: cmpb_ex();  				break;
			case 0xf2: sbcb_ex();  				break;
			case 0xf3: addd_ex();  				break;
			case 0xf4: andb_ex();  				break;
			case 0xf5: bitb_ex();  				break;
			case 0xf6: ldb_ex();   				break;
			case 0xf7: stb_ex();   				break;
			case 0xf8: eorb_ex();  				break;
			case 0xf9: adcb_ex();  				break;
			case 0xfa: orb_ex();   				break;
			case 0xfb: addb_ex();  				break;
			case 0xfc: ldd_ex();   				break;
			case 0xfd: std_ex();   				break;
			case 0xfe: ldu_ex();   				break;
			case 0xff: stu_ex();   				break;
			}
#else
			(*hd6309_main[hd6309.ireg])();
#endif    /* BIG_SWITCH */

			hd6309_ICount -= cycle_counts_page0[hd6309.ireg];

		} while( hd6309_ICount > 0 );

		hd6309_ICount -= hd6309.extra_cycles;
		hd6309.extra_cycles = 0;
	}

	return cycles - hd6309_ICount;	 /* NS 970908 */
}
Пример #2
0
/* execute instructions on this CPU until icount expires */
static CPU_EXECUTE( m6809 )	/* NS 970908 */
{
	m68_state_t *m68_state = get_safe_token(device);

    m68_state->icount = cycles - m68_state->extra_cycles;
	m68_state->extra_cycles = 0;

	check_irq_lines(m68_state);

	if (m68_state->int_state & (M6809_CWAI | M6809_SYNC))
	{
		debugger_instruction_hook(device, PCD);
		m68_state->icount = 0;
	}
	else
	{
		do
		{
			pPPC = pPC;

			debugger_instruction_hook(device, PCD);

