The-Homebrew-Cloud/Genesis-Plus-GX
2
0
Fork 0
mirror of https://github.com/ekeeke/Genesis-Plus-GX.git synced 2024-09-10 16:53:15 +02:00
Code Issues Packages Projects Releases Wiki Activity

Merge https://github.com/ekeeke/Genesis-Plus-GX

Browse Source
This commit is contained in:
twinaphex 2013-06-30 16:58:34 +02:00
commit e5a1184a51
5 changed files with 119 additions and 85 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

106
core/cart_hw/md_cart.c
View File

@ -4,7 +4,7 @@
*
* Copyright (C) 2007-2013 Eke-Eke (Genesis Plus GX)
*
* Most cartridge protections were initially documented by Haze
* Many cartridge protections were initially documented by Haze
* (http://haze.mameworld.info/)
*
* Realtec mapper was documented by TascoDeluxe
@ -42,6 +42,7 @@
****************************************************************************************/
#include "shared.h"
#include "eeprom_i2c.h"
#include "eeprom_spi.h"
#include "gamepad.h"
@ -356,7 +357,25 @@ void md_cart_init(void)
BACKUP MEMORY
***********************************************/
sram_init();
eeprom_i2c_init();
/* external SRAM */
if (sram.on && !sram.custom)
{
/* disabled on startup if ROM is mapped in same area */
if (cart.romsize <= sram.start)
{
/* initialize m68k bus handlers */
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;
}
}
/**********************************************
SVP CHIP
***********************************************/
@ -492,7 +511,7 @@ void md_cart_init(void)
}
/**********************************************
Cartridge Extra Hardware
CARTRIDGE EXTRA HARDWARE
***********************************************/
memset(&cart.hw, 0, sizeof(cart.hw));
@ -607,7 +626,7 @@ void md_cart_init(void)
m68k.memory_map[i].base = cart.rom + ((i & 0x03) << 16);
}
/* 32K SRAM is initially disabled at $200000-$2FFFFF */
/* 32K static RAM is mapped to $200000-$2FFFFF (disabled on startup) */
for (i=0x20; i<0x30; i++)
{
m68k.memory_map[i].base = sram.sram;
@ -789,10 +808,28 @@ int md_cart_context_load(uint8 *state)
if (offset == 0xff)
{
/* SRAM */
m68k.memory_map[i].base = sram.sram;
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;
}
else
{
/* check if SRAM was mapped there before loading state */
if (m68k.memory_map[i].base == sram.sram)
{
m68k.memory_map[i].read8 = NULL;
m68k.memory_map[i].read16 = NULL;
m68k.memory_map[i].write8 = m68k_unused_8_w;
m68k.memory_map[i].write16 = m68k_unused_16_w;
zbank_memory_map[i].read = NULL;
zbank_memory_map[i].write = zbank_unused_w;
}
/* ROM */
m68k.memory_map[i].base = cart.rom + (offset << 16);
}
@ -829,9 +866,9 @@ static void mapper_sega_w(uint32 data)
{
/* 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].write8 = NULL;
m68k.memory_map[0x20].write16 = NULL;
zbank_memory_map[0x20].write = NULL;
m68k.memory_map[0x20].read8 = sram_read_byte;
m68k.memory_map[0x20].read16 = sram_read_word;
zbank_memory_map[0x20].read = sram_read_byte;
/* Backup RAM write protection */
if (data & 2)
@ -840,6 +877,12 @@ static void mapper_sega_w(uint32 data)
m68k.memory_map[0x20].write16 = m68k_unused_16_w;
zbank_memory_map[0x20].write = zbank_unused_w;
}
else
{
m68k.memory_map[0x20].write8 = sram_write_byte;
m68k.memory_map[0x20].write16 = sram_write_word;
zbank_memory_map[0x20].write = sram_write_byte;
}
}
/* S&K lock-on chip */
@ -857,10 +900,13 @@ static void mapper_sega_w(uint32 data)
/* 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].write8 = m68k_unused_8_w;
m68k.memory_map[i].write16 = m68k_unused_16_w;
zbank_memory_map[i].write = zbank_unused_w;
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;
}
}
}
@ -907,10 +953,10 @@ static void mapper_sf001_w(uint32 address, uint32 data)
m68k.memory_map[i].base = cart.rom + (i << 16);
m68k.memory_map[i].read8 = m68k_read_bus_8;
m68k.memory_map[i].read16 = m68k_read_bus_16;
m68k.memory_map[i].write8 = m68k_unused_8_w;
m68k.memory_map[i].write16 = m68k_unused_16_w;
m68k.memory_map[i].write8 = (i > 0x00) ? m68k_unused_8_w : mapper_sf001_w;
m68k.memory_map[i].write16 = (i > 0x00) ? m68k_unused_16_w : mapper_sf001_w;
zbank_memory_map[i].read = zbank_unused_r;
zbank_memory_map[i].write = m68k_unused_8_w;
zbank_memory_map[i].write = (i > 0x00) ? m68k_unused_8_w : mapper_sf001_w;
}
}
@ -939,12 +985,12 @@ static void mapper_sf001_w(uint32 address, uint32 data)
while (i<0x40)
{
m68k.memory_map[i].base = sram.sram;
m68k.memory_map[i].read8 = NULL;
m68k.memory_map[i].read16 = NULL;
m68k.memory_map[i].write8 = NULL;
m68k.memory_map[i].write16 = NULL;
zbank_memory_map[i].read = NULL;
zbank_memory_map[i].write = NULL;
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;
i++;
}
}
@ -956,10 +1002,10 @@ static void mapper_sf001_w(uint32 address, uint32 data)
m68k.memory_map[i].base = cart.rom + (i << 16);
m68k.memory_map[i].read8 = NULL;
m68k.memory_map[i].read16 = NULL;
m68k.memory_map[i].write8 = m68k_unused_8_w;
m68k.memory_map[i].write16 = m68k_unused_16_w;
m68k.memory_map[i].write8 = (i > 0x00) ? m68k_unused_8_w : mapper_sf001_w;
m68k.memory_map[i].write16 = (i > 0x00) ? m68k_unused_16_w : mapper_sf001_w;
zbank_memory_map[i].read = NULL;
zbank_memory_map[i].write = m68k_unused_8_w;
zbank_memory_map[i].write = (i > 0x00) ? m68k_unused_8_w : mapper_sf001_w;
}
}
@ -1023,12 +1069,12 @@ static void mapper_sf004_w(uint32 address, uint32 data)
/* 32KB static RAM mirrored into $200000-$2FFFFF (odd bytes only) */
for (i=0x20; i<0x30; i++)
{
m68k.memory_map[i].read8 = NULL;
m68k.memory_map[i].read16 = NULL;
m68k.memory_map[i].write8 = NULL;
m68k.memory_map[i].write16 = NULL;
zbank_memory_map[i].read = NULL;
zbank_memory_map[i].write = NULL;
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;
}
}
else

