From 6fb0c7a7a53e1eba7a0f5dc5b1ade312a0d76119 Mon Sep 17 00:00:00 2001
From: Toad King
Date: Thu, 14 Jun 2012 03:21:06 -0400
Subject: initial pocketsnes commit

---
 src/sa1.cpp | 775 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 775 insertions(+)
 create mode 100644 src/sa1.cpp

(limited to 'src/sa1.cpp')

diff --git a/src/sa1.cpp b/src/sa1.cpp
new file mode 100644
index 0000000..9bd0f8f
--- /dev/null
+++ b/src/sa1.cpp
@@ -0,0 +1,775 @@
+/*
+ * Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
+ *
+ * (c) Copyright 1996 - 2001 Gary Henderson (gary.henderson@ntlworld.com) and
+ *                           Jerremy Koot (jkoot@snes9x.com)
+ *
+ * Super FX C emulator code 
+ * (c) Copyright 1997 - 1999 Ivar (ivar@snes9x.com) and
+ *                           Gary Henderson.
+ * Super FX assembler emulator code (c) Copyright 1998 zsKnight and _Demo_.
+ *
+ * DSP1 emulator code (c) Copyright 1998 Ivar, _Demo_ and Gary Henderson.
+ * C4 asm and some C emulation code (c) Copyright 2000 zsKnight and _Demo_.
+ * C4 C code (c) Copyright 2001 Gary Henderson (gary.henderson@ntlworld.com).
+ *
+ * DOS port code 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.
+ */
+
+#ifdef USE_SA1
+
+#include "snes9x.h"
+#include "ppu.h"
+#include "cpuexec.h"
+
+#include "sa1.h"
+
+static void S9xSA1CharConv2 ();
+static void S9xSA1DMA ();
+static void S9xSA1ReadVariableLengthData (bool8 inc, bool8 no_shift);
+
+void S9xSA1Init ()
+{
+    SA1.NMIActive = FALSE;
+    SA1.IRQActive = FALSE;
+    SA1.WaitingForInterrupt = FALSE;
+    SA1.Waiting = FALSE;
+    SA1.Flags = 0;
+    SA1.Executing = FALSE;
+    memset (&Memory.FillRAM [0x2200], 0, 0x200);
+    Memory.FillRAM [0x2200] = 0x20;
+    Memory.FillRAM [0x2220] = 0x00;
+    Memory.FillRAM [0x2221] = 0x01;
+    Memory.FillRAM [0x2222] = 0x02;
+    Memory.FillRAM [0x2223] = 0x03;
+    Memory.FillRAM [0x2228] = 0xff;
+    SA1.op1 = 0;
+    SA1.op2 = 0;
+    SA1.arithmetic_op = 0;
+    SA1.sum = 0;
+    SA1.overflow = FALSE;
+}
+
+void S9xSA1Reset ()
+{
+    SA1Registers.PB = 0;
+    SA1Registers.PC = Memory.FillRAM [0x2203] |
+		      (Memory.FillRAM [0x2204] << 8);
+    SA1Registers.D.W = 0;
+    SA1Registers.DB = 0;
+    SA1Registers.SH = 1;
+    SA1Registers.SL = 0xFF;
+    SA1Registers.XH = 0;
+    SA1Registers.YH = 0;
+    SA1Registers.P.W = 0;
+
+    SA1.ShiftedPB = 0;
+    SA1.ShiftedDB = 0;
+    SA1SetFlags (MemoryFlag | IndexFlag | IRQ | Emulation);
+    SA1ClearFlags (Decimal);
+
+    SA1.WaitingForInterrupt = FALSE;
+    SA1.PC = NULL;
+    SA1.PCBase = NULL;
+    S9xSA1SetPCBase (SA1Registers.PC);
