1 // This is part of Pico Library
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3 // (c) Copyright 2004 Dave, All rights reserved.
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4 // (c) Copyright 2006 notaz, All rights reserved.
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5 // Free for non-commercial use.
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7 // For commercial use, separate licencing terms must be obtained.
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10 //#define __debug_io
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12 #include "PicoInt.h"
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14 #include "sound/sound.h"
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15 #include "sound/ym2612.h"
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16 #include "sound/sn76496.h"
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18 typedef unsigned char u8;
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19 typedef unsigned short u16;
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20 typedef unsigned int u32;
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22 extern unsigned int lastSSRamWrite; // used by serial SRAM code
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24 #ifdef _ASM_MEMORY_C
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25 u8 PicoRead8(u32 a);
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26 u16 PicoRead16(u32 a);
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27 void PicoWriteRomHW_SSF2(u32 a,u32 d);
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28 void PicoWriteRomHW_in1 (u32 a,u32 d);
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32 #if defined(EMU_C68K) && defined(EMU_M68K)
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33 // cyclone debug mode
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34 u32 lastread_a, lastread_d[16]={0,}, lastwrite_cyc_d[16]={0,}, lastwrite_mus_d[16]={0,};
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35 int lrp_cyc=0, lrp_mus=0, lwp_cyc=0, lwp_mus=0;
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36 extern unsigned int ppop;
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39 #if defined(EMU_C68K) || defined(EMU_A68K)
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40 static __inline int PicoMemBase(u32 pc)
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44 if (pc<Pico.romsize+4)
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46 membase=(int)Pico.rom; // Program Counter in Rom
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48 else if ((pc&0xe00000)==0xe00000)
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50 membase=(int)Pico.ram-(pc&0xff0000); // Program Counter in Ram
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54 // Error - Program Counter is invalid
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55 membase=(int)Pico.rom;
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64 extern u8 *OP_ROM=NULL,*OP_RAM=NULL;
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67 static u32 CPU_CALL PicoCheckPc(u32 pc)
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70 #if defined(EMU_C68K)
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71 pc-=PicoCpu.membase; // Get real pc
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74 return (int)Pico.rom + Pico.romsize; // common crash condition, can happen if acc timing is off
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76 PicoCpu.membase=PicoMemBase(pc);
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78 ret = PicoCpu.membase+pc;
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79 #elif defined(EMU_A68K)
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80 OP_ROM=(u8 *)PicoMemBase(pc);
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82 // don't bother calling us back unless it's outside the 64k segment
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83 M68000_regs.AsmBank=(pc>>16);
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89 int PicoInitPc(u32 pc)
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95 #ifndef _ASM_MEMORY_C
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101 // -----------------------------------------------------------------
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103 #ifndef _ASM_MEMORY_C
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104 // address must already be checked
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105 static int SRAMRead(u32 a)
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107 u8 *d = SRam.data-SRam.start+a;
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108 return (d[0]<<8)|d[1];
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113 // for nonstandard reads
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114 #ifndef _ASM_MEMORY_C
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117 u32 OtherRead16End(u32 a, int realsize)
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121 dprintf("strange r%i: %06x @%06x", realsize, a&0xffffff, SekPc);
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123 // for games with simple protection devices, discovered by Haze
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124 // some dumb detection is used, but that should be enough to make things work
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125 if ((a>>22) == 1 && Pico.romsize >= 512*1024) {
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126 if (*(int *)(Pico.rom+0x123e4) == 0x00550c39 && *(int *)(Pico.rom+0x123e8) == 0x00000040) { // Super Bubble Bobble (Unl) [!]
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127 if (a == 0x400000) { d=0x55<<8; goto end; }
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128 else if (a == 0x400002) { d=0x0f<<8; goto end; }
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130 else if (*(int *)(Pico.rom+0x008c4) == 0x66240055 && *(int *)(Pico.rom+0x008c8) == 0x00404df9) { // Smart Mouse (Unl)
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131 if (a == 0x400000) { d=0x55<<8; goto end; }
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132 else if (a == 0x400002) { d=0x0f<<8; goto end; }
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133 else if (a == 0x400004) { d=0xaa<<8; goto end; }
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134 else if (a == 0x400006) { d=0xf0<<8; goto end; }
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136 else if (*(int *)(Pico.rom+0x00404) == 0x00a90600 && *(int *)(Pico.rom+0x00408) == 0x6708b013) { // King of Fighters '98, The (Unl) [!]
