start moving everything to C

1 files changed, 0 insertions, 726 deletions

diff --git a/source/fxemu.cpp b/source/fxemu.cpp
deleted file mode 100644
index 8dd7a15..0000000
--- a/source/fxemu.cpp
+++ /dev/null
@@ -1,726 +0,0 @@
-/*******************************************************************************
-  Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
- 
-  (c) Copyright 1996 - 2002 Gary Henderson (gary.henderson@ntlworld.com) and
-                            Jerremy Koot (jkoot@snes9x.com)
-
-  (c) Copyright 2001 - 2004 John Weidman (jweidman@slip.net)
-
-  (c) Copyright 2002 - 2004 Brad Jorsch (anomie@users.sourceforge.net),
-                            funkyass (funkyass@spam.shaw.ca),
-                            Joel Yliluoma (http://iki.fi/bisqwit/)
-                            Kris Bleakley (codeviolation@hotmail.com),
-                            Matthew Kendora,
-                            Nach (n-a-c-h@users.sourceforge.net),
-                            Peter Bortas (peter@bortas.org) and
-                            zones (kasumitokoduck@yahoo.com)
-
-  C4 x86 assembler and some C emulation code
-  (c) Copyright 2000 - 2003 zsKnight (zsknight@zsnes.com),
-                            _Demo_ (_demo_@zsnes.com), and Nach
-
-  C4 C++ code
-  (c) Copyright 2003 Brad Jorsch
-
-  DSP-1 emulator code
-  (c) Copyright 1998 - 2004 Ivar (ivar@snes9x.com), _Demo_, Gary Henderson,
-                            John Weidman, neviksti (neviksti@hotmail.com),
-                            Kris Bleakley, Andreas Naive
-
-  DSP-2 emulator code
-  (c) Copyright 2003 Kris Bleakley, John Weidman, neviksti, Matthew Kendora, and
-                     Lord Nightmare (lord_nightmare@users.sourceforge.net
-
-  OBC1 emulator code
-  (c) Copyright 2001 - 2004 zsKnight, pagefault (pagefault@zsnes.com) and
-                            Kris Bleakley
-  Ported from x86 assembler to C by sanmaiwashi
-
-  SPC7110 and RTC C++ emulator code
-  (c) Copyright 2002 Matthew Kendora with research by
-                     zsKnight, John Weidman, and Dark Force
-
-  S-DD1 C emulator code
-  (c) Copyright 2003 Brad Jorsch with research by
-                     Andreas Naive and John Weidman
- 
-  S-RTC C emulator code
-  (c) Copyright 2001 John Weidman
-  
-  ST010 C++ emulator code
-  (c) Copyright 2003 Feather, Kris Bleakley, John Weidman and Matthew Kendora
-
-  Super FX x86 assembler emulator code 
-  (c) Copyright 1998 - 2003 zsKnight, _Demo_, and pagefault 
-
-  Super FX C emulator code 
-  (c) Copyright 1997 - 1999 Ivar, Gary Henderson and John Weidman
-
-
-  SH assembler code partly based on x86 assembler code
-  (c) Copyright 2002 - 2004 Marcus Comstedt (marcus@mc.pp.se) 
-
- 
-  Specific ports contains the works of other authors. See headers in
-  individual files.
- 
-  Snes9x homepage: http://www.snes9x.com
- 
-  Permission to use, copy, modify and distribute Snes9x in both binary and
-  source form, for non-commercial purposes, is hereby granted without fee,
-  providing that this license information and copyright notice appear with
-  all copies and any derived work.
- 
-  This software is provided 'as-is', without any express or implied
-  warranty. In no event shall the authors be held liable for any damages
-  arising from the use of this software.
- 
-  Snes9x is freeware for PERSONAL USE only. Commercial users should
-  seek permission of the copyright holders first. Commercial use includes
-  charging money for Snes9x or software derived from Snes9x.
