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snes, option to allow writes to vram outside of blanking

This commit is contained in:
dinkc64 2025-02-02 20:48:15 -05:00
parent 135e1f2c52
commit 77f6d1a756
2 changed files with 16 additions and 3 deletions
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15
src/burn/drv/snes/d_snes.cpp
View File

@ -180,6 +180,19 @@ static struct BurnDIPInfo SNESDIPList[] =
STDDIPINFO(SNES)
static struct BurnDIPInfo SNESVRAMHackDIPList[] =
{
DIP_OFFSET(0x19)
{0x00, 0xff, 0xff, 0x01, NULL },
{0x01, 0xff, 0xff, 0x00, NULL },
{0 , 0xfe, 0 , 2, "Allow vram writes outside blanking (hack)" },
{0x00, 0x01, 0x01, 0x00, "Off" },
{0x00, 0x01, 0x01, 0x01, "On" },
};
STDDIPINFO(SNESVRAMHack)
static struct BurnDIPInfo SNESZapperDIPList[] =
{
DIP_OFFSET(0x14)
@ -9424,7 +9437,7 @@ struct BurnDriver BurnDrvsnes_Fireemblem4j = {
"Fire Emblem - Seisen no Keifu (Japan)\0", NULL, "Nintendo", "Nintendo",
L"\u30d5\u30a1\u30a4\u30a2\u30fc\u30a8\u30e0\u30d6\u30ec\u30e0 - \u8056\u6226\u306e\u7cfb\u8b5c (Japan)\0", NULL, NULL, NULL,
BDF_GAME_WORKING, 1, HARDWARE_SNES, GBF_RPG | GBF_STRATEGY, 0,
SNESGetZipName, snes_Fireemblem4jRomInfo, snes_Fireemblem4jRomName, NULL, NULL, NULL, NULL, SNESInputInfo, SNESDIPInfo,
SNESGetZipName, snes_Fireemblem4jRomInfo, snes_Fireemblem4jRomName, NULL, NULL, NULL, NULL, SNESInputInfo, SNESVRAMHackDIPInfo,
DrvInit, DrvExit, DrvFrame, DrvDraw, DrvScan, &DrvRecalc, 0x8000,
512, 448, 4, 3
};

4
src/burn/drv/snes/ppu.cpp
View File

@ -1187,7 +1187,7 @@ void ppu_write(uint8_t adr, uint8_t val) {
}
case 0x18: {
uint16_t vramAdr = ppu_getVramRemap();
if (forcedBlank || snes->inVblank) { // TODO: also cgram and oam?
if (forcedBlank || snes->inVblank || (DrvDips[0] & 1)) { // TODO: also cgram and oam?
vram[vramAdr & 0x7fff] = (vram[vramAdr & 0x7fff] & 0xff00) | val;
}
if(!vramIncrementOnHigh) vramPointer += vramIncrement;
@ -1195,7 +1195,7 @@ void ppu_write(uint8_t adr, uint8_t val) {
}
case 0x19: {
uint16_t vramAdr = ppu_getVramRemap();
if (forcedBlank || snes->inVblank) {
if (forcedBlank || snes->inVblank || (DrvDips[0] & 1)) { // DrvDips[0] & 1 == Allow invalid vram writes, some hack games need this
vram[vramAdr & 0x7fff] = (vram[vramAdr & 0x7fff] & 0x00ff) | (val << 8);
}
if(vramIncrementOnHigh) vramPointer += vramIncrement;