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Fix timer IRQs 

I think this is correct, Druid works now and I didn't notice any problems on zelda.
This commit is contained in:
alyosha-tas 2016-09-05 22:37:47 -04:00 committed by GitHub
parent 83c0cd5778
commit cd9204b5e4
1 changed files with 12 additions and 4 deletions
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16
BizHawk.Emulation.Cores/Consoles/Nintendo/NES/FDS/FDS.cs
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@ -255,12 +255,12 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
case 0x0020:
timerlatch &= 0xff00;
timerlatch |= value;
timerirq = false;
//timerirq = false;
break;
case 0x0021:
timerlatch &= 0x00ff;
timerlatch |= value << 8;
timerirq = false;
//timerirq = false;
break;
case 0x0022:
timerreg = (byte)(value & 3);
@ -344,14 +344,20 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
public override void ClockCPU()
{
if ((timerreg & 2) != 0 && timervalue > 0)
if ((timerreg & 2) != 0)// && timervalue > 0)
{
timervalue--;
if (timervalue!=0)
{
timervalue--;
}
if (timervalue == 0)
{
/*
if ((timerreg & 1) != 0)
{
timervalue = timerlatch;
//timervalue = 0xFFFF;
}
else
{
@ -359,6 +365,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
timervalue = 0;
timerlatch = 0;
}
*/
timervalue = timerlatch;
timerirq = true;
}
}