- 
-  The copyright holders request that bug fixes and improvements to the code
-  should be forwarded to them so everyone can benefit from the modifications
-  in future versions.
- 
-  Super NES and Super Nintendo Entertainment System are trademarks of
-  Nintendo Co., Limited and its subsidiary companies.
-*******************************************************************************/
-#include "fxemu.h"
-#include "fxinst.h"
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-
-/* The FxChip Emulator's internal variables */
-struct FxRegs_s GSU = FxRegs_s_null;
-
-uint32 (**fx_ppfFunctionTable)(uint32) = 0;
-void (**fx_ppfPlotTable)() = 0;
-void (**fx_ppfOpcodeTable)() = 0;
-
-#if 0
-void fx_setCache()
-{
-    uint32 c;
-    GSU.bCacheActive = TRUE;
-    GSU.pvRegisters[0x3e] &= 0xf0;
-    c = (uint32)GSU.pvRegisters[0x3e];
-    c |= ((uint32)GSU.pvRegisters[0x3f])<<8;
-    if(c == GSU.vCacheBaseReg)
-	return;
-    GSU.vCacheBaseReg = c;
-    GSU.vCacheFlags = 0;
-    if(c < (0x10000-512))
-    {
-	uint8 const* t = &ROM(c);
-	memcpy(GSU.pvCache,t,512);
-    }
-    else
-    {
-	uint8 const* t1;
-	uint8 const* t2;
-	uint32 i = 0x10000 - c;
-	t1 = &ROM(c);
-	t2 = &ROM(0);
-	memcpy(GSU.pvCache,t1,i);
-	memcpy(&GSU.pvCache[i],t2,512-i);
-    }
-}
-#endif
-
-void FxCacheWriteAccess(uint16 vAddress)
-{
-#if 0
-    if(!GSU.bCacheActive)
-    {
-	uint8 v = GSU.pvCache[GSU.pvCache[vAddress&0x1ff];
-	fx_setCache();
-	GSU.pvCache[GSU.pvCache[vAddress&0x1ff] = v;
-    }
-#endif
-    if((vAddress & 0x00f) == 0x00f)
-	GSU.vCacheFlags |= 1 << ((vAddress&0x1f0) >> 4);
-}
-
-void FxFlushCache()
-{
-    GSU.vCacheFlags = 0;
-    GSU.vCacheBaseReg = 0;
-    GSU.bCacheActive = FALSE;
-//    GSU.vPipe = 0x1;
-}
-
-static void fx_backupCache()
-{
-#if 0
-    uint32 i;
-    uint32 v = GSU.vCacheFlags;
-    uint32 c = USEX16(GSU.vCacheBaseReg);
-    if(v)
-	for(i=0; i<32; i++)
-	{
-	    if(v&1)
-	    {
-		if(c < (0x10000-16))
-		{
-		    uint8 * t = &GSU.pvPrgBank[c];
-		    memcpy(&GSU.avCacheBackup[i<<4],t,16);
-		    memcpy(t,&GSU.pvCache[i<<4],16);
-		}
-		else
-		{
-		    uint8 * t1;
-		    uint8 * t2;
-		    uint32 a = 0x10000 - c;
-		    t1 = &GSU.pvPrgBank[c];
-		    t2 = &GSU.pvPrgBank[0];
-		    memcpy(&GSU.avCacheBackup[i<<4],t1,a);
-		    memcpy(t1,&GSU.pvCache[i<<4],a);
-		    memcpy(&GSU.avCacheBackup[(i<<4)+a],t2,16-a);
-		    memcpy(t2,&GSU.pvCache[(i<<4)+a],16-a);
-		}		
-	    }
-	    c = USEX16(c+16);
-	    v >>= 1;
-	}
-#endif
-}
-
-static void fx_restoreCache()