			m68_state->ireg = ROP(PCD);
			PC++;
#if BIG_SWITCH
            switch( m68_state->ireg )
			{
			case 0x00: neg_di(m68_state);    break;
			case 0x01: neg_di(m68_state);    break;	/* undocumented */
			case 0x02: IIError(m68_state);   break;
			case 0x03: com_di(m68_state);    break;
			case 0x04: lsr_di(m68_state);    break;
			case 0x05: IIError(m68_state);   break;
			case 0x06: ror_di(m68_state);    break;
			case 0x07: asr_di(m68_state);    break;
			case 0x08: asl_di(m68_state);    break;
			case 0x09: rol_di(m68_state);    break;
			case 0x0a: dec_di(m68_state);    break;
			case 0x0b: IIError(m68_state);   break;
			case 0x0c: inc_di(m68_state);    break;
			case 0x0d: tst_di(m68_state);    break;
			case 0x0e: jmp_di(m68_state);    break;
			case 0x0f: clr_di(m68_state);    break;
			case 0x10: pref10(m68_state);					 break;
			case 0x11: pref11(m68_state);					 break;
			case 0x12: nop(m68_state);	    break;
			case 0x13: sync(m68_state);	    break;
			case 0x14: IIError(m68_state);   break;
			case 0x15: IIError(m68_state);   break;
			case 0x16: lbra(m68_state);	    break;
			case 0x17: lbsr(m68_state);	    break;
			case 0x18: IIError(m68_state);   break;
			case 0x19: daa(m68_state);	    break;
			case 0x1a: orcc(m68_state);	    break;
			case 0x1b: IIError(m68_state);   break;
			case 0x1c: andcc(m68_state);     break;
			case 0x1d: sex(m68_state);	    break;
			case 0x1e: exg(m68_state);	    break;
			case 0x1f: tfr(m68_state);	    break;
			case 0x20: bra(m68_state);	    break;
			case 0x21: brn(m68_state);	    break;
			case 0x22: bhi(m68_state);	    break;
			case 0x23: bls(m68_state);	    break;
			case 0x24: bcc(m68_state);	    break;
			case 0x25: bcs(m68_state);	    break;
			case 0x26: bne(m68_state);	    break;
			case 0x27: beq(m68_state);	    break;
			case 0x28: bvc(m68_state);	    break;
			case 0x29: bvs(m68_state);	    break;
			case 0x2a: bpl(m68_state);	    break;
			case 0x2b: bmi(m68_state);	    break;
			case 0x2c: bge(m68_state);	    break;
			case 0x2d: blt(m68_state);	    break;
			case 0x2e: bgt(m68_state);	    break;
			case 0x2f: ble(m68_state);	    break;
			case 0x30: leax(m68_state);	    break;
			case 0x31: leay(m68_state);	    break;
			case 0x32: leas(m68_state);	    break;
			case 0x33: leau(m68_state);	    break;
			case 0x34: pshs(m68_state);	    break;
			case 0x35: puls(m68_state);	    break;
			case 0x36: pshu(m68_state);	    break;
			case 0x37: pulu(m68_state);	    break;
			case 0x38: IIError(m68_state);   break;
			case 0x39: rts(m68_state);	    break;
			case 0x3a: abx(m68_state);	    break;
			case 0x3b: rti(m68_state);	    break;
			case 0x3c: cwai(m68_state);	    break;
			case 0x3d: mul(m68_state);	    break;
			case 0x3e: IIError(m68_state);   break;
			case 0x3f: swi(m68_state);	    break;
			case 0x40: nega(m68_state);	    break;
			case 0x41: IIError(m68_state);   break;
			case 0x42: IIError(m68_state);   break;
			case 0x43: coma(m68_state);	    break;
			case 0x44: lsra(m68_state);	    break;
			case 0x45: IIError(m68_state);   break;
			case 0x46: rora(m68_state);	    break;
			case 0x47: asra(m68_state);	    break;
			case 0x48: asla(m68_state);	    break;
			case 0x49: rola(m68_state);	    break;
			case 0x4a: deca(m68_state);	    break;
			case 0x4b: IIError(m68_state);   break;
			case 0x4c: inca(m68_state);	    break;
			case 0x4d: tsta(m68_state);	    break;
			case 0x4e: IIError(m68_state);   break;
			case 0x4f: clra(m68_state);	    break;
			case 0x50: negb(m68_state);	    break;
			case 0x51: IIError(m68_state);   break;
			case 0x52: IIError(m68_state);   break;
			case 0x53: comb(m68_state);	    break;
			case 0x54: lsrb(m68_state);	    break;
			case 0x55: IIError(m68_state);   break;
			case 0x56: rorb(m68_state);	    break;
