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[Core/MD] fixed Realtec mapper behavior on soft-reset and with TMSS hardware

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This commit is contained in:
ekeeke 2023-03-12 18:27:34 +01:00
parent cc60ba57bf
commit 1bf6f70986
3 changed files with 41 additions and 18 deletions
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1
HISTORY.txt
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@ -68,6 +68,7 @@ Genesis Plus GX 1.7.5 (xx/xx/xxxx) (Eke-Eke)
* improved console region auto-detection for a few PAL-only games (The Smurfs Travel the World & Williams Arcade's Greatest Hits)
* improved I2C EEPROM boards emulation accuracy
* improved SVP memory handlers accuracy (fixes Virtua Racing debug mode)
* fixed Realtec mapper behavior on soft-reset and with TMSS hardware
* fixed Game Genie / Pro Action Replay lock-on support when Mega CD hardware is enabled
* fixed Game Genie / Pro Action Replay lock-on support with games larger than 8MB
* fixed SRAM support in Triple Play 96 & Triple Play - Gold Edition

56
core/cart_hw/md_cart.c
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@ -2,7 +2,7 @@
* Genesis Plus
* Mega Drive cartridge hardware support
*
* Copyright (C) 2007-2021 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2007-2023 Eke-Eke (Genesis Plus GX)
*
* Many cartridge protections were initially documented by Haze
* (http://haze.mameworld.info/)
@ -71,6 +71,7 @@ static uint32 mapper_flashkit_r(uint32 address);
static uint32 mapper_smw_64_r(uint32 address);
static void mapper_smw_64_w(uint32 address, uint32 data);
static void mapper_realtec_w(uint32 address, uint32 data);
static uint32 mapper_realtec_r(uint32 address);
static void mapper_seganet_w(uint32 address, uint32 data);
static void mapper_32k_w(uint32 data);
static void mapper_64k_w(uint32 data);
@ -503,15 +504,12 @@ void md_cart_init(void)
memcpy(cart.rom + 0x400000 + i*0x2000, cart.rom + 0x7e000, 0x2000);
}
/* Boot ROM (8KB mirrored) is mapped to $000000-$3FFFFF */
for (i=0x00; i<0x40; i++)
{
m68k.memory_map[i].base = cart.rom + 0x400000;
}
/* specific read handler for ROM header area */
m68k.memory_map[0].read16 = mapper_realtec_r;
}
/* detect specific mappers */
if (strstr(rominfo.consoletype,"SEGA SSF"))
else if (strstr(rominfo.consoletype,"SEGA SSF"))
{
/* Everdrive extended SSF mapper */
cart.hw.time_w = mapper_512k_w;
@ -803,8 +801,18 @@ void md_cart_reset(int hard_reset)
{
int i;
/* Realtec mapper */
if (cart.hw.realtec)
{
/* Boot ROM (8KB mirrored) is mapped to $000000-$3FFFFF */
for (i=0x00; i<0x40; i++)
{
m68k.memory_map[i].base = cart.rom + 0x400000;
}
}
/* reset cartridge mapping */
if (cart.hw.bankshift)
else if (cart.hw.bankshift)
{
for (i=0x00; i<0x40; i++)
{
@ -1615,7 +1623,7 @@ static uint32 mapper_smw_64_r(uint32 address)
}
/*
Realtec ROM bankswitch (Earth Defend, Balloon Boy & Funny World, Whac-A-Critter)
Realtec ROM bankswitch (Earth Defend, Balloon Boy & Funny World, Whac-A-Critter, Tom Clown)
(Note: register usage is inverted in TascoDlx documentation)
*/
static void mapper_realtec_w(uint32 address, uint32 data)
@ -1659,6 +1667,19 @@ static void mapper_realtec_w(uint32 address, uint32 data)
}
}
static uint32 mapper_realtec_r(uint32 address)
{
/* /VRES is asserted to bypass TMSS licensing screen when first read access to cartridge ROM header is detected */
if ((address == 0x100) && (m68k.memory_map[0].base = cart.base))
{
/* asserting /VRES from cartridge should only reset 68k CPU (TODO: confirm this on real hardware) */
m68k_pulse_reset();
}
/* default ROM area read handler */
return *(uint16 *)(m68k.memory_map[0].base + (address & 0xfffe));
}
/* Game no Kanzume Otokuyou ROM Mapper */
static void mapper_seganet_w(uint32 address, uint32 data)
{
@ -1959,23 +1980,24 @@ static uint32 mapper_128k_radica_r(uint32 address)
/*
Custom logic (ST 16S25HB1 PAL) used in Micro Machines US cartridge (SR16V1.1 board)
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
/VRES is asserted after write access to 0xA14101 (TMSS bank-shift register)
with D0=1 (cartridge ROM access enabled instead of TMSS Boot ROM) being detected
Custom logic (ST 16S25HB1 PAL) used in Micro Machines USA cartridge (SR16V1.1 board)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
/VRES is asserted to bypass TMSS security checks when write access to 0xA141xx
with D0=1 is detected (access to cartridge ROM enabled instead of TMSS Boot ROM)
*/
static void mapper_sr16v1_w(uint32 address, uint32 data)
{
/* 0xA10000-0xA1FFFF address range is mapped to I/O and Control registers */
/* default I/O and Control registers write handler */
ctrl_io_write_byte(address, data);
/* cartridge uses /LWR, /AS and VA1-VA18 (only VA8-VA17 required to decode access to TMSS bank-shift register) */
/* cartridge uses /LWR, /AS and VA1-VA18 (only VA8-VA17 are required to decode access to TMSS bankswitch register) */
if ((address & 0xff01) == 0x4101)
{
/* cartridge ROM is enabled when D0=1 */
/* check if cartridge ROM is enabled (D0=1) */
if (data & 0x01)
{
gen_reset(0);
/* asserting /VRES from cartridge should only reset 68k CPU (TODO: confirm this on real hardware) */
m68k_pulse_reset();
}
}
}

2
core/cart_hw/md_cart.h
View File

@ -2,7 +2,7 @@
* Genesis Plus
* Mega Drive cartridge hardware support
*
* Copyright (C) 2007-2021 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2007-2023 Eke-Eke (Genesis Plus GX)
*
* Most cartridge protections were initially documented by Haze
* (http://haze.mameworld.info/)