+    SA1.S9xOpcodes = S9xSA1OpcodesM1X1;
+
+    S9xSA1UnpackStatus();
+    S9xSA1FixCycles ();
+    SA1.Executing = TRUE;
+    SA1.BWRAM = Memory.SRAM;
+    Memory.FillRAM [0x2225] = 0;
+}
+
+void S9xSA1SetBWRAMMemMap (uint8 val)
+{
+    int c;
+
+    if (val & 0x80)
+    {
+	for (c = 0; c < 0x400; c += 16)
+	{
+	    SA1_Map [c + 6] = SA1_Map [c + 0x806] = (uint8 *) CMemory::MAP_BWRAM_BITMAP2;
+	    SA1_Map [c + 7] = SA1_Map [c + 0x807] = (uint8 *) CMemory::MAP_BWRAM_BITMAP2;
+	    SA1_WriteMap [c + 6] = SA1_WriteMap [c + 0x806] = (uint8 *) CMemory::MAP_BWRAM_BITMAP2;
+	    SA1_WriteMap [c + 7] = SA1_WriteMap [c + 0x807] = (uint8 *) CMemory::MAP_BWRAM_BITMAP2;
+	}
+	SA1.BWRAM = Memory.SRAM + (val & 0x7f) * 0x2000 / 4;
+    }
+    else
+    {
+	for (c = 0; c < 0x400; c += 16)
+	{
+	    SA1_Map [c + 6] = SA1_Map [c + 0x806] = (uint8 *) CMemory::MAP_BWRAM;
+	    SA1_Map [c + 7] = SA1_Map [c + 0x807] = (uint8 *) CMemory::MAP_BWRAM;
+	    SA1_WriteMap [c + 6] = SA1_WriteMap [c + 0x806] = (uint8 *) CMemory::MAP_BWRAM;
+	    SA1_WriteMap [c + 7] = SA1_WriteMap [c + 0x807] = (uint8 *) CMemory::MAP_BWRAM;
+	}
+	SA1.BWRAM = Memory.SRAM + (val & 7) * 0x2000;
+    }
+}
+
+void S9xFixSA1AfterSnapshotLoad ()
+{
+    SA1.ShiftedPB = (uint32) SA1Registers.PB << 16;
+    SA1.ShiftedDB = (uint32) SA1Registers.DB << 16;
+
+    S9xSA1SetPCBase (SA1.ShiftedPB + SA1Registers.PC);
+    S9xSA1UnpackStatus ();
+    S9xSA1FixCycles ();
+    SA1.VirtualBitmapFormat = (Memory.FillRAM [0x223f] & 0x80) ? 2 : 4;
+    Memory.BWRAM = Memory.SRAM + (Memory.FillRAM [0x2224] & 7) * 0x2000;
+    S9xSA1SetBWRAMMemMap (Memory.FillRAM [0x2225]);
+
+    SA1.Waiting = (Memory.FillRAM [0x2200] & 0x60) != 0;
+    SA1.Executing = !SA1.Waiting;
+}
+
+// SA9xSA1GetByte --- begin
+static uint8 S9xSA1GetByte_default (uint32 address) {
+#ifdef DEBUGGER
+//	printf ("R(B) %06x\n", address);
+#endif
+	return (0);
+}
+static uint8 S9xSA1GetByte_PPU (uint32 address) {
+	return (S9xGetSA1 (address & 0xffff));
+}
+static uint8 S9xSA1GetByte_SA1RAM (uint32 address) {
+	return (*(Memory.SRAM + (address & 0xffff)));
+}
+static uint8 S9xSA1GetByte_BWRAM (uint32 address) {
+	return (*(SA1.BWRAM + ((address & 0x7fff) - 0x6000)));
+}
+static uint8 S9xSA1GetByte_BWRAM_BITMAP (uint32 address) {
+	address -= 0x600000;
+	if (SA1.VirtualBitmapFormat == 2)
+	    return ((Memory.SRAM [(address >> 2) & 0xffff] >> ((address & 3) << 1)) & 3);
+	else
+	    return ((Memory.SRAM [(address >> 1) & 0xffff] >> ((address & 1) << 2)) & 15);
+}
+static uint8 S9xSA1GetByte_BWRAM_BITMAP2 (uint32 address) {
