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[Core/MD] added support for Everdrive extended SSF mapper

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This commit is contained in:
EkeEke 2014-09-17 23:37:40 +02:00
parent 99e632a183
commit 200f9a7349
1 changed files with 35 additions and 13 deletions
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48
core/cart_hw/md_cart.c
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@ -60,6 +60,7 @@ typedef struct
/* Function prototypes */ /* Function prototypes */
static void mapper_sega_w(uint32 data); static void mapper_sega_w(uint32 data);
static void mapper_512k_w(uint32 address, uint32 data);
static void mapper_ssf2_w(uint32 address, uint32 data); static void mapper_ssf2_w(uint32 address, uint32 data);
static void mapper_sf001_w(uint32 address, uint32 data); static void mapper_sf001_w(uint32 address, uint32 data);
static void mapper_sf002_w(uint32 address, uint32 data); static void mapper_sf002_w(uint32 address, uint32 data);
@ -568,7 +569,15 @@ void md_cart_init(void)
} }
/* detect specific mappers */ /* detect specific mappers */
if (strstr(rominfo.domestic,"SUPER STREET FIGHTER2")) if (strstr(rominfo.consoletype,"SEGA SSF"))
{
/* Everdrive extended SSF mapper */
cart.hw.bankshift = 1;
/* specific !TIME handler */
cart.hw.time_w = mapper_512k_w;
}
else if (strstr(rominfo.domestic,"SUPER STREET FIGHTER2"))
{ {
/* SSF2 mapper */ /* SSF2 mapper */
cart.hw.bankshift = 1; cart.hw.bankshift = 1;
@ -912,25 +921,38 @@ static void mapper_sega_w(uint32 data)
} }
} }
/*
Everdrive extended SSF ROM bankswitch
documented by Krikzz (http://krikzz.com/pub/support/mega-ed/dev/extended_ssf.txt)
*/
static void mapper_512k_w(uint32 address, uint32 data)
{
uint32 i;
/* 512K ROM paging */
uint8 *src = cart.rom + (data << 19);
/* cartridge area ($000000-$3FFFFF) is divided into 8 x 512K banks */
address = (address << 2) & 0x38;
/* remap selected ROM page to selected bank */
for (i=0; i<8; i++)
{
m68k.memory_map[address++].base = src + (i<<16);
}
}
/* /*
Super Street Fighter 2 ROM bankswitch Super Street Fighter 2 ROM bankswitch
documented by Bart Trzynadlowski (http://www.trzy.org/files/ssf2.txt) documented by Bart Trzynadlowski (http://emu-docs.org/Genesis/ssf2.txt)
*/ */
static void mapper_ssf2_w(uint32 address, uint32 data) static void mapper_ssf2_w(uint32 address, uint32 data)
{ {
/* 8 x 512k banks */ /* only banks 1-7 are remappable, bank 0 remains unchanged */
address = (address << 2) & 0x38;
/* bank 0 remains unchanged */
if (address) if (address)
{ {
uint32 i; mapper_512k_w(address, data);
uint8 *src = cart.rom + (data << 19);
for (i=0; i<8; i++)
{
m68k.memory_map[address++].base = src + (i<<16);
}
} }
} }