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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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@ -2,7 +2,7 @@
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* Genesis Plus
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* Mega Drive cartridge hardware support
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*
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* Copyright (C) 2007-2017 Eke-Eke (Genesis Plus GX)
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* Copyright (C) 2007-2019 Eke-Eke (Genesis Plus GX)
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*
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* Many cartridge protections were initially documented by Haze
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* (http://haze.mameworld.info/)
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@ -376,17 +376,37 @@ void md_cart_init(void)
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sram_init();
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eeprom_i2c_init();
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/* external SRAM */
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/* memory-mapped SRAM */
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if (sram.on && !sram.custom)
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{
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/* initialize default memory mapping for SRAM */
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m68k.memory_map[sram.start >> 16].base = sram.sram;
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m68k.memory_map[sram.start >> 16].read8 = sram_read_byte;
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m68k.memory_map[sram.start >> 16].read16 = sram_read_word;
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m68k.memory_map[sram.start >> 16].write8 = sram_write_byte;
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m68k.memory_map[sram.start >> 16].write16 = sram_write_word;
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zbank_memory_map[sram.start >> 16].read = sram_read_byte;
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zbank_memory_map[sram.start >> 16].write = sram_write_byte;
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/* 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,...) */
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if (sram.start >= size)
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{
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m68k.memory_map[sram.start >> 16].base = sram.sram;
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m68k.memory_map[sram.start >> 16].read8 = sram_read_byte;
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m68k.memory_map[sram.start >> 16].read16 = sram_read_word;
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m68k.memory_map[sram.start >> 16].write8 = sram_write_byte;
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m68k.memory_map[sram.start >> 16].write16 = sram_write_word;
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zbank_memory_map[sram.start >> 16].read = sram_read_byte;
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zbank_memory_map[sram.start >> 16].write = sram_write_byte;
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}
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/* support for Triple Play 96 & Triple Play - Gold Edition (available ROM dumps include dumped SRAM data) */
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else if ((strstr(rominfo.product,"T-172026") != NULL) || (strstr(rominfo.product,"T-172116") != NULL))
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{
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/* $000000-$1fffff and $300000-$3fffff: cartridge ROM (2MB + 1MB) */
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/* $200000-$2fffff: SRAM (32 KB mirrored) */
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for (i=0x20; i<0x30; i++)
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{
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m68k.memory_map[i].base = sram.sram;
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m68k.memory_map[i].read8 = sram_read_byte;
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m68k.memory_map[i].read16 = sram_read_word;
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m68k.memory_map[i].write8 = sram_write_byte;
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m68k.memory_map[i].write16 = sram_write_word;
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zbank_memory_map[i].read = sram_read_byte;
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zbank_memory_map[i].write = sram_write_byte;
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}
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}
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}
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/**********************************************
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@ -2,7 +2,7 @@
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* Genesis Plus
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* Mega Drive cartridge hardware support
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*
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* Copyright (C) 2007-2017 Eke-Eke (Genesis Plus GX)
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* Copyright (C) 2007-2019 Eke-Eke (Genesis Plus GX)
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*
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* Most cartridge protections were initially documented by Haze
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* (http://haze.mameworld.info/)
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