+	address = (address & 0xffff) - 0x6000;
+	if (SA1.VirtualBitmapFormat == 2)
+	    return ((SA1.BWRAM [(address >> 2) & 0xffff] >> ((address & 3) << 1)) & 3);
+	else
+	    return ((SA1.BWRAM [(address >> 1) & 0xffff] >> ((address & 1) << 2)) & 15);
+}
+
+// GetByte JumpTable for Memmory map modes
+uint8 (*S9xSA1GetByte_JumpTable[(1 << (16 - 12))]) (uint32 address) = {
+	S9xSA1GetByte_PPU, // MAP_PPU 
+	S9xSA1GetByte_default, // MAP_CPU
+	S9xSA1GetByte_default, // MAP_DSP
+	S9xSA1GetByte_SA1RAM, // MAP_LOROM_SRAM
+	S9xSA1GetByte_default, // MAP_HIROM_SRAM
+	S9xSA1GetByte_default, // MAP_NONE
+	S9xSA1GetByte_default, // MAP_DEBUG
+	S9xSA1GetByte_default, // MAP_C4
+	S9xSA1GetByte_BWRAM, // MAP_BWRAM
+	S9xSA1GetByte_BWRAM_BITMAP, // MAP_BWRAM_BITMAP
+	S9xSA1GetByte_BWRAM_BITMAP2, // MAP_BWRAM_BITMAP2
+	S9xSA1GetByte_SA1RAM, // MAP_SA1RAM
+	S9xSA1GetByte_default, // MAP_LAST
+	S9xSA1GetByte_default, // MAP_LAST+1
+	S9xSA1GetByte_default, // MAP_LAST+2
+	S9xSA1GetByte_default  // MAP_LAST+3
+};  
+
+uint8 S9xSA1GetByte (uint32 address)
+{
+    uint8 *GetAddress = SA1_Map [(address >> MEMMAP_SHIFT) & MEMMAP_MASK];
+    if (GetAddress >= (uint8 *) CMemory::MAP_LAST) return (*(GetAddress + (address & 0xffff)));
+    return S9xSA1GetByte_JumpTable[(int) GetAddress](address);
+//	return (SA1_Map [(address >> MEMMAP_SHIFT) & MEMMAP_MASK] >= (uint8 *)CMemory::MAP_LAST) ? 
+//		(*((uint8 *)(SA1_Map [(address >> MEMMAP_SHIFT) & MEMMAP_MASK]) + (address & 0xffff))) : 
+//		S9xSA1GetByte_JumpTable[(int) SA1_Map [(address >> MEMMAP_SHIFT) & MEMMAP_MASK]](address); 
+}
+
+/*
+uint16 S9xSA1GetWord (uint32 address)
+{
+    uint8 *GetAddress = SA1_Map [(address >> MEMMAP_SHIFT) & MEMMAP_MASK];
+    if (GetAddress >= (uint8 *) CMemory::MAP_LAST)
+	return (*(GetAddress + (address & 0xffff))) | ((*(GetAddress + ((address+1) & 0xffff))) << 8);
+    return (S9xSA1GetByte_JumpTable[(int) GetAddress](address)) | ((S9xSA1GetByte_JumpTable[(int) GetAddress](address+1)) << 8);
+}
+*/
+// SA9xSA1SetByte --- begin
+static void S9xSA1SetByte_default (uint8 byte, uint32 address) {
+}
+static void S9xSA1SetByte_PPU (uint8 byte, uint32 address) {
+	S9xSetSA1 (byte, address & 0xffff);
+}
+static void S9xSA1SetByte_SA1RAM (uint8 byte, uint32 address) {
+	*(Memory.SRAM + (address & 0xffff)) = byte;
+}
+static void S9xSA1SetByte_BWRAM (uint8 byte, uint32 address) {
+	*(SA1.BWRAM + ((address & 0x7fff) - 0x6000)) = byte;
+}
+static void S9xSA1SetByte_BWRAM_BITMAP (uint8 byte, uint32 address) {
+	uint8 *ptr;	
+	address -= 0x600000;
+	if (SA1.VirtualBitmapFormat == 2) {
