--- np2/bios/bios.c	2003/12/25 03:02:40	1.16
+++ np2/bios/bios.c	2004/03/19 00:30:00	1.60
@@ -1,12 +1,12 @@
 #include	"compiler.h"
+#include	"strres.h"
 #include	"dosio.h"
 #include	"cpucore.h"
 #include	"pccore.h"
 #include	"iocore.h"
 #include	"bios.h"
 #include	"biosmem.h"
-#include	"sound.h"
-#include	"fmboard.h"
+#include	"sxsibios.h"
 #include	"lio.h"
 #include	"fddfile.h"
 #include	"fdd_mtr.h"
@@ -14,28 +14,94 @@
 #include	"keytable.res"
 #include	"itfrom.res"
 #include	"startup.res"
+#include	"biosfd80.res"
 
 
-	BOOL	biosrom = FALSE;
+#define	BIOS_SIMULATE
 
-static const char file_biosrom[] = "bios.rom";
+	BOOL	biosrom = FALSE;
 
 static const char neccheck[] = "Copyright (C) 1983 by NEC Corporation";
 
-						// 00/05/18 MS-DOS6.2 on PC-9801VX calling proc
-static const BYTE printmain[] = {0x90, 0x5a, 0x1f, 0xcf};
+typedef struct {
+	UINT8	port;
+	UINT8	data;
+} IODATA;
+
+static const IODATA iodata[] = {
+			// DMA
+				{0x29, 0x00}, {0x29, 0x01}, {0x29, 0x02}, {0x29, 0x03},
+				{0x27, 0x00}, {0x21, 0x00}, {0x23, 0x00}, {0x25, 0x00},
+				{0x1b, 0x00}, {0x11, 0x40},
+
+			// PIT
+				{0x77, 0x30}, {0x71, 0x00}, {0x71, 0x00},
+				{0x77, 0x76}, {0x73, 0xcd}, {0x73, 0x04},
+				{0x77, 0xb6},
+
+			// PIC
+				{0x00, 0x11}, {0x02, 0x08}, {0x02, 0x80}, {0x02, 0x1d},
+				{0x08, 0x11}, {0x0a, 0x10}, {0x0a, 0x07}, {0x0a, 0x09},
+				{0x02, 0x7d}, {0x0a, 0x71}};
+
+static const UINT8 msw_default[8] =
+							{0x48, 0x05, 0x04, 0x00, 0x01, 0x00, 0x00, 0x6e};
+
+
+static void bios_itfprepare(void) {
+
+const IODATA	*p;
+const IODATA	*pterm;
+
+	crtc_biosreset();
+	gdc_biosreset();
+
+	p = iodata;
+	pterm = iodata + (sizeof(iodata) / sizeof(IODATA));
+	while(p < pterm) {
+		iocore_out8(p->port, p->data);
+		p++;
+	}
+}
+
+static void bios_memclear(void) {
 
+	ZeroMemory(mem + 0x400, 0xa0000 - 0x400);
+	ZeroMemory(mem + 0x100000, 0x10000);
+	if (CPU_EXTMEM) {
+		ZeroMemory(CPU_EXTMEM, CPU_EXTMEMSIZE);
+	}
+	bios0x18_16(0x20, 0xe1);
+	ZeroMemory(mem + VRAM0_B, 0x18000);
+	ZeroMemory(mem + VRAM0_E, 0x08000);
+	ZeroMemory(mem + VRAM1_B, 0x18000);
+	ZeroMemory(mem + VRAM1_E, 0x08000);
+}
 
 static void bios_reinitbyswitch(void) {
 
 	BYTE	prxcrt;
 	BYTE	prxdupd;
 	BYTE	biosflag;
-	BYTE	ext_mem;
+	UINT8	boot;
 
