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[Core/MD] added (very basic) emulation of Flashkit MD hardware

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This commit is contained in:
EkeEke 2017-07-06 01:16:58 +02:00
parent 2a19462f0d
commit 07f333b1ed
6 changed files with 50 additions and 2 deletions
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1
HISTORY.txt
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@ -43,6 +43,7 @@ Genesis Plus GX 1.7.5 (xx/xx/xxxx) (Eke-Eke)
---------------
* added support for some new unlicensed games with copy protection (Thunderbolt II, Tom Clown, Chaoji Puke / Super Poker)
* added support for Everdrive extended SSF mapper
* added (very basic) emulation of Flashkit MD hardware
* 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)

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builds/genesis_plus_gx_libretro.dll
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builds/genplus_cube.dol
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49
core/cart_hw/md_cart.c
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@ -2,7 +2,7 @@
* Genesis Plus
* Mega Drive cartridge hardware support
*
* Copyright (C) 2007-2016 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2007-2017 Eke-Eke (Genesis Plus GX)
*
* Many cartridge protections were initially documented by Haze
* (http://haze.mameworld.info/)
@ -65,6 +65,8 @@ static void mapper_sf004_w(uint32 address, uint32 data);
static uint32 mapper_sf004_r(uint32 address);
static void mapper_t5740_w(uint32 address, uint32 data);
static uint32 mapper_t5740_r(uint32 address);
static void mapper_flashkit_w(uint32 address, uint32 data);
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);
@ -628,6 +630,13 @@ void md_cart_init(void)
zbank_memory_map[i].write = zbank_unused_w;
}
}
else if (strstr(rominfo.ROMType,"GM") && strstr(rominfo.product,"00000000-42"))
{
/* Flashkit MD mapper */
m68k.memory_map[0x00].write8 = mapper_flashkit_w;
m68k.memory_map[0x00].write16 = mapper_flashkit_w;
zbank_memory_map[0x00].write = mapper_flashkit_w;
}
else if ((*(uint16 *)(cart.rom + 0x08) == 0x6000) && (*(uint16 *)(cart.rom + 0x0a) == 0x01f6) && (rominfo.realchecksum == 0xf894))
{
/* Super Mario World 64 (unlicensed) mapper */
@ -1267,6 +1276,44 @@ static uint32 mapper_t5740_r(uint32 address)
return READ_BYTE(cart.rom, address);
}
/*
FlashKit MD mapper (very limited M29W320xx Flash memory support -- enough for unlicensed games using device signature as protection)
*/
static void mapper_flashkit_w(uint32 address, uint32 data)
{
/* Increment Bus Write counter */
cart.hw.regs[0]++;
/* Wait for 3 consecutive bus writes */
if (cart.hw.regs[0] == 3)
{
/* assume 'Auto Select' command */
m68k.memory_map[0x0].read16 = mapper_flashkit_r;
}
else if (cart.hw.regs[0] == 4)
{
/* assume 'Read/Reset' command */
m68k.memory_map[0x0].read16 = NULL;
/* reset Bus Write counter */
cart.hw.regs[0] = 0;
}
}
static uint32 mapper_flashkit_r(uint32 address)
{
/* hard-coded device signature */
switch (address & 0x06)
{
case 0x00: /* Manufacturer Code (STMicroelectronics) */
return 0x0020;
case 0x02: /* Device Code (M29W320EB) */
return 0x2257;
default: /* not supported */
return 0xffff;
}
}
/*
Super Mario World 64 (unlicensed) mapper
*/

2
core/cart_hw/md_cart.h
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@ -2,7 +2,7 @@
* Genesis Plus
* Mega Drive cartridge hardware support
*
* Copyright (C) 2007-2016 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2007-2017 Eke-Eke (Genesis Plus GX)
*
* Most cartridge protections were initially documented by Haze
* (http://haze.mameworld.info/)