+	    ptr = &Memory.SRAM [(address >> 2) & 0xffff];
+	    *ptr &= ~(3 << ((address & 3) << 1));
+	    *ptr |= (byte & 3) << ((address & 3) << 1);
+	} else {
+	    ptr = &Memory.SRAM [(address >> 1) & 0xffff];
+	    *ptr &= ~(15 << ((address & 1) << 2));
+	    *ptr |= (byte & 15) << ((address & 1) << 2);
+	}
+	address -= 0x600000;
+}
+static void S9xSA1SetByte_BWRAM_BITMAP2 (uint8 byte, uint32 address) {
+	uint8 *ptr;	
+	address = (address & 0xffff) - 0x6000;
+	if (SA1.VirtualBitmapFormat == 2)
+	{
+	    ptr = &SA1.BWRAM [(address >> 2) & 0xffff];
+	    *ptr &= ~(3 << ((address & 3) << 1));
+	    *ptr |= (byte & 3) << ((address & 3) << 1);
+	}
+	else
+	{
+	    ptr = &SA1.BWRAM [(address >> 1) & 0xffff];
+	    *ptr &= ~(15 << ((address & 1) << 2));
+	    *ptr |= (byte & 15) << ((address & 1) << 2);
+	}
+}
+
+// SetByte JumpTable for Memmory map modes
+void (*S9xSA1SetByte_JumpTable[(1 << (16 - 12))]) (uint8 byte, uint32 address) = {
+	S9xSA1SetByte_PPU, // MAP_PPU 
+	S9xSA1SetByte_default, // MAP_CPU
+	S9xSA1SetByte_default, // MAP_DSP
+	S9xSA1SetByte_SA1RAM, // MAP_LOROM_SRAM
+	S9xSA1SetByte_default, // MAP_HIROM_SRAM
+	S9xSA1SetByte_default, // MAP_NONE
+	S9xSA1SetByte_default, // MAP_DEBUG
+	S9xSA1SetByte_default, // MAP_C4
+	S9xSA1SetByte_BWRAM, // MAP_BWRAM
+	S9xSA1SetByte_BWRAM_BITMAP, // MAP_BWRAM_BITMAP
+	S9xSA1SetByte_BWRAM_BITMAP2, // MAP_BWRAM_BITMAP2
+	S9xSA1SetByte_SA1RAM, // MAP_SA1RAM
+	S9xSA1SetByte_default, // MAP_LAST
+	S9xSA1SetByte_default, // MAP_LAST+1
+	S9xSA1SetByte_default, // MAP_LAST+2
+	S9xSA1SetByte_default  // MAP_LAST+3
+};  
+
+void S9xSA1SetByte (uint8 byte, uint32 address)
+{
+	// MEMMAP_SHIFT 12
+	// MEMMAP_MASK 0xFFF
+
+    uint8 *Setaddress = SA1_WriteMap [(address >> MEMMAP_SHIFT) & MEMMAP_MASK];
+    if (Setaddress >= (uint8 *) CMemory::MAP_LAST)
+    {
+	*(Setaddress + (address & 0xffff)) = byte;
+	return;
+    }
+    S9xSA1SetByte_JumpTable[(int)Setaddress](byte, address);
+}
+
+void S9xSA1SetPCBase (uint32 address)
+{
+    uint8 *GetAddress = SA1_Map [(address >> MEMMAP_SHIFT) & MEMMAP_MASK];
+    if (GetAddress >= (uint8 *) CMemory::MAP_LAST)
+    {
+	SA1.PCBase = GetAddress;
+	SA1.PC = GetAddress + (address & 0xffff);
+	return;
+    }
+
+    switch ((int) GetAddress)
+    {
+    case CMemory::MAP_PPU:
+	SA1.PCBase = Memory.FillRAM - 0x2000;
+	SA1.PC = SA1.PCBase + (address & 0xffff);
+	return;
+	
+    case CMemory::MAP_CPU:
+	SA1.PCBase = Memory.FillRAM - 0x4000;
+	SA1.PC = SA1.PCBase + (address & 0xffff);
+	return;
+	
+    case CMemory::MAP_DSP:
+	SA1.PCBase = Memory.FillRAM - 0x6000;
+	SA1.PC = SA1.PCBase + (address & 0xffff);