33
core/cart_hw/sram.c
View File

@ -37,15 +37,9 @@
****************************************************************************************/
#include "shared.h"
#include "eeprom_i2c.h"
T_SRAM sram;
static unsigned int sram_read_byte(unsigned int address);
static unsigned int sram_read_word(unsigned int address);
static void sram_write_byte(unsigned int address, unsigned int data);
static void sram_write_word(unsigned int address, unsigned int data);
/****************************************************************************
* A quick guide to external RAM on the Genesis
*
@ -194,44 +188,25 @@ void sram_init()
sram.on = 1;
}
}
/* autodetect games with serial EEPROM */
eeprom_i2c_init();
/* initialize m68k bus handlers (if not already done) */
if (sram.on && !sram.custom)
{
/* disabled on startup if ROM is mapped in same area */
if (cart.romsize <= sram.start)
{
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;
}
}
}
static unsigned int sram_read_byte(unsigned int address)
unsigned int sram_read_byte(unsigned int address)
{
return sram.sram[address & 0xffff];
}
static unsigned int sram_read_word(unsigned int address)
unsigned int sram_read_word(unsigned int address)
{
address &= 0xfffe;
return (sram.sram[address + 1] | (sram.sram[address] << 8));
}
static void sram_write_byte(unsigned int address, unsigned int data)
void sram_write_byte(unsigned int address, unsigned int data)
{
sram.sram[address & 0xffff] = data;
}
static void sram_write_word(unsigned int address, unsigned int data)
void sram_write_word(unsigned int address, unsigned int data)
{
address &= 0xfffe;
sram.sram[address] = data >> 8;