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137 if (a == 0x480000 || a == 0x4800e0 || a == 0x4824a0 || a == 0x488880) { d=0xaa<<8; goto end; }
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138 else if (a == 0x4a8820) { d=0x0a<<8; goto end; }
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139 // there is also a read @ 0x4F8820 which needs 0, but that is returned in default case
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141 else if (*(int *)(Pico.rom+0x01b24) == 0x004013f9 && *(int *)(Pico.rom+0x01b28) == 0x00ff0000) { // Mahjong Lover (Unl) [!]
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142 if (a == 0x400000) { d=0x90<<8; goto end; }
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143 else if (a == 0x401000) { d=0xd3<<8; goto end; } // this one doesn't seem to be needed, the code does 2 comparisons and only then
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144 // checks the result, which is of the above one. Left it just in case.
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146 else if (*(int *)(Pico.rom+0x05254) == 0x0c3962d0 && *(int *)(Pico.rom+0x05258) == 0x00400055) { // Elf Wor (Unl)
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147 if (a == 0x400000) { d=0x55<<8; goto end; }
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148 else if (a == 0x400004) { d=0xc9<<8; goto end; } // this check is done if the above one fails
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149 else if (a == 0x400002) { d=0x0f<<8; goto end; }
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150 else if (a == 0x400006) { d=0x18<<8; goto end; } // similar to above
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152 // our default behaviour is to return whatever was last written a 0x400000-0x7fffff range (used by Squirrel King (R) [!])
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153 // Lion King II, The (Unl) [!] writes @ 400000 and wants to get that val @ 400002 and wites another val
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154 // @ 400004 which is expected @ 400006, so we really remember 2 values here
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155 d = Pico.m.prot_bytes[(a>>2)&1]<<8;
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157 else if (a == 0xa13000 && Pico.romsize >= 1024*1024) {
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158 if (*(int *)(Pico.rom+0xc8af0) == 0x30133013 && *(int *)(Pico.rom+0xc8af4) == 0x000f0240) { // Rockman X3 (Unl) [!]
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161 else if (*(int *)(Pico.rom+0x28888) == 0x07fc0000 && *(int *)(Pico.rom+0x2888c) == 0x4eb94e75) { // Bug's Life, A (Unl) [!]
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162 d=0x28; goto end; // does the check from RAM
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164 else if (*(int *)(Pico.rom+0xc8778) == 0x30133013 && *(int *)(Pico.rom+0xc877c) == 0x000f0240) { // Super Mario Bros. (Unl) [!]
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165 d=0x0c; goto end; // seems to be the same code as in Rockman X3 (Unl) [!]
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167 else if (*(int *)(Pico.rom+0xf20ec) == 0x30143013 && *(int *)(Pico.rom+0xf20f0) == 0x000f0200) { // Super Mario 2 1998 (Unl) [!]
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171 else if (a == 0xa13002) { // Pocket Monsters (Unl)
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174 else if (a == 0xa1303E) { // Pocket Monsters (Unl)
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177 else if (a == 0x30fe02) {
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178 // Virtua Racing - just for fun
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179 // this seems to be some flag that SVP is ready or something similar
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184 dprintf("ret = %04x", d);
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189 //extern UINT32 mz80GetRegisterValue(void *, UINT32);
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191 static void OtherWrite8End(u32 a,u32 d,int realsize)
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194 //if(a==0x200000) dprintf("cc : %02x @ %06x [%i|%i]", d, SekPc, SekCyclesDoneT(), SekCyclesDone());
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195 //if(a==0x200001) dprintf("w8 : %02x @ %06x [%i]", d, SekPc, SekCyclesDoneT());
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196 if(a >= SRam.start && a <= SRam.end) {
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197 dprintf("sram w%i: %06x, %08x @%06x", realsize, a&0xffffff, d, SekPc);
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198 unsigned int sreg = Pico.m.sram_reg;
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199 if(!(sreg & 0x10)) {
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200 // not detected SRAM
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201 if((a&~1)==0x200000) {
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202 Pico.m.sram_reg|=4; // this should be a game with EEPROM (like NBA Jam)
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203 SRam.start=0x200000; SRam.end=SRam.start+1;
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205 Pico.m.sram_reg|=0x10;
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207 if(sreg & 4) { // EEPROM write
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208 if(SekCyclesDoneT()-lastSSRamWrite < 46) {
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209 // just update pending state
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210 SRAMUpdPending(a, d);
