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[MD] added auto-detection of byte-swapped ROM

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EkeEke 2013-04-19 16:54:26 +02:00
parent 540985a068
commit 49392b331e
1 changed files with 15 additions and 15 deletions
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30
source/loadrom.c
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@ -601,7 +601,7 @@ int load_rom(char *filename)
/* Mega Drive hardware (Genesis mode) */ /* Mega Drive hardware (Genesis mode) */
system_hw = SYSTEM_MD; system_hw = SYSTEM_MD;
/* Decode .MDX format */ /* decode .MDX format */
if (!memcmp("MDX", &extension[0], 3)) if (!memcmp("MDX", &extension[0], 3))
{ {
for (i = 4; i < size - 1; i++) for (i = 4; i < size - 1; i++)
@ -610,6 +610,18 @@ int load_rom(char *filename)
} }
size = size - 5; size = size - 5;
} }
/* auto-detect byte-swapped dumps */
if (!memcmp((char *)(cart.rom + 0x100),"ESAGM GE ARDVI E", 16) ||
!memcmp((char *)(cart.rom + 0x100),"ESAGG NESESI", 12))
{
for(i = 0; i < size; i += 2)
{
uint8 temp = cart.rom[i];
cart.rom[i] = cart.rom[i+1];
cart.rom[i+1] = temp;
}
}
} }
/* auto-detect 512 byte extra header */ /* auto-detect 512 byte extra header */
@ -656,10 +668,10 @@ int load_rom(char *filename)
scd.cartridge.boot = 0x00; scd.cartridge.boot = 0x00;
} }
#ifdef LSB_FIRST
/* 16-bit ROM specific */ /* 16-bit ROM specific */
else if (system_hw == SYSTEM_MD) else if (system_hw == SYSTEM_MD)
{ {
#ifdef LSB_FIRST
/* Byteswap ROM to optimize 16-bit access */ /* Byteswap ROM to optimize 16-bit access */
for (i = 0; i < cart.romsize; i += 2) for (i = 0; i < cart.romsize; i += 2)
{ {
@ -667,20 +679,8 @@ int load_rom(char *filename)
cart.rom[i] = cart.rom[i+1]; cart.rom[i] = cart.rom[i+1];
cart.rom[i+1] = temp; cart.rom[i+1] = temp;
} }
#endif
/* byteswapped RADICA dumps (from Haze) */
if (((strstr(rominfo.product,"-K0101") != NULL) && (rominfo.checksum == 0xf424)) ||
((strstr(rominfo.product,"-K0109") != NULL) && (rominfo.checksum == 0x4f10)))
{
for(i = 0; i < cart.romsize; i += 2)
{
uint8 temp = cart.rom[i];
cart.rom[i] = cart.rom[i+1];
cart.rom[i+1] = temp;
}
}
} }
#endif
/* Save auto-detected system hardware */ /* Save auto-detected system hardware */
romtype = system_hw; romtype = system_hw;