			case 0x57: asrb(m68_state);	    break;
			case 0x58: aslb(m68_state);	    break;
			case 0x59: rolb(m68_state);	    break;
			case 0x5a: decb(m68_state);	    break;
			case 0x5b: IIError(m68_state);   break;
			case 0x5c: incb(m68_state);	    break;
			case 0x5d: tstb(m68_state);	    break;
			case 0x5e: IIError(m68_state);   break;
			case 0x5f: clrb(m68_state);	    break;
			case 0x60: neg_ix(m68_state);    break;
			case 0x61: IIError(m68_state);   break;
			case 0x62: IIError(m68_state);   break;
			case 0x63: com_ix(m68_state);    break;
			case 0x64: lsr_ix(m68_state);    break;
			case 0x65: IIError(m68_state);   break;
			case 0x66: ror_ix(m68_state);    break;
			case 0x67: asr_ix(m68_state);    break;
			case 0x68: asl_ix(m68_state);    break;
			case 0x69: rol_ix(m68_state);    break;
			case 0x6a: dec_ix(m68_state);    break;
			case 0x6b: IIError(m68_state);   break;
			case 0x6c: inc_ix(m68_state);    break;
			case 0x6d: tst_ix(m68_state);    break;
			case 0x6e: jmp_ix(m68_state);    break;
			case 0x6f: clr_ix(m68_state);    break;
			case 0x70: neg_ex(m68_state);    break;
			case 0x71: IIError(m68_state);   break;
			case 0x72: IIError(m68_state);   break;
			case 0x73: com_ex(m68_state);    break;
			case 0x74: lsr_ex(m68_state);    break;
			case 0x75: IIError(m68_state);   break;
			case 0x76: ror_ex(m68_state);    break;
			case 0x77: asr_ex(m68_state);    break;
			case 0x78: asl_ex(m68_state);    break;
			case 0x79: rol_ex(m68_state);    break;
			case 0x7a: dec_ex(m68_state);    break;
			case 0x7b: IIError(m68_state);   break;
			case 0x7c: inc_ex(m68_state);    break;
			case 0x7d: tst_ex(m68_state);    break;
			case 0x7e: jmp_ex(m68_state);    break;
			case 0x7f: clr_ex(m68_state);    break;
			case 0x80: suba_im(m68_state);   break;
			case 0x81: cmpa_im(m68_state);   break;
			case 0x82: sbca_im(m68_state);   break;
			case 0x83: subd_im(m68_state);   break;
			case 0x84: anda_im(m68_state);   break;
			case 0x85: bita_im(m68_state);   break;
			case 0x86: lda_im(m68_state);    break;
			case 0x87: sta_im(m68_state);    break;
			case 0x88: eora_im(m68_state);   break;
			case 0x89: adca_im(m68_state);   break;
			case 0x8a: ora_im(m68_state);    break;
			case 0x8b: adda_im(m68_state);   break;
			case 0x8c: cmpx_im(m68_state);   break;
			case 0x8d: bsr(m68_state);	    break;
			case 0x8e: ldx_im(m68_state);    break;
			case 0x8f: stx_im(m68_state);    break;
			case 0x90: suba_di(m68_state);   break;
			case 0x91: cmpa_di(m68_state);   break;
			case 0x92: sbca_di(m68_state);   break;
			case 0x93: subd_di(m68_state);   break;
			case 0x94: anda_di(m68_state);   break;
			case 0x95: bita_di(m68_state);   break;
			case 0x96: lda_di(m68_state);    break;
			case 0x97: sta_di(m68_state);    break;
			case 0x98: eora_di(m68_state);   break;
			case 0x99: adca_di(m68_state);   break;
			case 0x9a: ora_di(m68_state);    break;
			case 0x9b: adda_di(m68_state);   break;
			case 0x9c: cmpx_di(m68_state);   break;
			case 0x9d: jsr_di(m68_state);    break;
			case 0x9e: ldx_di(m68_state);    break;
			case 0x9f: stx_di(m68_state);    break;
			case 0xa0: suba_ix(m68_state);   break;
			case 0xa1: cmpa_ix(m68_state);   break;
			case 0xa2: sbca_ix(m68_state);   break;
			case 0xa3: subd_ix(m68_state);   break;
			case 0xa4: anda_ix(m68_state);   break;
			case 0xa5: bita_ix(m68_state);   break;
			case 0xa6: lda_ix(m68_state);    break;
			case 0xa7: sta_ix(m68_state);    break;
			case 0xa8: eora_ix(m68_state);   break;
			case 0xa9: adca_ix(m68_state);   break;
			case 0xaa: ora_ix(m68_state);    break;
			case 0xab: adda_ix(m68_state);   break;
			case 0xac: cmpx_ix(m68_state);   break;
			case 0xad: jsr_ix(m68_state);    break;
			case 0xae: ldx_ix(m68_state);    break;
			case 0xaf: stx_ix(m68_state);    break;