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212 SRAMWriteEEPROM(sreg>>6); // execute pending
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213 SRAMUpdPending(a, d);
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214 lastSSRamWrite = SekCyclesDoneT();
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216 } else if(!(sreg & 2)) {
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217 u8 *pm=(u8 *)(SRam.data-SRam.start+a);
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226 #ifdef _ASM_MEMORY_C
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227 // special ROM hardware (currently only banking and sram reg supported)
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228 if((a&0xfffff1) == 0xA130F1) {
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229 PicoWriteRomHW_SSF2(a, d); // SSF2 or SRAM
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233 // sram access register
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234 if(a == 0xA130F1) {
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235 dprintf("sram reg=%02x", d);
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236 Pico.m.sram_reg &= ~3;
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237 Pico.m.sram_reg |= (u8)(d&3);
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241 dprintf("strange w%i: %06x, %08x @%06x", realsize, a&0xffffff, d, SekPc);
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243 if(a >= 0xA13004 && a < 0xA13040) {
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244 // dumb 12-in-1 or 4-in-1 banking support
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246 a &= 0x3f; a <<= 16;
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247 len = Pico.romsize - a;
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248 if (len <= 0) return; // invalid/missing bank
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249 if (len > 0x200000) len = 0x200000; // 2 megs
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250 memcpy(Pico.rom, Pico.rom+a, len); // code which does this is in RAM so this is safe.
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254 // for games with simple protection devices, discovered by Haze
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255 else if ((a>>22) == 1)
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256 Pico.m.prot_bytes[(a>>2)&1] = (u8)d;
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260 #include "MemoryCmn.c"
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263 // -----------------------------------------------------------------
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264 // Read Rom and read Ram
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266 #ifndef _ASM_MEMORY_C
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267 u8 CPU_CALL PicoRead8(u32 a)
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271 if ((a&0xe00000)==0xe00000) { d = *(u8 *)(Pico.ram+((a^1)&0xffff)); goto end; } // Ram
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275 #if !(defined(EMU_C68K) && defined(EMU_M68K))
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277 if(a >= SRam.start && a <= SRam.end) {
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278 unsigned int sreg = Pico.m.sram_reg;
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279 if(!(sreg & 0x10) && (sreg & 1) && a > 0x200001) { // not yet detected SRAM
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280 Pico.m.sram_reg|=0x10; // should be normal SRAM
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282 if(sreg & 4) { // EEPROM read
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283 d = SRAMReadEEPROM();
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285 } else if(sreg & 1) {
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286 d = *(u8 *)(SRam.data-SRam.start+a);
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292 if (a<Pico.romsize) { d = *(u8 *)(Pico.rom+(a^1)); goto end; } // Rom
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293 if ((a&0xff4000)==0xa00000) { d=z80Read8(a); goto end; } // Z80 Ram
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295 d=OtherRead16(a&~1, 8); if ((a&1)==0) d>>=8;
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299 //if ((a&0xe0ffff)==0xe0AE57+0x69c)
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300 // dprintf("r8 : %06x, %02x @%06x", a&0xffffff, (u8)d, SekPc);
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301 //if ((a&0xe0ffff)==0xe0a9ba+0x69c)
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302 // dprintf("r8 : %06x, %02x @%06x", a&0xffffff, d, SekPc);
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304 //if(a==0x200001) dprintf("r8 : %02x @ %06x [%i]", d, SekPc, SekCyclesDoneT());
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305 //dprintf("r8 : %06x, %02x @%06x [%03i]", a&0xffffff, (u8)d, SekPc, Pico.m.scanline);
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307 dprintf("r8 : %06x, %02x @%06x", a&0xffffff, (u8)d, SekPc);
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309 #if defined(EMU_C68K) && defined(EMU_M68K)
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310 if(a>=Pico.romsize&&(ppop&0x3f)!=0x3a&&(ppop&0x3f)!=0x3b) {
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312 lastread_d[lrp_cyc++&15] = (u8)d;
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318 u16 CPU_CALL PicoRead16(u32 a)
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322 if ((a&0xe00000)==0xe00000) { d=*(u16 *)(Pico.ram+(a&0xfffe)); goto end; } // Ram