+	return;
+	
+    case CMemory::MAP_SA1RAM:
+    case CMemory::MAP_LOROM_SRAM:
+	SA1.PCBase = Memory.SRAM;
+	SA1.PC = SA1.PCBase + (address & 0xffff);
+	return;
+
+    case CMemory::MAP_BWRAM:
+	SA1.PCBase = SA1.BWRAM - 0x6000;
+	SA1.PC = SA1.PCBase + (address & 0xffff);
+	return;
+    case CMemory::MAP_HIROM_SRAM:
+	SA1.PCBase = Memory.SRAM - 0x6000;
+	SA1.PC = SA1.PCBase + (address & 0xffff);
+	return;
+
+    case CMemory::MAP_DEBUG:
+#ifdef DEBUGGER
+	printf ("SBP %06x\n", address);
+#endif
+	
+    default:
+    case CMemory::MAP_NONE:
+	SA1.PCBase = Memory.RAM;
+	SA1.PC = Memory.RAM + (address & 0xffff);
+	return;
+    }
+}
+
+void S9xSA1ExecuteDuringSleep ()
+{
+}
+
+void S9xSetSA1MemMap (uint32 which1, uint8 map)
+{
+    int c;
+    int start = which1 * 0x100 + 0xc00;
+    int start2 = which1 * 0x200;
+	uint8 *block;
+	int i;
+
+    if (which1 >= 2)
+	start2 += 0x400;
+
+    for (c = 0; c < 0x100; c += 16)
+    {
+	block = &Memory.ROM [(map & 7) * 0x100000 + (c << 12)];
+	for (i = c; i < c + 16; i++)
+	    Memory.Map [start + i] = SA1_Map [start + i] = block;
+    }
+    
+    for (c = 0; c < 0x200; c += 16)
+    {
+	block = &Memory.ROM [(map & 7) * 0x100000 + (c << 11) - 0x8000];
+	for (i = c + 8; i < c + 16; i++)
+	    Memory.Map [start2 + i] = SA1_Map [start2 + i] = block;
+    }
+}
+
+uint8 S9xGetSA1 (uint32 address)
+{
+    if ((address < 0x2300) && (address > 0x230d)) return (Memory.FillRAM [address]);
+    switch (address)
+    {
+    case 0x2300:
+		return ((uint8) ((Memory.FillRAM [0x2209] & 0x5f) | 
+		 (CPU.IRQActive & (SA1_IRQ_SOURCE | SA1_DMA_IRQ_SOURCE))));
+    case 0x2301:
+		return ((Memory.FillRAM [0x2200] & 0xf) |
+		(Memory.FillRAM [0x2301] & 0xf0));
+    case 0x2306:
+		return ((uint8)  SA1.sum);
+    case 0x2307:
+		return ((uint8) (SA1.sum >>  8));
+    case 0x2308:
+		return ((uint8) (SA1.sum >> 16));
+    case 0x2309:
+		return ((uint8) (SA1.sum >> 24));
+    case 0x230a:
+		return ((uint8) (SA1.sum >> 32));
+    case 0x230b:
+		return (Memory.FillRAM [address]);
+    case 0x230c:
+		return (Memory.FillRAM [0x230c]);
+    case 0x230d:
+    {
+			uint8 byte = Memory.FillRAM [0x230d];
+		
+			if (Memory.FillRAM [0x2258] & 0x80)
+			{
+			    S9xSA1ReadVariableLengthData (TRUE, FALSE);
+			}
+			return (byte);
+    }
+    }
+    
+}
+
+void S9xSetSA1 (uint8 byte, uint32 address)
+{
+  
+    if (address < 0x2200 || address > 0x22ff) return;
+
+    switch (address)
+    {
+    case 0x2200:
+		SA1.Waiting = (byte & 0x60) != 0;
+	
+		if (!(byte & 0x20) && (Memory.FillRAM [0x2200] & 0x20))
+		{