-{
-#if 0
-    uint32 i;
-    uint32 v = GSU.vCacheFlags;
-    uint32 c = USEX16(GSU.vCacheBaseReg);
-    if(v)
-	for(i=0; i<32; i++)
-	{
-	    if(v&1)
-	    {
-		if(c < (0x10000-16))
-		{
-		    uint8 * t = &GSU.pvPrgBank[c];
-		    memcpy(t,&GSU.avCacheBackup[i<<4],16);
-		    memcpy(&GSU.pvCache[i<<4],t,16);
-		}
-		else
-		{
-		    uint8 * t1;
-		    uint8 * t2;
-		    uint32 a = 0x10000 - c;
-		    t1 = &GSU.pvPrgBank[c];
-		    t2 = &GSU.pvPrgBank[0];
-		    memcpy(t1,&GSU.avCacheBackup[i<<4],a);
-		    memcpy(&GSU.pvCache[i<<4],t1,a);
-		    memcpy(t2,&GSU.avCacheBackup[(i<<4)+a],16-a);
-		    memcpy(&GSU.pvCache[(i<<4)+a],t2,16-a);
-		}		
-	    }
-	    c = USEX16(c+16);
-	    v >>= 1;
-	}
-#endif
-}
-
-void fx_flushCache()
-{
-    fx_restoreCache();
-    GSU.vCacheFlags = 0;
-    GSU.bCacheActive = FALSE;
-}
-
-
-void fx_updateRamBank(uint8 Byte)
-{
-	// Update BankReg and Bank pointer
-    GSU.vRamBankReg = (uint32)Byte & (FX_RAM_BANKS-1);
-    GSU.pvRamBank = GSU.apvRamBank[Byte & 0x3];
-}
-
-
-static void fx_readRegisterSpace()
-{
-    int i;
-    uint8 *p;
-    static uint32 avHeight[] = { 128, 160, 192, 256 };
-    static uint32 avMult[] = { 16, 32, 32, 64 };
-
-    GSU.vErrorCode = 0;
-
-    /* Update R0-R15 */
-    p = GSU.pvRegisters;
-    for(i=0; i<16; i++)
-    {
-	GSU.avReg[i] = *p++;
-	GSU.avReg[i] += ((uint32)(*p++)) << 8;
-    }
-
-    /* Update other registers */
-    p = GSU.pvRegisters;
-    GSU.vStatusReg = (uint32)p[GSU_SFR];
-    GSU.vStatusReg |= ((uint32)p[GSU_SFR+1]) << 8;
-    GSU.vPrgBankReg = (uint32)p[GSU_PBR];
-    GSU.vRomBankReg = (uint32)p[GSU_ROMBR];
-    GSU.vRamBankReg = ((uint32)p[GSU_RAMBR]) & (FX_RAM_BANKS-1);
-    GSU.vCacheBaseReg = (uint32)p[GSU_CBR];
-    GSU.vCacheBaseReg |= ((uint32)p[GSU_CBR+1]) << 8;
-
-    /* Update status register variables */
-    GSU.vZero = !(GSU.vStatusReg & FLG_Z);
-    GSU.vSign = (GSU.vStatusReg & FLG_S) << 12;
-    GSU.vOverflow = (GSU.vStatusReg & FLG_OV) << 16;
-    GSU.vCarry = (GSU.vStatusReg & FLG_CY) >> 2;
-    
-    /* Set bank pointers */
-    GSU.pvRamBank = GSU.apvRamBank[GSU.vRamBankReg & 0x3];
-    GSU.pvRomBank = GSU.apvRomBank[GSU.vRomBankReg];
-    GSU.pvPrgBank = GSU.apvRomBank[GSU.vPrgBankReg];
-
-    /* Set screen pointers */
-    GSU.pvScreenBase = &GSU.pvRam[ USEX8(p[GSU_SCBR]) << 10 ];
-    i = (int)(!!(p[GSU_SCMR] & 0x04));
-    i |= ((int)(!!(p[GSU_SCMR] & 0x20))) << 1;
-    GSU.vScreenHeight = GSU.vScreenRealHeight = avHeight[i];
-    GSU.vMode = p[GSU_SCMR] & 0x03;
