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PCE: Fix a bug in the timer; fix glitch in VBlank interrupt handling (fixing intro in Dungeon Explorer)

This commit is contained in:
beirich 2011-03-19 06:00:33 +00:00
parent 53703fdb04
commit 0a354c2748
3 changed files with 10 additions and 9 deletions
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4
BizHawk.Emulation/CPUs/HuC6280/Execute.cs
View File

@ -2125,10 +2125,10 @@ throw new Exception("break");
if (TimerEnabled)
{
TimerTickCounter += delta;
if (TimerTickCounter >= 1024)
while (TimerTickCounter >= 1024)
{
TimerValue--;
TimerTickCounter &= 1023;
TimerTickCounter -= 1024;
if (TimerValue == 0xFF)
{
TimerValue = TimerReloadValue;

11
BizHawk.Emulation/Consoles/PC Engine/VDC.Render.cs
View File

@ -74,13 +74,14 @@ namespace BizHawk.Emulation.Consoles.TurboGrafx
RenderScanLine();
if (ScanLine == VBlankScanline && VBlankInterruptEnabled)
{
Log.Note("VDC", "Firing VBlank interrupt at {0}", ScanLine);
StatusByte |= StatusVerticalBlanking;
cpu.IRQ1Assert = true;
}
cpu.Execute(2);
cpu.Execute(455-hblankCycles);
if ((StatusByte & StatusVerticalBlanking) > 0)
cpu.IRQ1Assert = true;
cpu.Execute(455-hblankCycles-2);
if (ScanLine == VBlankScanline)
UpdateSpriteAttributeTable();

4
CpuCoreGenerator/HuC6280/CoreGenerator.cs
View File

@ -510,10 +510,10 @@ namespace HuC6280
w.WriteLine(" if (TimerEnabled)");
w.WriteLine(" {");
w.WriteLine(" TimerTickCounter += delta;");
w.WriteLine(" if (TimerTickCounter >= 1024)");
w.WriteLine(" while (TimerTickCounter >= 1024)");
w.WriteLine(" {");
w.WriteLine(" TimerValue--;");
w.WriteLine(" TimerTickCounter &= 1023;");
w.WriteLine(" TimerTickCounter -= 1024;");
w.WriteLine(" if (TimerValue == 0xFF)");
w.WriteLine(" {");
w.WriteLine(" TimerValue = TimerReloadValue;");