mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-09-10 16:53:15 +02:00
This commit is contained in:
commit
e5a1184a51
@ -4,7 +4,7 @@
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*
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* Copyright (C) 2007-2013 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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* Many cartridge protections were initially documented by Haze
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* (http://haze.mameworld.info/)
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*
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* Realtec mapper was documented by TascoDeluxe
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@ -42,6 +42,7 @@
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****************************************************************************************/
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#include "shared.h"
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#include "eeprom_i2c.h"
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#include "eeprom_spi.h"
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#include "gamepad.h"
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@ -356,7 +357,25 @@ void md_cart_init(void)
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BACKUP MEMORY
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***********************************************/
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sram_init();
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eeprom_i2c_init();
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/* external SRAM */
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if (sram.on && !sram.custom)
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{
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/* disabled on startup if ROM is mapped in same area */
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if (cart.romsize <= sram.start)
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{
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/* initialize m68k bus handlers */
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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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}
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/**********************************************
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SVP CHIP
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***********************************************/
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@ -492,7 +511,7 @@ void md_cart_init(void)
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}
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/**********************************************
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Cartridge Extra Hardware
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CARTRIDGE EXTRA HARDWARE
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***********************************************/
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memset(&cart.hw, 0, sizeof(cart.hw));
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@ -607,7 +626,7 @@ void md_cart_init(void)
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m68k.memory_map[i].base = cart.rom + ((i & 0x03) << 16);
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}
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/* 32K SRAM is initially disabled at $200000-$2FFFFF */
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/* 32K static RAM is mapped to $200000-$2FFFFF (disabled on startup) */
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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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@ -789,10 +808,28 @@ int md_cart_context_load(uint8 *state)
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if (offset == 0xff)
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{
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/* SRAM */
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m68k.memory_map[i].base = sram.sram;
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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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else
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{
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/* check if SRAM was mapped there before loading state */
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if (m68k.memory_map[i].base == sram.sram)
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{
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m68k.memory_map[i].read8 = NULL;
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m68k.memory_map[i].read16 = NULL;
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m68k.memory_map[i].write8 = m68k_unused_8_w;
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m68k.memory_map[i].write16 = m68k_unused_16_w;
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zbank_memory_map[i].read = NULL;
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zbank_memory_map[i].write = zbank_unused_w;
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}
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/* ROM */
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m68k.memory_map[i].base = cart.rom + (offset << 16);
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}
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@ -829,9 +866,9 @@ static void mapper_sega_w(uint32 data)
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{
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/* Backup RAM mapped to $200000-$20ffff (normally mirrored up to $3fffff but this breaks Sonic Megamix and no game need it) */
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m68k.memory_map[0x20].base = sram.sram;
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m68k.memory_map[0x20].write8 = NULL;
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m68k.memory_map[0x20].write16 = NULL;
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zbank_memory_map[0x20].write = NULL;
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m68k.memory_map[0x20].read8 = sram_read_byte;
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m68k.memory_map[0x20].read16 = sram_read_word;
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zbank_memory_map[0x20].read = sram_read_byte;
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/* Backup RAM write protection */
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if (data & 2)
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@ -840,6 +877,12 @@ static void mapper_sega_w(uint32 data)
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m68k.memory_map[0x20].write16 = m68k_unused_16_w;
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zbank_memory_map[0x20].write = zbank_unused_w;
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}
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else
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{
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m68k.memory_map[0x20].write8 = sram_write_byte;
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m68k.memory_map[0x20].write16 = sram_write_word;
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zbank_memory_map[0x20].write = sram_write_byte;
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}
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}
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/* S&K lock-on chip */
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@ -857,10 +900,13 @@ static void mapper_sega_w(uint32 data)
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/* cartridge ROM mapped to $200000-$3fffff */
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for (i=0x20; i<0x40; i++)
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{
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m68k.memory_map[i].base = cart.rom + ((i<<16) & cart.mask);
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m68k.memory_map[i].write8 = m68k_unused_8_w;
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m68k.memory_map[i].write16 = m68k_unused_16_w;
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zbank_memory_map[i].write = zbank_unused_w;
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m68k.memory_map[i].base = cart.rom + ((i<<16) & cart.mask);
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m68k.memory_map[i].read8 = NULL;
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m68k.memory_map[i].read16 = NULL;
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zbank_memory_map[i].read = NULL;
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m68k.memory_map[i].write8 = m68k_unused_8_w;
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m68k.memory_map[i].write16 = m68k_unused_16_w;
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zbank_memory_map[i].write = zbank_unused_w;