+		    S9xSA1Reset ();
+		}
+		if (byte & 0x80)
+		{
+		    Memory.FillRAM [0x2301] |= 0x80;
+		    if (Memory.FillRAM [0x220a] & 0x80)
+		    {
+					SA1.Flags |= IRQ_PENDING_FLAG;
+					SA1.IRQActive |= SNES_IRQ_SOURCE;
+					SA1.Executing = !SA1.Waiting && SA1.S9xOpcodes;
+		    }
+		}
+		if (byte & 0x10)
+		{
+		    Memory.FillRAM [0x2301] |= 0x10;
+		}
+		break;
+
+    case 0x2201:
+		if (((byte ^ Memory.FillRAM [0x2201]) & 0x80) &&
+		    (Memory.FillRAM [0x2300] & byte & 0x80))
+		{
+		    S9xSetIRQ (SA1_IRQ_SOURCE);
+		}
+		if (((byte ^ Memory.FillRAM [0x2201]) & 0x20) &&
+		    (Memory.FillRAM [0x2300] & byte & 0x20))
+		{
+		    S9xSetIRQ (SA1_DMA_IRQ_SOURCE);
+		}
+		break;
+    case 0x2202:
+		if (byte & 0x80)
+		{
+		    Memory.FillRAM [0x2300] &= ~0x80;
+		    S9xClearIRQ (SA1_IRQ_SOURCE);
+		}
+		if (byte & 0x20)
+		{
+		    Memory.FillRAM [0x2300] &= ~0x20;
+		    S9xClearIRQ (SA1_DMA_IRQ_SOURCE);
+		}
+		break;
+
+    case 0x2209:
+		Memory.FillRAM [0x2209] = byte;
+		if (byte & 0x80)
+		    Memory.FillRAM [0x2300] |= 0x80;
+	
+		if (byte & Memory.FillRAM [0x2201] & 0x80)
+		{
+		    S9xSetIRQ (SA1_IRQ_SOURCE);
+		}
+		return;
+    case 0x220a:
+		if (((byte ^ Memory.FillRAM [0x220a]) & 0x80) &&
+		    (Memory.FillRAM [0x2301] & byte & 0x80))
+		{
+		    SA1.Flags |= IRQ_PENDING_FLAG;
+		    SA1.IRQActive |= SNES_IRQ_SOURCE;
+		}
+		if (((byte ^ Memory.FillRAM [0x220a]) & 0x40) &&
+		    (Memory.FillRAM [0x2301] & byte & 0x40))
+		{
+		    SA1.Flags |= IRQ_PENDING_FLAG;
+		    SA1.IRQActive |= TIMER_IRQ_SOURCE;
+		}
+		if (((byte ^ Memory.FillRAM [0x220a]) & 0x20) &&
+		    (Memory.FillRAM [0x2301] & byte & 0x20))
+		{
+		    SA1.Flags |= IRQ_PENDING_FLAG;
+		    SA1.IRQActive |= DMA_IRQ_SOURCE;
+		}
+		if (((byte ^ Memory.FillRAM [0x220a]) & 0x10) &&
+		    (Memory.FillRAM [0x2301] & byte & 0x10))
+		{
+		}
+		break;
+    case 0x220b:
+		if (byte & 0x80)
+		{
+		    SA1.IRQActive &= ~SNES_IRQ_SOURCE;
+		    Memory.FillRAM [0x2301] &= ~0x80;
+		}
+		if (byte & 0x40)
+		{
+		    SA1.IRQActive &= ~TIMER_IRQ_SOURCE;
+		    Memory.FillRAM [0x2301] &= ~0x40;
+		}
+		if (byte & 0x20)
+		{
+		    SA1.IRQActive &= ~DMA_IRQ_SOURCE;
+		    Memory.FillRAM [0x2301] &= ~0x20;
+		}
+		if (byte & 0x10)
+		{
+		    // Clear NMI
+		    Memory.FillRAM [0x2301] &= ~0x10;
+		}
+		if (!SA1.IRQActive)
+		    SA1.Flags &= ~IRQ_PENDING_FLAG;
+		break;
+    case 0x2220:
+    case 0x2221:
+    case 0x2222:
+    case 0x2223:
+		S9xSetSA1MemMap (address - 0x2220, byte);
+		break;
+    case 0x2224:
+		Memory.BWRAM = Memory.SRAM + (byte & 7) * 0x2000;
+		break;