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326 #if !(defined(EMU_C68K) && defined(EMU_M68K))
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328 if(a >= SRam.start && a <= SRam.end && (Pico.m.sram_reg & 1)) {
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329 d = (u16) SRAMRead(a);
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334 if (a<Pico.romsize) { d = *(u16 *)(Pico.rom+a); goto end; } // Rom
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336 d = (u16)OtherRead16(a, 16);
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339 //if ((a&0xe0ffff)==0xe0AF0E+0x69c||(a&0xe0ffff)==0xe0A9A8+0x69c||(a&0xe0ffff)==0xe0A9AA+0x69c||(a&0xe0ffff)==0xe0A9AC+0x69c)
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340 // dprintf("r16: %06x, %04x @%06x", a&0xffffff, d, SekPc);
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343 dprintf("r16: %06x, %04x @%06x", a&0xffffff, d, SekPc);
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345 #if defined(EMU_C68K) && defined(EMU_M68K)
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346 if(a>=Pico.romsize&&(ppop&0x3f)!=0x3a&&(ppop&0x3f)!=0x3b) {
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348 lastread_d[lrp_cyc++&15] = d;
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354 u32 CPU_CALL PicoRead32(u32 a)
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358 if ((a&0xe00000)==0xe00000) { u16 *pm=(u16 *)(Pico.ram+(a&0xfffe)); d = (pm[0]<<16)|pm[1]; goto end; } // Ram
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363 if(a >= SRam.start && a <= SRam.end && (Pico.m.sram_reg & 1)) {
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364 d = (SRAMRead(a)<<16)|SRAMRead(a+2);
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368 if (a<Pico.romsize) { u16 *pm=(u16 *)(Pico.rom+a); d = (pm[0]<<16)|pm[1]; goto end; } // Rom
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370 d = (OtherRead16(a, 32)<<16)|OtherRead16(a+2, 32);
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374 dprintf("r32: %06x, %08x @%06x", a&0xffffff, d, SekPc);
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376 #if defined(EMU_C68K) && defined(EMU_M68K)
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377 if(a>=Pico.romsize&&(ppop&0x3f)!=0x3a&&(ppop&0x3f)!=0x3b) {
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379 lastread_d[lrp_cyc++&15] = d;
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386 // -----------------------------------------------------------------
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389 static void CPU_CALL PicoWrite8(u32 a,u8 d)
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392 dprintf("w8 : %06x, %02x @%06x", a&0xffffff, d, SekPc);
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394 #if defined(EMU_C68K) && defined(EMU_M68K)
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395 lastwrite_cyc_d[lwp_cyc++&15] = d;
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397 //if ((a&0xe0ffff)==0xe0a9ba+0x69c)
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398 // dprintf("w8 : %06x, %02x @%06x", a&0xffffff, d, SekPc);
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400 if ((a&0xe00000)==0xe00000) { *(u8 *)(Pico.ram+((a^1)&0xffff))=d; return; } // Ram
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403 OtherWrite8(a,d,8);
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406 void CPU_CALL PicoWrite16(u32 a,u16 d)
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409 dprintf("w16: %06x, %04x", a&0xffffff, d);
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411 #if defined(EMU_C68K) && defined(EMU_M68K)
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412 lastwrite_cyc_d[lwp_cyc++&15] = d;
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414 //if ((a&0xe0ffff)==0xe0AF0E+0x69c||(a&0xe0ffff)==0xe0A9A8+0x69c||(a&0xe0ffff)==0xe0A9AA+0x69c||(a&0xe0ffff)==0xe0A9AC+0x69c)
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415 // dprintf("w16: %06x, %04x @%06x", a&0xffffff, d, SekPc);
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417 if ((a&0xe00000)==0xe00000) { *(u16 *)(Pico.ram+(a&0xfffe))=d; return; } // Ram
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423 static void CPU_CALL PicoWrite32(u32 a,u32 d)
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426 dprintf("w32: %06x, %08x", a&0xffffff, d);
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428 #if defined(EMU_C68K) && defined(EMU_M68K)
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429 lastwrite_cyc_d[lwp_cyc++&15] = d;
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432 if ((a&0xe00000)==0xe00000)
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435 u16 *pm=(u16 *)(Pico.ram+(a&0xfffe));
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436 pm[0]=(u16)(d>>16); pm[1]=(u16)d;
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441 OtherWrite16(a, (u16)(d>>16));
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442 OtherWrite16(a+2,(u16)d);
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446 // -----------------------------------------------------------------
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447 void PicoMemSetup()
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450 // Setup memory callbacks:
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451 PicoCpu.checkpc=PicoCheckPc;
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452 PicoCpu.fetch8 =PicoCpu.read8 =PicoRead8;
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453 PicoCpu.fetch16=PicoCpu.read16=PicoRead16;
