The-Homebrew-Cloud/Genesis-Plus-GX
2
0
Fork 0
mirror of https://github.com/ekeeke/Genesis-Plus-GX.git synced 2024-11-10 21:05:12 +01:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

48
core/cart_hw/md_cart.c
View File

@ -60,6 +60,7 @@ typedef struct
/* Function prototypes */
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_sf001_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 */
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 */
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
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)
{
/* 8 x 512k banks */
address = (address << 2) & 0x38;
/* bank 0 remains unchanged */
/* only banks 1-7 are remappable, bank 0 remains unchanged */
if (address)
{
uint32 i;
uint8 *src = cart.rom + (data << 19);
for (i=0; i<8; i++)
{
m68k.memory_map[address++].base = src + (i<<16);
}
mapper_512k_w(address, data);
}
}