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https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-09-10 16:53:15 +02:00
[MD] added auto-detection of byte-swapped ROM
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540985a068
commit
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@ -601,7 +601,7 @@ int load_rom(char *filename)
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/* Mega Drive hardware (Genesis mode) */
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/* Mega Drive hardware (Genesis mode) */
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system_hw = SYSTEM_MD;
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system_hw = SYSTEM_MD;
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/* Decode .MDX format */
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/* decode .MDX format */
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if (!memcmp("MDX", &extension[0], 3))
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if (!memcmp("MDX", &extension[0], 3))
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{
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{
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for (i = 4; i < size - 1; i++)
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for (i = 4; i < size - 1; i++)
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@ -610,6 +610,18 @@ int load_rom(char *filename)
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}
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}
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size = size - 5;
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size = size - 5;
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}
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}
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/* auto-detect byte-swapped dumps */
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if (!memcmp((char *)(cart.rom + 0x100),"ESAGM GE ARDVI E", 16) ||
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!memcmp((char *)(cart.rom + 0x100),"ESAGG NESESI", 12))
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{
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for(i = 0; i < size; i += 2)
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{
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uint8 temp = cart.rom[i];
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cart.rom[i] = cart.rom[i+1];
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cart.rom[i+1] = temp;
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}
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}
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}
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}
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/* auto-detect 512 byte extra header */
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/* auto-detect 512 byte extra header */
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@ -656,10 +668,10 @@ int load_rom(char *filename)
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scd.cartridge.boot = 0x00;
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scd.cartridge.boot = 0x00;
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}
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}
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#ifdef LSB_FIRST
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/* 16-bit ROM specific */
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/* 16-bit ROM specific */
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else if (system_hw == SYSTEM_MD)
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else if (system_hw == SYSTEM_MD)
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{
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{
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#ifdef LSB_FIRST
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/* Byteswap ROM to optimize 16-bit access */
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/* Byteswap ROM to optimize 16-bit access */
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for (i = 0; i < cart.romsize; i += 2)
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for (i = 0; i < cart.romsize; i += 2)
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{
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{
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@ -667,20 +679,8 @@ int load_rom(char *filename)
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cart.rom[i] = cart.rom[i+1];
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cart.rom[i] = cart.rom[i+1];
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cart.rom[i+1] = temp;
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cart.rom[i+1] = temp;
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}
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}
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#endif
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/* byteswapped RADICA dumps (from Haze) */
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if (((strstr(rominfo.product,"-K0101") != NULL) && (rominfo.checksum == 0xf424)) ||
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((strstr(rominfo.product,"-K0109") != NULL) && (rominfo.checksum == 0x4f10)))
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{
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for(i = 0; i < cart.romsize; i += 2)
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{
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uint8 temp = cart.rom[i];
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cart.rom[i] = cart.rom[i+1];
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cart.rom[i+1] = temp;
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}
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}
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}
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}
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#endif
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/* Save auto-detected system hardware */
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/* Save auto-detected system hardware */
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romtype = system_hw;
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romtype = system_hw;
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