-	CPU_TYPE = 0;
-	prxcrt = 0xc8;
-	if (gdc.display & 2) {
+	if (!(np2cfg.dipsw[2] & 0x80)) {
+#if defined(CPUCORE_IA32)
+		mem[MEMB_SYS_TYPE] = 0x03;		// 80386〜
+#else
+		mem[MEMB_SYS_TYPE] = 0x01;		// 80286
+#endif
+	}
+	else {
+		mem[MEMB_SYS_TYPE] = 0x00;		// V30
+	}
+
+	mem[MEMB_BIOS_FLAG0] = 0x01;
+	prxcrt = 0x08;
+	if (!(np2cfg.dipsw[0] & 0x01)) {			// dipsw1-1 on
+		prxcrt |= 0x40;
+	}
+	if (gdc.display & (1 << GDCDISP_ANALOG)) {
 		prxcrt |= 0x04;							// color16
 	}
 	if (!(np2cfg.dipsw[0] & 0x80)) {			// dipsw1-8 on
@@ -56,178 +122,192 @@ static void bios_reinitbyswitch(void) {
 	mem[MEMB_PRXDUPD] = prxdupd;
 
 	biosflag = 0x20;
-	if (pc.cpumode & CPUMODE_8MHz) {
+	if (pccore.cpumode & CPUMODE_8MHZ) {
 		biosflag |= 0x80;
 	}
 	biosflag |= mem[0xa3fea] & 7;
-	if (!(np2cfg.dipsw[2] & 0x80)) {
-		ext_mem = np2cfg.EXTMEM;									// ver0.28
-	}
-	else {
-		CPU_TYPE = CPUTYPE_V30;
-		ext_mem = 0;
+	if (np2cfg.dipsw[2] & 0x80) {
 		biosflag |= 0x40;
 	}
-	if (extmem_init(ext_mem)) {										// ver0.28
-		ext_mem = 0;							// メモリ確保に失敗
-	}
-	mem[MEMB_BIOS_FLAG] = biosflag;
-	mem[MEMB_EXPMMSZ] = (BYTE)(ext_mem << 3);
+	mem[MEMB_BIOS_FLAG1] = biosflag;
+	mem[MEMB_EXPMMSZ] = (BYTE)(pccore.extmem << 3);
 	mem[MEMB_CRT_RASTER] = 0x0f;
 
-	gdc.display &= ~4;
-	if (!(np2cfg.dipsw[0] & 0x04)) {			// dipsw1-3 on
-		gdc.display |= 4;
-	}
-	gdcs.textdisp |= GDCSCRN_EXT;
-
-	if (((pc.model & PCMODELMASK) >= PCMODEL_VX) && (usesound & 0x7e)) {
-		iocore_out8(0x188, 0x27);
-		iocore_out8(0x18a, 0x3f);
+	// FDD initialize
+	SETBIOSMEM32(MEMD_F2DD_POINTER, 0xfd801ad7);
+	SETBIOSMEM32(MEMD_F2HD_POINTER, 0xfd801aaf);
+	boot = mem[MEMB_MSW5] & 0xf0;
+	if (boot != 0x20) {		// 1MB
+		fddbios_equip(3, TRUE);
+		mem[MEMB_BIOS_FLAG0] |= 0x02;
+	}
+	else {					// 640KB
+		fddbios_equip(0, TRUE);
+		mem[MEMB_BIOS_FLAG0] &= ~0x02;
+	}
+	mem[MEMB_F2DD_MODE] = 0xff;
+
+#if defined(SUPPORT_CRT31KHZ)
+	mem[MEMB_CRT_BIOS] = 0x80;
+#endif
+#if defined(SUPPORT_PC9821)
+	mem[0x45c] = 0x40;
+#endif
+
+	// FDC
+	if (fdc.support144) {
+		mem[MEMB_F144_SUP] |= fdc.equip;
+	}
+
+	// IDE initialize
+	if (pccore.hddif & PCHDD_IDE) {
+		mem[MEMB_SYS_TYPE] |= 0x80;		// IDE
+		CPU_AX = 0x8300;
+		sasibios_operate();
 	}
 }
 
-static void bios_vectorset(void) {									// ver0.30
+static void bios_vectorset(void) {
 
 	UINT	i;
 
-	for (i=0; i<0x400; i+=4) {
-		SETBIOSMEM16(i+0, BIOSOFST_IRET);
-		SETBIOSMEM16(i+2, BIOS_SEG);
-	}
 	for (i=0; i<0x20; i++) {
-		*(UINT16 *)(mem + (i*4)) = *(UINT16 *)(mem + 0xfd868 + (i*2));
+		*(UINT16 *)(mem + (i*4)) = *(UINT16 *)(mem + BIOS_BASE + BIOS_TABLE + (i*2));
+		SETBIOSMEM16((i * 4) + 2, BIOS_SEG);
 	}
 	SETBIOSMEM32(0x1e*4, 0xe8000000);
 }
 