+    case 0x2225:
+		if (byte != Memory.FillRAM [address])
+		    S9xSA1SetBWRAMMemMap (byte);
+		break;
+    case 0x2231:
+		if (byte & 0x80)
+		    SA1.in_char_dma = FALSE;
+		break;
+    case 0x2236:
+		Memory.FillRAM [address] = byte;
+		if ((Memory.FillRAM [0x2230] & 0xa4) == 0x80)
+		{
+		    // Normal DMA to I-RAM
+		    S9xSA1DMA ();
+		}
+		else
+		if ((Memory.FillRAM [0x2230] & 0xb0) == 0xb0)
+		{
+		    Memory.FillRAM [0x2300] |= 0x20;
+		    if (Memory.FillRAM [0x2201] & 0x20)
+				S9xSetIRQ (SA1_DMA_IRQ_SOURCE);
+		    SA1.in_char_dma = TRUE;
+		}
+		return;
+    case 0x2237:
+		Memory.FillRAM [address] = byte;
+		if ((Memory.FillRAM [0x2230] & 0xa4) == 0x84)
+		{
+		    // Normal DMA to BW-RAM
+		    S9xSA1DMA ();
+		}
+		return;
+    case 0x223f:
+		SA1.VirtualBitmapFormat = (byte & 0x80) ? 2 : 4;
+		break;
+
+    case 0x224f:
+		Memory.FillRAM [address] = byte;
+		if ((Memory.FillRAM [0x2230] & 0xb0) == 0xa0)
+		{
+		    // Char conversion 2 DMA enabled
+		    memmove (&Memory.ROM [CMemory::MAX_ROM_SIZE - 0x10000] + (SA1.in_char_dma << 4),
+			     &Memory.FillRAM [0x2240], 16);
+		    SA1.in_char_dma = (SA1.in_char_dma + 1) & 7;
+		    if ((SA1.in_char_dma & 3) == 0)
+		    {
+					S9xSA1CharConv2 ();
+		    }
+		}
+		return;
+    case 0x2250:
+		if (byte & 2)
+		  SA1.sum = 0;
+			SA1.arithmetic_op = byte & 3;
+		break;
+    
+    case 0x2251:
+		SA1.op1 = (SA1.op1 & 0xff00) | byte;
+		break;
+    case 0x2252:
+		SA1.op1 = (SA1.op1 & 0xff) | (byte << 8);
+		break;
+    case 0x2253:
+		SA1.op2 = (SA1.op2 & 0xff00) | byte;
+		break;
+    case 0x2254:
+		SA1.op2 = (SA1.op2 & 0xff) | (byte << 8);
+		switch (SA1.arithmetic_op)
+		{
+    		case 0:	// multiply
+		    SA1.sum = SA1.op1 * SA1.op2;
+		    break;
+				case 1: // divide
+		    if (SA1.op2 == 0)
+				SA1.sum = SA1.op1 << 16;
+		    else
+		    {
+					unsigned int x = (SA1.op1 / (int) ((uint16) SA1.op2));
+					SA1.sum = x | ((SA1.op1 - (x * (uint16) SA1.op2)) << 16);
+				//	SA1.sum = (SA1.op1 / (int) ((uint16) SA1.op2)) |
+				  //((SA1.op1 % (int) ((uint16) SA1.op2)) << 16);
+		    }
+		    break;
+				default: // cumulative sum
+		    SA1.sum += SA1.op1 * SA1.op2;
+		    if (SA1.sum & ((int64) 0xffffff << 32))
+					SA1.overflow = TRUE;
+		    break;
+		}
+		break;
+    case 0x2258:    // Variable bit-field length/auto inc/start.
+		Memory.FillRAM [0x2258] = byte;
+		S9xSA1ReadVariableLengthData (TRUE, FALSE);
+		return;
+    case 0x2259:
+    case 0x225a:
+    case 0x225b:    // Variable bit-field start address
+		Memory.FillRAM [address] = byte;
+		// XXX: ???