4
core/cart_hw/sram.h
View File

@ -52,6 +52,10 @@ typedef struct
/* Function prototypes */
extern void sram_init();
extern unsigned int sram_read_byte(unsigned int address);
extern unsigned int sram_read_word(unsigned int address);
extern void sram_write_byte(unsigned int address, unsigned int data);
extern void sram_write_word(unsigned int address, unsigned int data);
/* global variables */
extern T_SRAM sram;

22
core/input_hw/lightgun.c
View File

@ -129,14 +129,25 @@ void lightgun_refresh(int port)
}
}
/* External Interrupt ? */
/* External Interrupt enabled ? */
if (reg[11] & 0x08)
{
m68k_update_irq(2);
}
/* HACK: force HV Counter latch (some games does not lock HV Counter but instead use larger offset value) */
hvc_latch = 0x10000 | (y << 8);
/* HVC latch enabled ? */
if (reg[0] & 0x02)
{
/* line accurate V-Counter value */
hvc_latch = 0x10000 | (y << 8);
}
else
{
/* HACK: force HVC latch even when disabled (a few games does not lock HV Counter but instead applies larger offset value) */
hvc_latch = 0x20000 | (y << 8);
}
/* pixel accurate H-Counter value */
if (reg[12] & 1)
{
hvc_latch |= hc_320[((x / 2) + input.x_offset) % 210];
@ -147,6 +158,11 @@ void lightgun_refresh(int port)
}
}
}
else if (hvc_latch & 0x20000)
{
/* HVC should be free-running on other lines when latch is disabled (fixes "Gunfight - 3 in 1" randomization) */
hvc_latch = 0;
}
}
}

39
core/vdp_ctrl.c
View File

@ -1362,42 +1362,34 @@ unsigned int vdp_hvc_r(unsigned int cycles)
int vc;
unsigned int data = hvc_latch;
/* Check if HVC is frozen */
if (!data)
/* Check if HVC latch is enabled */
if (data)
{
/* Cycle-accurate HCounter (Striker, Mickey Mania, Skitchin, Road Rash I,II,III, Sonic 3D Blast...) */
data = hctab[cycles % MCYCLES_PER_LINE];
}
else
{
/* Mode 5: HV counters are frozen (cf. lightgun games & Sunset Riders) */
if (reg[1] & 4)
/* Mode 5: HV-counters are frozen (cf. lightgun games, Sunset Riders logo) */
if (reg[1] & 0x04)
{
/* check if HVC is really locked or is read within INT2 callback (HVC latch is forced for lightgun emulation, cf. lightgun.c) */
if ((reg[0] & 0x02) || (m68k.int_mask == 0x0200))
{
#ifdef LOGVDP
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));
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));
#endif
/* return latched HVC value */
return (data & 0xffff);
}
/* HV counters should be free-running (fixes "Gunfight - 3 in 1" randomization when Justifiers are enabled) */
hvc_latch = 0;
data = hctab[cycles % MCYCLES_PER_LINE];
/* return latched HVC value */
return (data & 0xffff);
}
else
{
/* Mode 4: V counter runs normally, H counter is frozen */
/* Mode 4: by default, V-counter runs normally & H counter is frozen */
data &= 0xff;
}
}
else
{
/* Cycle-accurate H-Counter (Striker, Mickey Mania, Skitchin, Road Rash I,II,III, Sonic 3D Blast...) */
data = hctab[cycles % MCYCLES_PER_LINE];
}
/* Cycle-accurate VCounter (cycle counter starts from line -1) */
/* Cycle-accurate V-Counter (cycle counter starts from line -1) */
vc = (cycles / MCYCLES_PER_LINE) - 1;
/* VCounter overflow */
/* V-Counter overflow */
if (vc > vc_max)
{
vc -= lines_per_frame;
@ -1413,6 +1405,7 @@ unsigned int vdp_hvc_r(unsigned int cycles)
vc = (vc & ~1) | ((vc >> 8) & 1);
}
/* return H-Counter in LSB & V-Counter in MSB */
data |= ((vc & 0xff) << 8);
#ifdef LOGVDP