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454 PicoCpu.fetch32=PicoCpu.read32=PicoRead32;
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455 PicoCpu.write8 =PicoWrite8;
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456 PicoCpu.write16=PicoWrite16;
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457 PicoCpu.write32=PicoWrite32;
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465 u8 (__fastcall *Read8) (u32 a);
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466 u16 (__fastcall *Read16)(u32 a);
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467 u32 (__fastcall *Read32)(u32 a);
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468 void (__fastcall *Write8) (u32 a,u8 d);
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469 void (__fastcall *Write16) (u32 a,u16 d);
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470 void (__fastcall *Write32) (u32 a,u32 d);
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471 void (__fastcall *ChangePc)(u32 a);
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472 u8 (__fastcall *PcRel8) (u32 a);
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473 u16 (__fastcall *PcRel16)(u32 a);
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474 u32 (__fastcall *PcRel32)(u32 a);
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475 u16 (__fastcall *Dir16)(u32 a);
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476 u32 (__fastcall *Dir32)(u32 a);
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479 struct A68KInter a68k_memory_intf=
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492 PicoRead16, // unused
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493 PicoRead32, // unused
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498 unsigned int m68k_read_pcrelative_CD8 (unsigned int a);
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499 unsigned int m68k_read_pcrelative_CD16(unsigned int a);
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500 unsigned int m68k_read_pcrelative_CD32(unsigned int a);
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502 // these are allowed to access RAM
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503 unsigned int m68k_read_pcrelative_8 (unsigned int a) {
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505 if(PicoMCD&1) return m68k_read_pcrelative_CD8(a);
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506 if(a<Pico.romsize) return *(u8 *)(Pico.rom+(a^1)); // Rom
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507 if((a&0xe00000)==0xe00000) return *(u8 *)(Pico.ram+((a^1)&0xffff)); // Ram
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508 return 0;//(u8) lastread_d;
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510 unsigned int m68k_read_pcrelative_16(unsigned int a) {
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512 if(PicoMCD&1) return m68k_read_pcrelative_CD16(a);
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513 if(a<Pico.romsize) return *(u16 *)(Pico.rom+(a&~1)); // Rom
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514 if((a&0xe00000)==0xe00000) return *(u16 *)(Pico.ram+(a&0xfffe)); // Ram
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515 return 0;//(u16) lastread_d;
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517 unsigned int m68k_read_pcrelative_32(unsigned int a) {
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519 if(PicoMCD&1) return m68k_read_pcrelative_CD32(a);
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520 if(a<Pico.romsize) { u16 *pm=(u16 *)(Pico.rom+(a&~1)); return (pm[0]<<16)|pm[1]; }
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521 if((a&0xe00000)==0xe00000) { u16 *pm=(u16 *)(Pico.ram+(a&0xfffe)); return (pm[0]<<16)|pm[1]; } // Ram
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522 return 0;//lastread_d;
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525 unsigned int m68k_read_immediate_16(unsigned int a) { return m68k_read_pcrelative_16(a); }
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526 unsigned int m68k_read_immediate_32(unsigned int a) { return m68k_read_pcrelative_32(a); }
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527 unsigned int m68k_read_disassembler_8 (unsigned int a) { return m68k_read_pcrelative_8 (a); }
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528 unsigned int m68k_read_disassembler_16(unsigned int a) { return m68k_read_pcrelative_16(a); }
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529 unsigned int m68k_read_disassembler_32(unsigned int a) { return m68k_read_pcrelative_32(a); }
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533 unsigned int m68k_read_memory_8(unsigned int a) { if(a<Pico.romsize) return *(u8 *) (Pico.rom+(a^1)); return (u8) lastread_d[lrp_mus++&15]; }
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534 unsigned int m68k_read_memory_16(unsigned int a) { if(a<Pico.romsize) return *(u16 *)(Pico.rom+(a&~1));return (u16) lastread_d[lrp_mus++&15]; }
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535 unsigned int m68k_read_memory_32(unsigned int a) { if(a<Pico.romsize) {u16 *pm=(u16 *)(Pico.rom+(a&~1));return (pm[0]<<16)|pm[1];} return lastread_d[lrp_mus++&15]; }
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537 // ignore writes, Cyclone already done that
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538 void m68k_write_memory_8(unsigned int address, unsigned int value) { lastwrite_mus_d[lwp_mus++&15] = value; }
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539 void m68k_write_memory_16(unsigned int address, unsigned int value) { lastwrite_mus_d[lwp_mus++&15] = value; }
