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m227: Implement chr-ram write protect

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This commit is contained in:
negativeExponent
2020-02-19 20:16:09 +08:00
parent ada91d3a78
commit 7c6aa2d665
1 changed files with 9 additions and 0 deletions
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9
src/boards/addrlatch.c
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@@ -27,6 +27,7 @@ static void (*WSync)(void);
static readfunc defread; static readfunc defread;
static uint8 *WRAM = NULL; static uint8 *WRAM = NULL;
static uint32 WRAMSIZE; static uint32 WRAMSIZE;
static uint32 hasBattery;
static DECLFW(LatchWrite) { static DECLFW(LatchWrite) {
latche = A; latche = A;
@@ -65,6 +66,7 @@ static void Latch_Init(CartInfo *info, void (*proc)(void), readfunc func, uint16
addrreg0 = adr0; addrreg0 = adr0;
addrreg1 = adr1; addrreg1 = adr1;
WSync = proc; WSync = proc;
hasBattery = 0;
if (func != NULL) if (func != NULL)
defread = func; defread = func;
else else
@@ -77,6 +79,7 @@ static void Latch_Init(CartInfo *info, void (*proc)(void), readfunc func, uint16
WRAM = (uint8*)FCEU_gmalloc(WRAMSIZE); WRAM = (uint8*)FCEU_gmalloc(WRAMSIZE);
SetupCartPRGMapping(0x10, WRAM, WRAMSIZE, 1); SetupCartPRGMapping(0x10, WRAM, WRAMSIZE, 1);
if (info->battery) { if (info->battery) {
hasBattery = 1;
info->SaveGame[0] = WRAM; info->SaveGame[0] = WRAM;
info->SaveGameLen[0] = WRAMSIZE; info->SaveGameLen[0] = WRAMSIZE;
} }
@@ -416,6 +419,12 @@ static void M227Sync(void) {
} }
} }
if (!hasBattery && (latche & 0x80) == 0x80)
/* CHR-RAM write protect hack, needed for some multicarts */
SetupCartCHRMapping(0, CHRptr[0], 0x2000, 0);
else
SetupCartCHRMapping(0, CHRptr[0], 0x2000, 1);
setmirror(((latche >> 1) & 1) ^ 1); setmirror(((latche >> 1) & 1) ^ 1);
setchr8(0); setchr8(0);
setprg8r(0x10, 0x6000, 0); setprg8r(0x10, 0x6000, 0);