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}
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}
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}
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@ -907,10 +953,10 @@ static void mapper_sf001_w(uint32 address, uint32 data)
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m68k.memory_map[i].base = cart.rom + (i << 16);
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m68k.memory_map[i].read8 = m68k_read_bus_8;
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m68k.memory_map[i].read16 = m68k_read_bus_16;
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m68k.memory_map[i].write8 = m68k_unused_8_w;
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m68k.memory_map[i].write16 = m68k_unused_16_w;
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m68k.memory_map[i].write8 = (i > 0x00) ? m68k_unused_8_w : mapper_sf001_w;
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m68k.memory_map[i].write16 = (i > 0x00) ? m68k_unused_16_w : mapper_sf001_w;
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zbank_memory_map[i].read = zbank_unused_r;
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zbank_memory_map[i].write = m68k_unused_8_w;
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zbank_memory_map[i].write = (i > 0x00) ? m68k_unused_8_w : mapper_sf001_w;
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}
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}
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@ -939,12 +985,12 @@ static void mapper_sf001_w(uint32 address, uint32 data)
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while (i<0x40)
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{
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m68k.memory_map[i].base = sram.sram;
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m68k.memory_map[i].read8 = NULL;
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m68k.memory_map[i].read16 = NULL;
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m68k.memory_map[i].write8 = NULL;
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m68k.memory_map[i].write16 = NULL;
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zbank_memory_map[i].read = NULL;
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zbank_memory_map[i].write = NULL;
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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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i++;
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}
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}
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@ -956,10 +1002,10 @@ static void mapper_sf001_w(uint32 address, uint32 data)
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m68k.memory_map[i].base = cart.rom + (i << 16);
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m68k.memory_map[i].read8 = NULL;
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m68k.memory_map[i].read16 = NULL;
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m68k.memory_map[i].write8 = m68k_unused_8_w;
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m68k.memory_map[i].write16 = m68k_unused_16_w;
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m68k.memory_map[i].write8 = (i > 0x00) ? m68k_unused_8_w : mapper_sf001_w;
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m68k.memory_map[i].write16 = (i > 0x00) ? m68k_unused_16_w : mapper_sf001_w;
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zbank_memory_map[i].read = NULL;
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zbank_memory_map[i].write = m68k_unused_8_w;
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zbank_memory_map[i].write = (i > 0x00) ? m68k_unused_8_w : mapper_sf001_w;
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}
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}
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@ -1023,12 +1069,12 @@ static void mapper_sf004_w(uint32 address, uint32 data)
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/* 32KB static RAM mirrored into $200000-$2FFFFF (odd bytes only) */
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for (i=0x20; i<0x30; i++)
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{
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m68k.memory_map[i].read8 = NULL;
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m68k.memory_map[i].read16 = NULL;
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m68k.memory_map[i].write8 = NULL;
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m68k.memory_map[i].write16 = NULL;
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zbank_memory_map[i].read = NULL;
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zbank_memory_map[i].write = NULL;
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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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else
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****************************************************************************************/
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#include "shared.h"
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#include "eeprom_i2c.h"
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T_SRAM sram;
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static unsigned int sram_read_byte(unsigned int address);
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static unsigned int sram_read_word(unsigned int address);
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static void sram_write_byte(unsigned int address, unsigned int data);
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static void sram_write_word(unsigned int address, unsigned int data);
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/****************************************************************************
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* A quick guide to external RAM on the Genesis
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*
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@ -194,44 +188,25 @@ void sram_init()
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sram.on = 1;
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}
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}
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/* autodetect games with serial EEPROM */
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eeprom_i2c_init();
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/* initialize m68k bus handlers (if not already done) */
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if (sram.on && !sram.custom)
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{
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/* disabled on startup if ROM is mapped in same area */
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if (cart.romsize <= sram.start)
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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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}
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}
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static unsigned int sram_read_byte(unsigned int address)
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unsigned int sram_read_byte(unsigned int address)
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{
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return sram.sram[address & 0xffff];
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}
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static unsigned int sram_read_word(unsigned int address)
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unsigned int sram_read_word(unsigned int address)
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{
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address &= 0xfffe;
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return (sram.sram[address + 1] | (sram.sram[address] << 8));
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}
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static void sram_write_byte(unsigned int address, unsigned int data)
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void sram_write_byte(unsigned int address, unsigned int data)
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{
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sram.sram[address & 0xffff] = data;
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}
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static void sram_write_word(unsigned int address, unsigned int data)
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void sram_write_word(unsigned int address, unsigned int data)
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{
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address &= 0xfffe;
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sram.sram[address] = data >> 8;
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@ -52,6 +52,10 @@ typedef struct