+static void bios_screeninit(void) {
 
-// CDSで見てる為、変更…(涙
-static const UINT16 biosoffset[0x20] = {
-			BIOSOFST_IRET,	BIOSOFST_IRET,	BIOSOFST_02,	BIOSOFST_IRET,
-			BIOSOFST_IRET,	BIOSOFST_IRET,	BIOSOFST_IRET,	BIOSOFST_IRET,
-
-			BIOSOFST_08,	BIOSOFST_09,	BIOSOFST_EOIM,	BIOSOFST_EOIM,
-			BIOSOFST_0c,	BIOSOFST_EOIM,	BIOSOFST_EOIM,	BIOSOFST_EOIM,
-
-			BIOSOFST_EOIS,	BIOSOFST_EOIS,	BIOSOFST_12,	BIOSOFST_13,
-			BIOSOFST_EOIS,	BIOSOFST_EOIS,	BIOSOFST_EOIS,	BIOSOFST_EOIS,
+	REG8	al;
 
-			BIOSOFST_18,	BIOSOFST_19,	BIOSOFST_1a,	BIOSOFST_1b,
-			BIOSOFST_1c,	BIOSOFST_IRET,	BIOSOFST_1e,	BIOSOFST_IRET};
+	al = 4;
+	al += (np2cfg.dipsw[1] & 0x04) >> 1;
+	al += (np2cfg.dipsw[1] & 0x08) >> 3;
+	bios0x18_0a(al);
+}
 
 
-void bios_init(void) {
+void bios_initialize(void) {
 
 	char	path[MAX_PATH];
 	FILEH	fh;
 	UINT	i;
+	UINT32	tmp;
 	UINT	pos;
 
 	biosrom = FALSE;
-
-	// まぁDISK BASIC動くようになるからいいんじゃないですか？
-	// BASIC BIOSは 8086コードのように見えるけど…
-	getbiospath(path, file_biosrom, sizeof(path));
+	getbiospath(path, str_biosrom, sizeof(path));
 	fh = file_open_rb(path);
 	if (fh != FILEH_INVALID) {
-		if (file_read(fh, mem + 0x0e8000, 0x18000) == 0x18000) {
-			biosrom = TRUE;
-		}
+		biosrom = (file_read(fh, mem + 0x0e8000, 0x18000) == 0x18000);
 		file_close(fh);
 	}
-	if (!biosrom) {
+	if (biosrom) {
+		TRACEOUT(("load bios.rom"));
+		// PnP BIOSを潰す
+		for (i=0; i<0x10000; i+=0x10) {
+			tmp = LOADINTELDWORD(mem + 0xf0000 + i);
+			if (tmp == 0x506e5024) {
+				TRACEOUT(("found PnP BIOS at %.5x", 0xf0000 + i));
+				STOREINTELDWORD(mem + 0xf0000 + i, 0x32504e24);
+			}
+		}
+	}
+	else {
 		CopyMemory(mem + 0x0e8000, nosyscode, sizeof(nosyscode));
 	}
 
-	// BIOS hookのアドレス変更
-	for (i=0; i<0x20; i++) {
-		STOREINTELWORD(mem + 0xfd868 + i*2, biosoffset[i]);
-	}
-	SETBIOSMEM16(BIOS_BASE + BIOSOFST_IRET, 0x50cf);
-	SETBIOSMEM16(BIOS_BASE + BIOSOFST_WAIT, 0xcf90);
-	for (i=(BIOS_BASE+BIOSOFST_EOIM); i<=(BIOS_BASE+BIOSOFST_1c); i+=2) {
-		SETBIOSMEM16(i, 0xcf90);
+#if defined(SUPPORT_PC9821)
+	getbiospath(path, "bios9821.rom", sizeof(path));
+	fh = file_open_rb(path);
+	if (fh != FILEH_INVALID) {
+		if (file_read(fh, mem + 0x0d8000, 0x2000) == 0x2000) {
+			// IDE BIOSを潰す
+			TRACEOUT(("load bios9821.rom"));
+			STOREINTELWORD(mem + 0x0d8009, 0);
+		}
+		file_close(fh);
 	}
-	CopyMemory(mem + BIOS_BASE + BIOSOFST_PRT, printmain, sizeof(printmain));
+#endif
 