-#if 0
-    if(GSU.vMode == 2)
-	error illegal color depth GSU.vMode;
-#endif
-    if(i == 3)
-	GSU.vScreenSize = (256/8) * (256/8) * 32;
-    else
-	GSU.vScreenSize = (GSU.vScreenHeight/8) * (256/8) * avMult[GSU.vMode];
-    if (GSU.vPlotOptionReg & 0x10)
-    {
-	/* OBJ Mode (for drawing into sprites) */
-	GSU.vScreenHeight = 256;
-    }
-#if 0
-    if(GSU.pvScreenBase + GSU.vScreenSize > GSU.pvRam + (GSU.nRamBanks * 65536))
-	error illegal address for screen base register
-#else
-    if(GSU.pvScreenBase + GSU.vScreenSize > GSU.pvRam + (GSU.nRamBanks * 65536))
-	GSU.pvScreenBase =  GSU.pvRam + (GSU.nRamBanks * 65536) - GSU.vScreenSize;
-#endif
-    GSU.pfPlot = fx_apfPlotTable[GSU.vMode];
-    GSU.pfRpix = fx_apfPlotTable[GSU.vMode + 5];
-
-    fx_ppfOpcodeTable[0x04c] = GSU.pfPlot;
-    fx_ppfOpcodeTable[0x14c] = GSU.pfRpix;
-    fx_ppfOpcodeTable[0x24c] = GSU.pfPlot;
-    fx_ppfOpcodeTable[0x34c] = GSU.pfRpix;
-
-    fx_computeScreenPointers ();
-
-    fx_backupCache();
-}
-
-void fx_dirtySCBR()
-{
-	GSU.vSCBRDirty = TRUE;
-}
-
-void fx_computeScreenPointers ()
-{
-    if (GSU.vMode != GSU.vPrevMode || 
-	GSU.vPrevScreenHeight != GSU.vScreenHeight ||
-	GSU.vSCBRDirty)
-    {
-	int i;
-
-	GSU.vSCBRDirty = FALSE;
-
-	/* Make a list of pointers to the start of each screen column */
-	switch (GSU.vScreenHeight)
-	{
-	    case 128:
-		switch (GSU.vMode)
-		{
-		    case 0:
-			for (i = 0; i < 32; i++)
-			{
-			    GSU.apvScreen[i] = GSU.pvScreenBase + (i << 4);
-			    GSU.x[i] = i << 8;
-			}
-			break;
-		    case 1:
-			for (i = 0; i < 32; i++)
-			{
-			    GSU.apvScreen[i] = GSU.pvScreenBase + (i << 5);
-			    GSU.x[i] = i << 9;
-			}
-			break;
-		    case 2:
-		    case 3:
-			for (i = 0; i < 32; i++)
-			{
-			    GSU.apvScreen[i] = GSU.pvScreenBase + (i << 6);
-			    GSU.x[i] = i << 10;
-			}
-			break;
-		}
-		break;
-	    case 160:
-		switch (GSU.vMode)
-		{
-		    case 0:
-			for (i = 0; i < 32; i++)
-			{
-			    GSU.apvScreen[i] = GSU.pvScreenBase + (i << 4);
-			    GSU.x[i] = (i << 8) + (i << 6);
-			}
-			break;
-		    case 1:
-			for (i = 0; i < 32; i++)
-			{
-			    GSU.apvScreen[i] = GSU.pvScreenBase + (i << 5);
-			    GSU.x[i] = (i << 9) + (i << 7);
-			}
-			break;
-		    case 2:
-		    case 3:
-			for (i = 0; i < 32; i++)
-			{
-			    GSU.apvScreen[i] = GSU.pvScreenBase + (i << 6);
-			    GSU.x[i] = (i << 10) + (i << 8);
-			}
-			break;
-		}
-		break;
-	    case 192:
-		switch (GSU.vMode)
-		{
-		    case 0:
-			for (i = 0; i < 32; i++)
