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[Core/MD] fixed SRAM power-on state with games larger than 2MB (Duke Nukem 3D, Triple Play 96, Triple Play - Gold Edition)

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ekeeke 2019-01-26 18:33:41 +01:00
parent b0de643e86
commit 32079418a9
5 changed files with 31 additions and 11 deletions
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builds/genesis_plus_gx_libretro.dll
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builds/genplus_cube.dol
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40
core/cart_hw/md_cart.c
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@ -2,7 +2,7 @@
* Genesis Plus
* Mega Drive cartridge hardware support
*
* Copyright (C) 2007-2017 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2007-2019 Eke-Eke (Genesis Plus GX)
*
* Many cartridge protections were initially documented by Haze
* (http://haze.mameworld.info/)
@ -376,17 +376,37 @@ void md_cart_init(void)
sram_init();
eeprom_i2c_init();
/* external SRAM */
/* memory-mapped SRAM */
if (sram.on && !sram.custom)
{
/* initialize default memory mapping for SRAM */
m68k.memory_map[sram.start >> 16].base = sram.sram;
m68k.memory_map[sram.start >> 16].read8 = sram_read_byte;
m68k.memory_map[sram.start >> 16].read16 = sram_read_word;
m68k.memory_map[sram.start >> 16].write8 = sram_write_byte;
m68k.memory_map[sram.start >> 16].write16 = sram_write_word;
zbank_memory_map[sram.start >> 16].read = sram_read_byte;
zbank_memory_map[sram.start >> 16].write = sram_write_byte;
/* SRAM is mapped by default unless it overlaps with ROM area (Phantasy Star 4, Beyond Oasis/Legend of Thor, World Series Baseball 9x, Duke Nukem 3D,...) */
if (sram.start >= size)
{
m68k.memory_map[sram.start >> 16].base = sram.sram;
m68k.memory_map[sram.start >> 16].read8 = sram_read_byte;
m68k.memory_map[sram.start >> 16].read16 = sram_read_word;
m68k.memory_map[sram.start >> 16].write8 = sram_write_byte;
m68k.memory_map[sram.start >> 16].write16 = sram_write_word;
zbank_memory_map[sram.start >> 16].read = sram_read_byte;
zbank_memory_map[sram.start >> 16].write = sram_write_byte;
}
/* support for Triple Play 96 & Triple Play - Gold Edition (available ROM dumps include dumped SRAM data) */
else if ((strstr(rominfo.product,"T-172026") != NULL) || (strstr(rominfo.product,"T-172116") != NULL))
{
/* $000000-$1fffff and $300000-$3fffff: cartridge ROM (2MB + 1MB) */
/* $200000-$2fffff: SRAM (32 KB mirrored) */
for (i=0x20; i<0x30; i++)
{
m68k.memory_map[i].base = sram.sram;
m68k.memory_map[i].read8 = sram_read_byte;
m68k.memory_map[i].read16 = sram_read_word;
m68k.memory_map[i].write8 = sram_write_byte;
m68k.memory_map[i].write16 = sram_write_word;
zbank_memory_map[i].read = sram_read_byte;
zbank_memory_map[i].write = sram_write_byte;
}
}
}
/**********************************************

2
core/cart_hw/md_cart.h
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@ -2,7 +2,7 @@
* Genesis Plus
* Mega Drive cartridge hardware support
*
* Copyright (C) 2007-2017 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2007-2019 Eke-Eke (Genesis Plus GX)
*
* Most cartridge protections were initially documented by Haze
* (http://haze.mameworld.info/)