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/* Function prototypes */
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extern void sram_init();
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extern unsigned int sram_read_byte(unsigned int address);
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extern unsigned int sram_read_word(unsigned int address);
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extern void sram_write_byte(unsigned int address, unsigned int data);
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extern void sram_write_word(unsigned int address, unsigned int data);
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/* global variables */
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extern T_SRAM sram;
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@ -129,14 +129,25 @@ void lightgun_refresh(int port)
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}
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}
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/* External Interrupt ? */
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/* External Interrupt enabled ? */
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if (reg[11] & 0x08)
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{
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m68k_update_irq(2);
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}
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/* HACK: force HV Counter latch (some games does not lock HV Counter but instead use larger offset value) */
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hvc_latch = 0x10000 | (y << 8);
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/* HVC latch enabled ? */
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if (reg[0] & 0x02)
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{
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/* line accurate V-Counter value */
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hvc_latch = 0x10000 | (y << 8);
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}
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else
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{
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/* HACK: force HVC latch even when disabled (a few games does not lock HV Counter but instead applies larger offset value) */
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hvc_latch = 0x20000 | (y << 8);
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}
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/* pixel accurate H-Counter value */
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if (reg[12] & 1)
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{
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hvc_latch |= hc_320[((x / 2) + input.x_offset) % 210];
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@ -147,6 +158,11 @@ void lightgun_refresh(int port)
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}
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}
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}
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else if (hvc_latch & 0x20000)
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{
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/* HVC should be free-running on other lines when latch is disabled (fixes "Gunfight - 3 in 1" randomization) */
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hvc_latch = 0;
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}
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}
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}
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@ -1362,42 +1362,34 @@ unsigned int vdp_hvc_r(unsigned int cycles)
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int vc;
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unsigned int data = hvc_latch;
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/* Check if HVC is frozen */
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if (!data)
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/* Check if HVC latch is enabled */
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if (data)
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{
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/* Cycle-accurate HCounter (Striker, Mickey Mania, Skitchin, Road Rash I,II,III, Sonic 3D Blast...) */
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data = hctab[cycles % MCYCLES_PER_LINE];
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}
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else
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{
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/* Mode 5: HV counters are frozen (cf. lightgun games & Sunset Riders) */
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if (reg[1] & 4)
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/* Mode 5: HV-counters are frozen (cf. lightgun games, Sunset Riders logo) */
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if (reg[1] & 0x04)
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{
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/* check if HVC is really locked or is read within INT2 callback (HVC latch is forced for lightgun emulation, cf. lightgun.c) */
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if ((reg[0] & 0x02) || (m68k.int_mask == 0x0200))
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{
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#ifdef LOGVDP
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error("[%d(%d)][%d(%d)] HVC read -> 0x%x (%x)\n", v_counter, (cycles/MCYCLES_PER_LINE-1)%lines_per_frame, cycles, cycles%MCYCLES_PER_LINE, data & 0xffff, m68k_get_reg(M68K_REG_PC));
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error("[%d(%d)][%d(%d)] HVC latch read -> 0x%x (%x)\n", v_counter, (cycles/MCYCLES_PER_LINE-1)%lines_per_frame, cycles, cycles%MCYCLES_PER_LINE, data & 0xffff, m68k_get_reg(M68K_REG_PC));
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#endif
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/* return latched HVC value */
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return (data & 0xffff);
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}
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/* HV counters should be free-running (fixes "Gunfight - 3 in 1" randomization when Justifiers are enabled) */
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hvc_latch = 0;
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data = hctab[cycles % MCYCLES_PER_LINE];
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/* return latched HVC value */
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return (data & 0xffff);
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}
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else
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{
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/* Mode 4: V counter runs normally, H counter is frozen */
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/* Mode 4: by default, V-counter runs normally & H counter is frozen */
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data &= 0xff;
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}
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}
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else
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{
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/* Cycle-accurate H-Counter (Striker, Mickey Mania, Skitchin, Road Rash I,II,III, Sonic 3D Blast...) */
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data = hctab[cycles % MCYCLES_PER_LINE];
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}
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/* Cycle-accurate VCounter (cycle counter starts from line -1) */
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/* Cycle-accurate V-Counter (cycle counter starts from line -1) */
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vc = (cycles / MCYCLES_PER_LINE) - 1;
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/* VCounter overflow */
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/* V-Counter overflow */
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if (vc > vc_max)
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{
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vc -= lines_per_frame;
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@ -1413,6 +1405,7 @@ unsigned int vdp_hvc_r(unsigned int cycles)
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vc = (vc & ~1) | ((vc >> 8) & 1);
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}
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/* return H-Counter in LSB & V-Counter in MSB */
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data |= ((vc & 0xff) << 8);
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#ifdef LOGVDP
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