-			{
-			    GSU.apvScreen[i] = GSU.pvScreenBase + (i << 4);
-			    GSU.x[i] = (i << 8) + (i << 7);
-			}
-			break;
-		    case 1:
-			for (i = 0; i < 32; i++)
-			{
-			    GSU.apvScreen[i] = GSU.pvScreenBase + (i << 5);
-			    GSU.x[i] = (i << 9) + (i << 8);
-			}
-			break;
-		    case 2:
-		    case 3:
-			for (i = 0; i < 32; i++)
-			{
-			    GSU.apvScreen[i] = GSU.pvScreenBase + (i << 6);
-			    GSU.x[i] = (i << 10) + (i << 9);
-			}
-			break;
-		}
-		break;
-	    case 256:
-		switch (GSU.vMode)
-		{
-		    case 0:
-			for (i = 0; i < 32; i++)
-			{
-			    GSU.apvScreen[i] = GSU.pvScreenBase + 
-				((i & 0x10) << 9) + ((i & 0xf) << 8);
-			    GSU.x[i] = ((i & 0x10) << 8) + ((i & 0xf) << 4);
-			}
-			break;
-		    case 1:
-			for (i = 0; i < 32; i++)
-			{
-			    GSU.apvScreen[i] = GSU.pvScreenBase + 
-				((i & 0x10) << 10) + ((i & 0xf) << 9);
-			    GSU.x[i] = ((i & 0x10) << 9) + ((i & 0xf) << 5);
-			}
-			break;
-		    case 2:
-		    case 3:
-			for (i = 0; i < 32; i++)
-			{
-			    GSU.apvScreen[i] = GSU.pvScreenBase + 
-				((i & 0x10) << 11) + ((i & 0xf) << 10);
-			    GSU.x[i] = ((i & 0x10) << 10) + ((i & 0xf) << 6);
-			}
-			break;
-		}
-		break;
-	}
-	GSU.vPrevMode = GSU.vMode;
-	GSU.vPrevScreenHeight = GSU.vScreenHeight;
-    }
-}
-
-static void fx_writeRegisterSpace()
-{
-    int i;
-    uint8 *p;
-    
-    p = GSU.pvRegisters;
-    for(i=0; i<16; i++)
-    {
-	*p++ = (uint8)GSU.avReg[i];
-	*p++ = (uint8)(GSU.avReg[i] >> 8);
-    }
-
-    /* Update status register */
-    if( USEX16(GSU.vZero) == 0 ) SF(Z);
-    else CF(Z);
-    if( GSU.vSign & 0x8000 ) SF(S);
-    else CF(S);
-    if(GSU.vOverflow >= 0x8000 || GSU.vOverflow < -0x8000) SF(OV);
-    else CF(OV);
-    if(GSU.vCarry) SF(CY);
-    else CF(CY);
-    
-    p = GSU.pvRegisters;
-    p[GSU_SFR] = (uint8)GSU.vStatusReg;
-    p[GSU_SFR+1] = (uint8)(GSU.vStatusReg>>8);
-    p[GSU_PBR] = (uint8)GSU.vPrgBankReg;
-    p[GSU_ROMBR] = (uint8)GSU.vRomBankReg;
-    p[GSU_RAMBR] = (uint8)GSU.vRamBankReg;
-    p[GSU_CBR] = (uint8)GSU.vCacheBaseReg;
-    p[GSU_CBR+1] = (uint8)(GSU.vCacheBaseReg>>8);
-    
-    fx_restoreCache();
-}
-
-/* Reset the FxChip */
-void FxReset(struct FxInit_s *psFxInfo)
-{
-    int i;
-    static uint32 (**appfFunction[])(uint32) = {
-	&fx_apfFunctionTable[0],
-#if 0
-	&fx_a_apfFunctionTable[0],
-	&fx_r_apfFunctionTable[0],
-	&fx_ar_apfFunctionTable[0],
-#endif	
-    };
-    static void (**appfPlot[])() = {
-	&fx_apfPlotTable[0],
-#if 0
