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[CPCHawk] Small CRTC1 changes

This commit is contained in:
ASNiVOR 2024-10-14 21:07:12 +01:00
parent 478fc58a5d
commit 62abee4813
1 changed files with 5 additions and 3 deletions
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8
src/BizHawk.Emulation.Cores/Computers/AmstradCPC/Hardware/CRTC.Type1.cs
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@ -64,7 +64,8 @@ namespace BizHawk.Emulation.Cores.Computers.AmstradCPC
ma_store = (Register[R12_START_ADDR_H] << 8) | Register[R13_START_ADDR_L];
}
if (VCC == R7_VerticalSyncPosition) // C4 == R7
if (VCC == R7_VerticalSyncPosition // C4 == R7
&& !VSYNC) // ACCC 16.3: It is not possible to trigger or inhibit VSYNC during a VSYNC
{
// VSYNC enabled
VSYNC = true;
@ -109,7 +110,8 @@ namespace BizHawk.Emulation.Cores.Computers.AmstradCPC
ma_store = ma;
}
if (HCC == R2_HorizontalSyncPosition) // C0 == R2
if (HCC == R2_HorizontalSyncPosition // C0 == R2
&& R3_HorizontalSyncWidth > 0) // ACCC 14.6: When R3 == 0, CRTC 0 and 1 do not produce HSYNC
{
// HSYNC is enabled
HSYNC = true;
@ -124,7 +126,7 @@ namespace BizHawk.Emulation.Cores.Computers.AmstradCPC
HSC++;
if (HSC == R3_HorizontalSyncWidth // C3l == R3l
|| HSC == 0) // HSC counter wrap-around
|| HSC == 0) // HSC counter wrap-around
{
// disable HSYNC
HSYNC = false;