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Add vblank delay to fix 4A50 demo game

This commit is contained in:
alyosha-tas 2016-05-25 18:10:05 -04:00
parent cbad691741
commit d192d76052
1 changed files with 23 additions and 2 deletions
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25
BizHawk.Emulation.Cores/Consoles/Atari/2600/Tia/TIA.cs
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@ -291,6 +291,9 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
private bool enam1_val;
private bool enamb_val;
private int vblank_delay;
private byte vblank_value;
private bool p0_stuff;
private bool p1_stuff;
private bool m0_stuff;
@ -417,6 +420,8 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
_capChargeStart = 0;
_capCharging = false;
_vblankEnabled = false;
vblank_delay = 0;
vblank_value = 0;
_vsyncEnabled = false;
_CurrentScanLine = 0;
_audioClocks = 0;
@ -476,6 +481,20 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
{
// Still ignoring cycles...
// delay vblank latch
if (vblank_delay > 0)
{
vblank_delay++;
if (vblank_delay==3)
{
_vblankEnabled = (vblank_value & 0x02) != 0;
vblank_delay = 0;
}
}
//delay latch to new playfield register
if (pf0_updater == true)
{
@ -1172,7 +1191,8 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
}
else if (maskedAddr == 0x01) // VBLANK
{
_vblankEnabled = (value & 0x02) != 0;
vblank_delay = 1;
vblank_value = value;
_capCharging = (value & 0x80) == 0;
if ((value & 0x80) == 0)
{
@ -1642,7 +1662,8 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
ser.Sync("Ticks", ref do_ticks);
ser.Sync("VBlankDelay", ref vblank_delay);
ser.Sync("VBlankValue", ref vblank_value);
// some of these things weren't in the state because they weren't needed if
// states were always taken at frame boundaries