-	&fx_a_apfPlotTable[0],
-	&fx_r_apfPlotTable[0],
-	&fx_ar_apfPlotTable[0],
-#endif	
-    };
-    static void (**appfOpcode[])() = {
-	&fx_apfOpcodeTable[0],
-#if 0	
-	&fx_a_apfOpcodeTable[0],
-	&fx_r_apfOpcodeTable[0],
-	&fx_ar_apfOpcodeTable[0],
-#endif	
-    };
-
-    /* Get function pointers for the current emulation mode */
-    fx_ppfFunctionTable = appfFunction[psFxInfo->vFlags & 0x3];
-    fx_ppfPlotTable = appfPlot[psFxInfo->vFlags & 0x3];
-    fx_ppfOpcodeTable = appfOpcode[psFxInfo->vFlags & 0x3];
-    
-    /* Clear all internal variables */
-    memset((uint8*)&GSU,0,sizeof(struct FxRegs_s));
-
-    /* Set default registers */
-    GSU.pvSreg = GSU.pvDreg = &R0;
-
-    /* Set RAM and ROM pointers */
-    GSU.pvRegisters = psFxInfo->pvRegisters;
-    GSU.nRamBanks = psFxInfo->nRamBanks;
-    GSU.pvRam = psFxInfo->pvRam;
-    GSU.nRomBanks = psFxInfo->nRomBanks;
-    GSU.pvRom = psFxInfo->pvRom;
-    GSU.vPrevScreenHeight = ~0;
-    GSU.vPrevMode = ~0;
-
-    /* The GSU can't access more than 2mb (16mbits) */
-    if(GSU.nRomBanks > 0x20)
-	GSU.nRomBanks = 0x20;
-    
-    /* Clear FxChip register space */
-    memset(GSU.pvRegisters,0,0x300);
-
-    /* Set FxChip version Number */
-    GSU.pvRegisters[0x3b] = 0;
-
-    /* Make ROM bank table */
-    for(i=0; i<256; i++)
-    {
-	uint32 b = i & 0x7f;
-	if (b >= 0x40)
-	{
-	    if (GSU.nRomBanks > 1)
-		b %= GSU.nRomBanks;
-	    else
-		b &= 1;
-
-	    GSU.apvRomBank[i] = &GSU.pvRom[ b << 16 ];
-	}
-	else
-	{
-	    b %= GSU.nRomBanks * 2;
-	    GSU.apvRomBank[i] = &GSU.pvRom[ (b << 16) + 0x200000];
-	}
-    }
-
-    /* Make RAM bank table */
-    for(i=0; i<4; i++)
-    {
-	GSU.apvRamBank[i] = &GSU.pvRam[(i % GSU.nRamBanks) << 16];
-	GSU.apvRomBank[0x70 + i] = GSU.apvRamBank[i];
-    }
-    
-    /* Start with a nop in the pipe */
-    GSU.vPipe = 0x01;
-
-    /* Set pointer to GSU cache */
-    GSU.pvCache = &GSU.pvRegisters[0x100];
-
-    fx_readRegisterSpace();
-}
-
-static uint8 fx_checkStartAddress()
-{
-    /* Check if we start inside the cache */
-    if(GSU.bCacheActive && R15 >= GSU.vCacheBaseReg && R15 < (GSU.vCacheBaseReg+512))
-	return TRUE;
-   
-    /*  Check if we're in an unused area */
-    if(GSU.vPrgBankReg < 0x40 && R15 < 0x8000)
-	return FALSE;
-    if(GSU.vPrgBankReg >= 0x60 && GSU.vPrgBankReg <= 0x6f)
-	return FALSE;
-    if(GSU.vPrgBankReg >= 0x74)
-	return FALSE;
-
-    /* Check if we're in RAM and the RAN flag is not set */
-    if(GSU.vPrgBankReg >= 0x70 && GSU.vPrgBankReg <= 0x73 && !(SCMR&(1<<3)) )