-	bios_vectorset();												// ver0.29
+#if defined(BIOS_SIMULATE)
+	CopyMemory(mem + BIOS_BASE, biosfd80, sizeof(biosfd80));
 	if (!biosrom) {
-		lio_init();
+		lio_initialize();
 	}
 
-	SETBIOSMEM16(0xfd800, 0xcb90);
-	SETBIOSMEM16(0xfd802, 0xcb90);
 	for (i=0; i<8; i+=2) {
 		STOREINTELWORD(mem + 0xfd800 + 0x1aaf + i, 0x1ab7);
 		STOREINTELWORD(mem + 0xfd800 + 0x1ad7 + i, 0x1adf);
-		STOREINTELWORD(mem + 0xfd800 + 0x2361 + i, 0x1980);			// ver0.31
+		STOREINTELWORD(mem + 0xfd800 + 0x2361 + i, 0x1980);
 	}
 	CopyMemory(mem + 0xfd800 + 0x1ab7, fdfmt2hd, sizeof(fdfmt2hd));
 	CopyMemory(mem + 0xfd800 + 0x1adf, fdfmt2dd, sizeof(fdfmt2dd));
-	CopyMemory(mem + 0xfd800 + 0x1980, fdfmt144, sizeof(fdfmt144));	// ver0.31
+	CopyMemory(mem + 0xfd800 + 0x1980, fdfmt144, sizeof(fdfmt144));
 
 	SETBIOSMEM16(0xfffe8, 0xcb90);
 	SETBIOSMEM16(0xfffec, 0xcb90);
 	mem[0xffff0] = 0xea;
 	STOREINTELDWORD(mem + 0xffff1, 0xfd800000);
 
-#if 1
+	if ((!biosrom) && (!(pccore.model & PCMODEL_EPSON))) {
+		CopyMemory(mem + 0xe8dd8, neccheck, 0x25);
+		pos = LOADINTELWORD(itfrom + 2);
+		CopyMemory(mem + 0xf538e, itfrom + pos, 0x27);
+	}
+
+	CopyMemory(mem + 0x0fde00, keytable[0], 0x300);
+
 	CopyMemory(mem + ITF_ADRS, itfrom, sizeof(itfrom));
 	mem[ITF_ADRS + 0x7ff0] = 0xea;
 	STOREINTELDWORD(mem + ITF_ADRS + 0x7ff1, 0xf8000000);
-#if 0
-fh = file_create("itf.rom");
-if (fh != FILEH_INVALID) {
-	file_write(fh, itfrom, sizeof(itfrom));
-	file_close(fh);
-}
-#endif
+	if (pccore.model & PCMODEL_EPSON) {
+		mem[ITF_ADRS + 0x7ff1] = 0x04;
+	}
+	else if ((pccore.model & PCMODELMASK) == PCMODEL_VM) {
+		mem[ITF_ADRS + 0x7ff1] = 0x08;
+	}
 #else
 	fh = file_open_c("itf.rom");
 	if (fh != FILEH_INVALID) {
-		file_read(fh, &mem[ITF_ADRS], 0x8000);
+		file_read(fh, mem + ITF_ADRS, 0x8000);
 		file_close(fh);
+		TRACEOUT(("load itf.rom"));
 	}
 #endif
-	if ((!biosrom) && (!(pc.model & PCMODEL_EPSON))) {
-		CopyMemory(mem + 0xe8dd8, neccheck, 0x25);
-		pos = LOADINTELWORD(itfrom + 2);
-		CopyMemory(mem + 0xf538e, itfrom + pos, 0x27);
-	}
-
-	bios_reinitbyswitch();
-	mem[MEMB_CRT_STS_FLAG] = 0x84;
-	mem[MEMB_BIOS_FLAG0] = 0x03;						// 00/05/17 beep tone
-	mem[MEMB_F2DD_MODE] = 0xff;										// ver0.29
- 	SETBIOSMEM16(MEMW_DISK_EQUIP, 0x0003);							// ver0.29
-	SETBIOSMEM32(MEMD_F2DD_POINTER, 0xfd801ad7);
-	SETBIOSMEM32(MEMD_F2HD_POINTER, 0xfd801aaf);
-	mem[0x005ae] |= 0x03;											// ver0.31
 
