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commodore64- fixed VIC interrupts not being cleared

This commit is contained in:
saxxonpike 2012-11-06 15:32:14 +00:00
parent 47a556b326
commit 13b6498ca9
1 changed files with 12 additions and 9 deletions
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21
BizHawk.Emulation/Computers/Commodore64/VicII.cs
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@ -797,11 +797,7 @@ namespace BizHawk.Emulation.Computers.Commodore64
rasterOffsetX++;
}
// check for anything that would've triggered an interrupt and raise the flag if so
if ((regs.IRST & regs.ERST) || (regs.IMMC & regs.EMMC) || (regs.IMBC & regs.EMBC) || (regs.ILP & regs.ELP))
{
regs.IRQ = true;
}
UpdateInterrupts();
signal.VicIRQ = regs.IRQ;
@ -920,6 +916,12 @@ namespace BizHawk.Emulation.Computers.Commodore64
borderRight = regs.CSEL ? 0x157 : 0x14E;
}
public void UpdateInterrupts()
{
// check for anything that would've triggered an interrupt and raise the flag if so
regs.IRQ = ((regs.IRST & regs.ERST) || (regs.IMMC & regs.EMMC) || (regs.IMBC & regs.EMBC) || (regs.ILP & regs.ELP));
}
public void Write(ushort addr, byte val)
{
addr &= 0x3F;
@ -946,14 +948,15 @@ namespace BizHawk.Emulation.Computers.Commodore64
break;
case 0x19:
// only allow clearing of these flags
if ((val & 0x01) == 0x00)
if ((val & 0x01) != 0x00)
regs.IRST = false;
if ((val & 0x02) == 0x00)
if ((val & 0x02) != 0x00)
regs.IMBC = false;
if ((val & 0x04) == 0x00)
if ((val & 0x04) != 0x00)
regs.IMMC = false;
if ((val & 0x08) == 0x00)
if ((val & 0x08) != 0x00)
regs.ILP = false;
UpdateInterrupts();
break;
case 0x1E:
case 0x1F: