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[Core/MD] fixed SRAM bankswitching for games also using ROM bankswitching (fixes Astebros)

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ekeeke 2023-06-13 01:00:56 +02:00
parent 95bde804a6
commit 4bb149ba0b
4 changed files with 7 additions and 12 deletions
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builds/genesis_plus_gx_libretro.dll
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19
core/cart_hw/md_cart.c
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@ -999,7 +999,6 @@ static void mapper_sega_w(uint32 data)
if (sram.on)
{
/* Backup RAM mapped to $200000-$20ffff (normally mirrored up to $3fffff but this breaks Sonic Megamix and no game need it) */
m68k.memory_map[0x20].base = sram.sram;
m68k.memory_map[0x20].read8 = sram_read_byte;
m68k.memory_map[0x20].read16 = sram_read_word;
zbank_memory_map[0x20].read = sram_read_byte;
@ -1031,17 +1030,13 @@ static void mapper_sega_w(uint32 data)
}
else
{
/* cartridge ROM mapped to $200000-$3fffff */
for (i=0x20; i<0x40; i++)
{
m68k.memory_map[i].base = cart.rom + ((i<<16) & cart.mask);
m68k.memory_map[i].read8 = NULL;
m68k.memory_map[i].read16 = NULL;
zbank_memory_map[i].read = NULL;
m68k.memory_map[i].write8 = m68k_unused_8_w;
m68k.memory_map[i].write16 = m68k_unused_16_w;
zbank_memory_map[i].write = zbank_unused_w;
}
/* cartridge ROM mapped to $200000-$20ffff */
m68k.memory_map[0x20].read8 = NULL;
m68k.memory_map[0x20].read16 = NULL;
zbank_memory_map[0x20].read = NULL;
m68k.memory_map[0x20].write8 = m68k_unused_8_w;
m68k.memory_map[0x20].write16 = m68k_unused_16_w;
zbank_memory_map[0x20].write = zbank_unused_w;
}
}