-	CopyMemory(mem + 0x0fde00, keytable[0], 0x300);
-	bios0x09_init();
+	CopyMemory(mem + 0x1c0000, mem + ITF_ADRS, 0x08000);
+	CopyMemory(mem + 0x1e8000, mem + 0x0e8000, 0x10000);
 }
 
-static void bios_boot(void) {
 
-	if (sysport.c & 0x80) {
-		if (!(sysport.c & 0x20)) {
-			bios_reinitbyswitch();
+static void bios_itfcall(void) {
+
+	int		i;
+
+	bios_itfprepare();
+	bios_memclear();
+	bios_vectorset();
+	bios0x09_init();
+	bios_reinitbyswitch();
+	bios0x18_0c();
+
+	if (!np2cfg.ITF_WORK) {
+		for (i=0; i<8; i++) {
+			mem[MEMB_MSW + (i*4)] = msw_default[i];
 		}
-		CPU_CS = 0x0000;
-		CPU_IP = 0x04f8;
-		CPU_DS = 0x0000;
+		CPU_FLAGL |= C_FLAG;
+	}
+	else {
 		CPU_DX = 0x43d;
 		CPU_AL = 0x10;
 		mem[0x004f8] = 0xee;		// out	dx, al
 		mem[0x004f9] = 0xea;		// call	far
 		SETBIOSMEM16(0x004fa, 0x0000);
 		SETBIOSMEM16(0x004fc, 0xffff);
-	}
-	else {
-		CPU_SP = GETBIOSMEM16(0x00404);
-		CPU_SS = GETBIOSMEM16(0x00406);
+		CPU_FLAGL &= ~C_FLAG;
 	}
 }
 
@@ -237,32 +317,43 @@ UINT MEMCALL biosfunc(UINT32 adrs) {
 	UINT16	bootseg;
 
 	if ((CPU_ITFBANK) && (adrs >= 0xf8000) && (adrs < 0x100000)) {
-		CPU_IP--;
-		CPU_REMCLOCK = -1;
-		return(1);
+		// for epson ITF
+		return(0);
 	}
 
-	switch(adrs) {													// ver0.30
-		case BIOS_BASE + BIOSOFST_EOIM:
-			CPU_REMCLOCK -= 300;
-			iocore_out8(0x00, 0x20);
-			return(0);
-
-		case BIOS_BASE + BIOSOFST_EOIS:
-			iocore_out8(0x08, 0x20);
-			if (!pic.pi[1].isr) {
-				iocore_out8(0x00, 0x20);
+//	TRACEOUT(("biosfunc(%x)", adrs));
+#if defined(CPUCORE_IA32) && defined(TRACE)
+	if (CPU_STAT_PAGING) {
+		UINT32 pde = i286_memoryread_d(CPU_STAT_PDE_BASE);
+		if (!(pde & CPU_PDE_PRESENT)) {
+			TRACEOUT(("page0: PTE not present"));
+		}
+		else {
+			UINT32 pte = i286_memoryread_d(pde & CPU_PDE_BASEADDR_MASK);
+			if (!(pte & CPU_PTE_PRESENT)) {
+				TRACEOUT(("page0: not present"));
 			}
-			return(0);
+			else if (pte & CPU_PTE_BASEADDR_MASK) {
+				TRACEOUT(("page0: physical address != 0 (pte = %.8x)", pte));
+			}
+		}
+	}
+#endif
 
-		case BIOS_BASE + BIOSOFST_02:
-			CPU_REMCLOCK -= 300;
-			bios0x02();
+	switch(adrs) {
+		case BIOS_BASE + BIOSOFST_ITF:		// リセット
+			bios_itfcall();
 			return(1);
 
-		case BIOS_BASE + BIOSOFST_08:
-			CPU_REMCLOCK -= 300;
-			bios0x08();
+		case BIOS_BASE + BIOSOFST_INIT:		// ブート
+			bios_reinitbyswitch();
+			bios_vectorset();
+			bios_screeninit();
+			if (((pccore.model & PCMODELMASK) >= PCMODEL_VX) &&
+				(pccore.sound & 0x7e)) {
+				iocore_out8(0x188, 0x27);
+				iocore_out8(0x18a, 0x3f);
+			}
 			return(1);
 
 		case BIOS_BASE + BIOSOFST_09:
@@ -295,12 +386,18 @@ UINT MEMCALL biosfunc(UINT32 adrs) {
 			bios0x19();
 			return(1);
 
