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Backport r161 - UNIF OneBus - PCM DMA timing and address fix

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twinaphex
2014-12-08 19:28:27 +01:00
parent 944b48a732
commit 8ac5424da2
1 changed files with 7 additions and 2 deletions
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9
src/boards/onebus.c
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@@ -42,7 +42,7 @@ static uint8 inv_hack = 0; // some OneBus Systems have swapped PRG reg commans
// APU Registers
static uint8 pcm_enable = 0, pcm_irq = 0;
static int16 pcm_addr, pcm_size, pcm_latch, pcm_clock = 0xF6;
static int16 pcm_addr, pcm_size, pcm_latch, pcm_clock = 0xE1;
static writefunc defapuwrite[64];
static readfunc defapuread[64];
@@ -197,10 +197,12 @@ static DECLFW(UNLOneBusWriteAPU40XX) {
if (apu40xx[0x30] & 0x10) {
pcm_addr = V << 6;
}
break;
case 0x13:
if (apu40xx[0x30] & 0x10) {
pcm_size = (V << 4) + 1;
}
break;
case 0x15:
if (apu40xx[0x30] & 0x10) {
pcm_enable = V & 0x10;
@@ -212,6 +214,7 @@ static DECLFW(UNLOneBusWriteAPU40XX) {
pcm_latch = pcm_clock;
V &= 0xef;
}
break;
}
defapuwrite[A & 0x3f](A, V);
}
@@ -224,6 +227,7 @@ static DECLFR(UNLOneBusReadAPU40XX) {
if (apu40xx[0x30] & 0x10) {
result = (result & 0x7f) | pcm_irq;
}
break;
}
return result;
}
@@ -239,7 +243,8 @@ static void UNLOneBusCpuHook(int a) {
pcm_enable = 0;
X6502_IRQBegin(FCEU_IQEXT);
} else {
uint8 raw_pcm = ARead[pcm_addr](pcm_addr) >> 1;
uint16 addr = pcm_addr | ((apu40xx[0x30]^3) << 14);
uint8 raw_pcm = ARead[addr](addr) >> 1;
defapuwrite[0x11](0x4011, raw_pcm);
pcm_addr++;
pcm_addr &= 0x7FFF;