+		SA1.variable_bit_pos = 0;
+		S9xSA1ReadVariableLengthData (FALSE, TRUE);
+		return;
+    }
+  	if (address >= 0x2200 && address <= 0x22ff)
+			Memory.FillRAM [address] = byte;
+}
+
+static void S9xSA1CharConv2 ()
+{
+    uint32 dest = Memory.FillRAM [0x2235] | (Memory.FillRAM [0x2236] << 8);
+    uint32 offset = (SA1.in_char_dma & 7) ? 0 : 1;
+    int depth = (Memory.FillRAM [0x2231] & 3) == 0 ? 8 :
+		(Memory.FillRAM [0x2231] & 3) == 1 ? 4 : 2;
+    int bytes_per_char = 8 * depth;
+    uint8 *p = &Memory.FillRAM [0x3000] + dest + offset * bytes_per_char;
+    uint8 *q = &Memory.ROM [CMemory::MAX_ROM_SIZE - 0x10000] + offset * 64;
+
+    if (depth == 8)
+    {
+	 		for (int l = 0; l < 8; l++, q += 8)
+			{
+		    for (int b = 0; b < 8; b++)
+		    {
+					uint8 r = *(q + b);
+					*(p +  0) = (*(p +  0) << 1) | ((r >> 0) & 1);
+					*(p +  1) = (*(p +  1) << 1) | ((r >> 1) & 1);
+					*(p + 16) = (*(p + 16) << 1) | ((r >> 2) & 1);
+					*(p + 17) = (*(p + 17) << 1) | ((r >> 3) & 1);
+					*(p + 32) = (*(p + 32) << 1) | ((r >> 4) & 1);
+					*(p + 33) = (*(p + 33) << 1) | ((r >> 5) & 1);
+					*(p + 48) = (*(p + 48) << 1) | ((r >> 6) & 1);
+					*(p + 49) = (*(p + 49) << 1) | ((r >> 7) & 1);
+		    }
+		    p += 2;
+			}
+	   }
+}
+
+static void S9xSA1DMA ()
+{
+    uint32 src =  Memory.FillRAM [0x2232] |
+	         (Memory.FillRAM [0x2233] << 8) |
+		 (Memory.FillRAM [0x2234] << 16);
+    uint32 dst =  Memory.FillRAM [0x2235] |
+	         (Memory.FillRAM [0x2236] << 8) |
+		 (Memory.FillRAM [0x2237] << 16);
+    uint32 len =  Memory.FillRAM [0x2238] |
+		 (Memory.FillRAM [0x2239] << 8);
+
+    uint8 *s;
+    uint8 *d;
+
+    switch (Memory.FillRAM [0x2230] & 3)
+    {
+    case 0: // ROM
+	s = SA1_Map [(src >> MEMMAP_SHIFT) & MEMMAP_MASK];
+	if (s >= (uint8 *) CMemory::MAP_LAST)
+	    s += (src & 0xffff);
+	else
+	    s = Memory.ROM + (src & 0xffff);
+	break;
+    case 1: // BW-RAM
+	src &= CPU.Memory_SRAMMask;
+	len &= CPU.Memory_SRAMMask;
+	s = Memory.SRAM + src;
+	break;
+    default:
+    case 2:
+	src &= 0x3ff;
+	len &= 0x3ff;
+	s = &Memory.FillRAM [0x3000] + src;
+	break;
+    }
+
+    if (Memory.FillRAM [0x2230] & 4)
+    {
+	dst &= CPU.Memory_SRAMMask;
+	len &= CPU.Memory_SRAMMask;
+	d = Memory.SRAM + dst;
+    }
+    else
+    {
+	dst &= 0x3ff;
+	len &= 0x3ff;
+	d = &Memory.FillRAM [0x3000] + dst;
+    }
+    memmove (d, s, len);
+    Memory.FillRAM [0x2301] |= 0x20;
+    
+    if (Memory.FillRAM [0x220a] & 0x20)
+    {
+			SA1.Flags |= IRQ_PENDING_FLAG;
+			SA1.IRQActive |= DMA_IRQ_SOURCE;
+    }
+}
+
+void S9xSA1ReadVariableLengthData (bool8 inc, bool8 no_shift)
+{
+    uint32 addr =  Memory.FillRAM [0x2259] |
+		  (Memory.FillRAM [0x225a] << 8) |
+		  (Memory.FillRAM [0x225b] << 16);
+    uint8 shift = Memory.FillRAM [0x2258] & 15;
+
+    if (no_shift)
+			shift = 0;
+    else
+    if (shift == 0)
+			shift = 16;
+
+    uint8 s = shift + SA1.variable_bit_pos;
+
+    if (s >= 16)
+    {
+			addr += (s >> 4) << 1;
+			s &= 15;
+    }
+    uint32 data = S9xSA1GetWord (addr) |
+		  (S9xSA1GetWord (addr + 2) << 16);
+
+    data >>= s;
+    Memory.FillRAM [0x230c] = (uint8) data;
+    Memory.FillRAM [0x230d] = (uint8) (data >> 8);
+    if (inc)
+    {
+			SA1.variable_bit_pos = (SA1.variable_bit_pos + shift) & 15;
+			Memory.FillRAM [0x2259] = (uint8) addr;
+			Memory.FillRAM [0x225a] = (uint8) (addr >> 8);
+			Memory.FillRAM [0x225b] = (uint8) (addr >> 16);
+    }
+}
+
+#endif // USE_SA1
-- 
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