-		case BIOS_BASE + BIOSOFST_1a:
+		case BIOS_BASE + BIOSOFST_CMT:
+			CPU_REMCLOCK -= 200;
+			bios0x1a_cmt();
+			return(1);
+
+		case BIOS_BASE + BIOSOFST_PRT:
 			CPU_REMCLOCK -= 200;
-			bios0x1a();
+			bios0x1a_prt();
 			return(1);
 
 		case BIOS_BASE + BIOSOFST_1b:
+			CPU_STI;
 			CPU_REMCLOCK -= 200;
 			bios0x1b();
 			return(1);
@@ -310,50 +407,33 @@ UINT MEMCALL biosfunc(UINT32 adrs) {
 			bios0x1c();
 			return(1);
 
+		case BIOS_BASE + BIOSOFST_1f:
+			CPU_REMCLOCK -= 200;
+			bios0x1f();
+			return(1);
+
 		case BIOS_BASE + BIOSOFST_WAIT:
 			CPU_STI;
-			if (fddmtr_biosbusy) {						// ver0.26
+			if (fddmtr.busy) {
 				CPU_IP--;
 				CPU_REMCLOCK = -1;
 			}
 			else {
-				switch(CTRL_FDMEDIA) {
-					case DISKTYPE_2HD:
-						if (pic.pi[1].isr & PIC_INT42) {
-							CPU_IP--;
-							CPU_REMCLOCK -= 1000;
-						}
-						break;
-					case DISKTYPE_2DD:
-						if (pic.pi[1].isr & PIC_INT41) {
-							CPU_IP--;
-							CPU_REMCLOCK -= 1000;
-						}
-						break;
+				if (fdc.chgreg & 1) {
+					if (!(mem[0x0055e] & (0x01 << fdc.us))) {
+						CPU_IP--;
+						CPU_REMCLOCK -= 1000;
+					}
+				}
+				else {
+					if (!(mem[0x0055f] & (0x10 << fdc.us))) {
+						CPU_IP--;
+						CPU_REMCLOCK -= 1000;
+					}
 				}
 			}
 			return(1);
 
-		case BIOS_BASE + BIOSOFST_PRT:
-			bios0x1a_main();
-			return(0);
-
-		case 0xfd800:					// リセット
-			bios_boot();
-			return(1);
-
-		case 0xfd802:					// ブート
-			bios_reinitbyswitch();									// ver0.27
-			bios_vectorset();										// ver0.29
-			bootseg = bootstrapload();
-			CPU_STI;
-			CPU_CS = (bootseg != 0)?bootseg:0xe800;
-			CPU_DS = 0x0000;
-			CPU_SS = 0x0030;
-			CPU_SP = 0x00e6;
-			CPU_IP = 0x0000;
-			return(1);
-
 		case 0xfffe8:					// ブートストラップロード
 			CPU_REMCLOCK -= 2000;
 			bootseg = bootstrapload();
@@ -361,8 +441,6 @@ UINT MEMCALL biosfunc(UINT32 adrs) {
 				CPU_STI;
 				CPU_CS = bootseg;
 				CPU_IP = 0x0000;
-				CPU_SS = 0x0030;
-				CPU_SP = 0x00e6;
 				return(1);
 			}
 			return(0);
@@ -373,18 +451,20 @@ UINT MEMCALL biosfunc(UINT32 adrs) {
 			return(0);
 	}
 
-	if ((adrs >= 0xf9a00) && (adrs < 0x0f9a24)) {
-		if (!(adrs & 1)) {
-			bios_lio((BYTE)((adrs - 0xf9a00) >> 1));
+	if ((adrs >= 0xf9a00) && (adrs < 0x0f9a44)) {
+		if (!(adrs & 3)) {
+			CPU_REMCLOCK -= 500;
+			bios_lio((REG8)((adrs - 0xf9a00) >> 2));
+		}
+		else {
+			if (nevent_iswork(NEVENT_GDCSLAVE)) {
+				CPU_IP--;
+				CPU_REMCLOCK = -1;
+				return(1);
+			}
 		}
 		return(0);
 	}
-
-	if (biosrom) {
-		return(0);
-	}
-	CPU_IP--;
-	CPU_REMCLOCK = -1;
-	return(1);
+	return(0);
 }