void poke(ushort addr, byte data)
{
addr &= 0x3f;
switch (addr)
{
// INPUT PORT CONTROL
// Only the first four bits of INPTCTRL are used:
// D0: lock mode (after this bit has been set high, no more mode changes can be done until the console is turned off)
// D1: 0=disable MARIA (only RIOT RAM is available); 1=enable MARIA (also enables system RAM)
// D2: 0=enable BIOS at $8000-$FFFF (actually NTSC only uses 4KB and PAL uses 16KB); 1=disable BIOS and enable cartridge
// D3: 0=disable TIA video pull-ups (video output is MARIA instead of TIA); 1=enable TIA video pull-ups (video output is TIA instead of MARIA)
//
case INPTCTRL:
if (CtrlLock)
{
Log("Maria: INPTCTRL: LOCKED: Ignoring: ${0:x2}, PC=${1:x4}", data, M.CPU.PC);
break;
}
CtrlLock = (data & (1 << 0)) != 0;
var mariaEnable = (data & (1 << 1)) != 0;
var biosDisable = (data & (1 << 2)) != 0;
var tiaopEnable = (data & (1 << 3)) != 0;
Log("Maria: INPTCTRL: ${0:x2}, PC=${1:x4}, lockMode={2}, mariaEnable={3} biosDisable={4} tiaOutput={5}",
data, M.CPU.PC, CtrlLock, mariaEnable, biosDisable, tiaopEnable);
if (biosDisable)
{
M.SwapOutBIOS();
}
else
{
M.SwapInBIOS();
}
break;
case WSYNC:
// Request a CPU preemption to service the delay request
M.CPU.EmulatorPreemptRequest = true;
break;
case CTRL:
ColorKill = (data & 0x80) != 0;
DMAEnabled = (data & 0x60) == 0x40;
CWidth = (data & 0x10) != 0;
BCntl = (data & 0x08) != 0;
Kangaroo = (data & 0x04) != 0;
RM = (byte)(data & 0x03);
break;
case MSTAT:
break;
case CHARBASE:
case DPPH:
case DPPL:
Registers[addr] = data;
break;
case BACKGRND:
case P0C1:
case P0C2:
case P0C3:
case P1C1:
case P1C2:
case P1C3:
case P2C1:
case P2C2:
case P2C3:
case P3C1:
case P3C2:
case P3C3:
case P4C1:
case P4C2:
case P4C3:
case P5C1:
case P5C2:
case P5C3:
case P6C1:
case P6C2:
case P6C3:
case P7C1:
case P7C2:
case P7C3:
Registers[addr] = data;
break;
case AUDC0:
case AUDC1:
case AUDF0:
case AUDF1:
case AUDV0:
case AUDV1:
TIASound.Update(addr, data);
break;
case OFFSET:
Log("Maria: OFFSET: ROM wrote ${0:x2}, PC=${1:x4} (reserved for future expansion)", data, M.CPU.PC);
break;
default:
Registers[addr] = data;
LogDebug("Maria: Unhandled poke:${0:x4} w/${1:x2}, PC=${2:x4}", addr, data, M.CPU.PC);
break;
}
}