-	return FALSE;
-
-    /* If not, we're in ROM, so check if the RON flag is set */
-    if(!(SCMR&(1<<4)))
-	return FALSE;
-    
-    return TRUE;
-}
-
-/* Execute until the next stop instruction */
-int FxEmulate(uint32 nInstructions)
-{
-    uint32 vCount;
-
-    /* Read registers and initialize GSU session */
-    fx_readRegisterSpace();
-
-    /* Check if the start address is valid */
-    if(!fx_checkStartAddress())
-    {
-	CF(G);
-	fx_writeRegisterSpace();
-#if 0
-	GSU.vIllegalAddress = (GSU.vPrgBankReg << 24) | R15;
-	return FX_ERROR_ILLEGAL_ADDRESS;
-#else
-	return 0;
-#endif
-    }
-
-    /* Execute GSU session */
-    CF(IRQ);
-
-    if(GSU.bBreakPoint)
-	vCount = fx_ppfFunctionTable[FX_FUNCTION_RUN_TO_BREAKPOINT](nInstructions);
-    else
-	vCount = fx_ppfFunctionTable[FX_FUNCTION_RUN](nInstructions);
-
-    /* Store GSU registers */
-    fx_writeRegisterSpace();
-
-    /* Check for error code */
-    if(GSU.vErrorCode)
-	return GSU.vErrorCode;
-    else
-	return vCount;
-}
-
-/* Breakpoints */
-void FxBreakPointSet(uint32 vAddress)
-{
-    GSU.bBreakPoint = TRUE;
-    GSU.vBreakPoint = USEX16(vAddress);
-}
-void FxBreakPointClear()
-{
-    GSU.bBreakPoint = FALSE;
-}
-
-/* Step by step execution */
-int FxStepOver(uint32 nInstructions)
-{
-    uint32 vCount;
-    fx_readRegisterSpace();
-
-    /* Check if the start address is valid */
-    if(!fx_checkStartAddress())
-    {
-	CF(G);
-#if 0
-	GSU.vIllegalAddress = (GSU.vPrgBankReg << 24) | R15;
-	return FX_ERROR_ILLEGAL_ADDRESS;
-#else
-	return 0;
-#endif
-    }
-    
-    if( PIPE >= 0xf0 )
-	GSU.vStepPoint = USEX16(R15+3);
-    else if( (PIPE >= 0x05 && PIPE <= 0x0f) || (PIPE >= 0xa0 && PIPE <= 0xaf) )
-	GSU.vStepPoint = USEX16(R15+2);
-    else
-	GSU.vStepPoint = USEX16(R15+1);
-    vCount = fx_ppfFunctionTable[FX_FUNCTION_STEP_OVER](nInstructions);
-    fx_writeRegisterSpace();
-    if(GSU.vErrorCode)
-	return GSU.vErrorCode;
-    else
-	return vCount;
-}
-
-/* Errors */
-int FxGetErrorCode()
-{
-    return GSU.vErrorCode;
-}
-
-int FxGetIllegalAddress()
-{
-    return GSU.vIllegalAddress;
-}
-
-/* Access to internal registers */
-uint32 FxGetColorRegister()
-{
-    return GSU.vColorReg & 0xff;
-}
-
-uint32 FxGetPlotOptionRegister()
-{
-    return GSU.vPlotOptionReg & 0x1f;
-}
-
-uint32 FxGetSourceRegisterIndex()
-{
-    return GSU.pvSreg - GSU.avReg;
-}
-
-uint32 FxGetDestinationRegisterIndex()
-{
-    return GSU.pvDreg - GSU.avReg;
-}
-
-uint8 FxPipe()
-{
-    return GSU.vPipe;
-}
-