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540 void m68k_write_memory_32(unsigned int address, unsigned int value) { lastwrite_mus_d[lwp_mus++&15] = value; }
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542 unsigned char PicoReadCD8w (unsigned int a);
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543 unsigned short PicoReadCD16w(unsigned int a);
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544 unsigned int PicoReadCD32w(unsigned int a);
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545 void PicoWriteCD8w (unsigned int a, unsigned char d);
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546 void PicoWriteCD16w(unsigned int a, unsigned short d);
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547 void PicoWriteCD32w(unsigned int a, unsigned int d);
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549 unsigned int m68k_read_memory_8(unsigned int address)
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551 return (PicoMCD&1) ? PicoReadCD8w(address) : PicoRead8(address);
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554 unsigned int m68k_read_memory_16(unsigned int address)
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556 return (PicoMCD&1) ? PicoReadCD16w(address) : PicoRead16(address);
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559 unsigned int m68k_read_memory_32(unsigned int address)
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561 return (PicoMCD&1) ? PicoReadCD32w(address) : PicoRead32(address);
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564 void m68k_write_memory_8(unsigned int address, unsigned int value)
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566 if (PicoMCD&1) PicoWriteCD8w(address, (u8)value); else PicoWrite8(address, (u8)value);
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569 void m68k_write_memory_16(unsigned int address, unsigned int value)
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571 if (PicoMCD&1) PicoWriteCD16w(address,(u16)value); else PicoWrite16(address,(u16)value);
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574 void m68k_write_memory_32(unsigned int address, unsigned int value)
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576 if (PicoMCD&1) PicoWriteCD32w(address, value); else PicoWrite32(address, value);
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582 // -----------------------------------------------------------------
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585 unsigned char z80_read(unsigned short a)
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589 if ((a>>13)==2) // 0x4000-0x5fff (Charles MacDonald)
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591 if(PicoOpt&1) ret = (u8) YM2612Read();
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598 addr68k=Pico.m.z80_bank68k<<15;
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601 ret = (u8) PicoRead8(addr68k);
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602 //dprintf("z80->68k w8 : %06x, %02x", addr68k, ret);
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606 // should not be needed || dprintf("z80_read RAM");
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607 if (a<0x4000) { ret = (u8) Pico.zram[a&0x1fff]; goto end; }
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613 unsigned short z80_read16(unsigned short a)
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615 //dprintf("z80_read16");
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617 return (u16) ( (u16)z80_read(a) | ((u16)z80_read((u16)(a+1))<<8) );
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620 void z80_write(unsigned char data, unsigned short a)
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623 // dprintf("z80 w8 : %06x, %02x @%04x", a, data, mz80GetRegisterValue(NULL, 0));
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625 if ((a>>13)==2) // 0x4000-0x5fff (Charles MacDonald)
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627 if(PicoOpt&1) emustatus|=YM2612Write(a, data);
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631 if ((a&0xfff9)==0x7f11) // 7f11 7f13 7f15 7f17
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633 if(PicoOpt&2) SN76496Write(data);
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639 Pico.m.z80_bank68k>>=1;
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640 Pico.m.z80_bank68k|=(data&1)<<8;
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641 Pico.m.z80_bank68k&=0x1ff; // 9 bits and filled in the new top one
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648 addr68k=Pico.m.z80_bank68k<<15;
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650 PicoWrite8(addr68k, data);
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651 //dprintf("z80->68k w8 : %06x, %02x", addr68k, data);
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655 // should not be needed, drZ80 knows how to access RAM itself || dprintf("z80_write RAM @ %08x", lr);
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656 if (a<0x4000) { Pico.zram[a&0x1fff]=data; return; }
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659 void z80_write16(unsigned short data, unsigned short a)
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661 //dprintf("z80_write16");
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663 z80_write((unsigned char) data,a);
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664 z80_write((unsigned char)(data>>8),(u16)(a+1));
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