			case 0xb0: suba_ex(m68_state);   break;
			case 0xb1: cmpa_ex(m68_state);   break;
			case 0xb2: sbca_ex(m68_state);   break;
			case 0xb3: subd_ex(m68_state);   break;
			case 0xb4: anda_ex(m68_state);   break;
			case 0xb5: bita_ex(m68_state);   break;
			case 0xb6: lda_ex(m68_state);    break;
			case 0xb7: sta_ex(m68_state);    break;
			case 0xb8: eora_ex(m68_state);   break;
			case 0xb9: adca_ex(m68_state);   break;
			case 0xba: ora_ex(m68_state);    break;
			case 0xbb: adda_ex(m68_state);   break;
			case 0xbc: cmpx_ex(m68_state);   break;
			case 0xbd: jsr_ex(m68_state);    break;
			case 0xbe: ldx_ex(m68_state);    break;
			case 0xbf: stx_ex(m68_state);    break;
			case 0xc0: subb_im(m68_state);   break;
			case 0xc1: cmpb_im(m68_state);   break;
			case 0xc2: sbcb_im(m68_state);   break;
			case 0xc3: addd_im(m68_state);   break;
			case 0xc4: andb_im(m68_state);   break;
			case 0xc5: bitb_im(m68_state);   break;
			case 0xc6: ldb_im(m68_state);    break;
			case 0xc7: stb_im(m68_state);    break;
			case 0xc8: eorb_im(m68_state);   break;
			case 0xc9: adcb_im(m68_state);   break;
			case 0xca: orb_im(m68_state);    break;
			case 0xcb: addb_im(m68_state);   break;
			case 0xcc: ldd_im(m68_state);    break;
			case 0xcd: std_im(m68_state);    break;
			case 0xce: ldu_im(m68_state);    break;
			case 0xcf: stu_im(m68_state);    break;
			case 0xd0: subb_di(m68_state);   break;
			case 0xd1: cmpb_di(m68_state);   break;
			case 0xd2: sbcb_di(m68_state);   break;
			case 0xd3: addd_di(m68_state);   break;
			case 0xd4: andb_di(m68_state);   break;
			case 0xd5: bitb_di(m68_state);   break;
			case 0xd6: ldb_di(m68_state);    break;
			case 0xd7: stb_di(m68_state);    break;
			case 0xd8: eorb_di(m68_state);   break;
			case 0xd9: adcb_di(m68_state);   break;
			case 0xda: orb_di(m68_state);    break;
			case 0xdb: addb_di(m68_state);   break;
			case 0xdc: ldd_di(m68_state);    break;
			case 0xdd: std_di(m68_state);    break;
			case 0xde: ldu_di(m68_state);    break;
			case 0xdf: stu_di(m68_state);    break;
			case 0xe0: subb_ix(m68_state);   break;
			case 0xe1: cmpb_ix(m68_state);   break;
			case 0xe2: sbcb_ix(m68_state);   break;
			case 0xe3: addd_ix(m68_state);   break;
			case 0xe4: andb_ix(m68_state);   break;
			case 0xe5: bitb_ix(m68_state);   break;
			case 0xe6: ldb_ix(m68_state);    break;
			case 0xe7: stb_ix(m68_state);    break;
			case 0xe8: eorb_ix(m68_state);   break;
			case 0xe9: adcb_ix(m68_state);   break;
			case 0xea: orb_ix(m68_state);    break;
			case 0xeb: addb_ix(m68_state);   break;
			case 0xec: ldd_ix(m68_state);    break;
			case 0xed: std_ix(m68_state);    break;
			case 0xee: ldu_ix(m68_state);    break;
			case 0xef: stu_ix(m68_state);    break;
			case 0xf0: subb_ex(m68_state);   break;
			case 0xf1: cmpb_ex(m68_state);   break;
			case 0xf2: sbcb_ex(m68_state);   break;
			case 0xf3: addd_ex(m68_state);   break;
			case 0xf4: andb_ex(m68_state);   break;
			case 0xf5: bitb_ex(m68_state);   break;
			case 0xf6: ldb_ex(m68_state);    break;
			case 0xf7: stb_ex(m68_state);    break;
			case 0xf8: eorb_ex(m68_state);   break;
			case 0xf9: adcb_ex(m68_state);   break;
			case 0xfa: orb_ex(m68_state);    break;
			case 0xfb: addb_ex(m68_state);   break;
			case 0xfc: ldd_ex(m68_state);    break;
			case 0xfd: std_ex(m68_state);    break;
			case 0xfe: ldu_ex(m68_state);    break;
			case 0xff: stu_ex(m68_state);    break;
			}
#else
            		(*m6809_main[m68_state->ireg])(m68_state);
#endif    /* BIG_SWITCH */
        		m68_state->icount -= cycles1[m68_state->ireg];

		} while( m68_state->icount > 0 );

        m68_state->icount -= m68_state->extra_cycles;
		m68_state->extra_cycles = 0;
    }

    return cycles - m68_state->icount;   /* NS 970908 */
}