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implement PRG delay

This commit is contained in:
alyosha-tas 2016-04-09 09:33:13 -04:00
parent 9d0d7fa85a
commit 3e14c07c51
1 changed files with 39 additions and 7 deletions
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46
BizHawk.Emulation.Cores/Consoles/Atari/2600/Tia/TIA.cs
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@ -292,6 +292,11 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
private bool enam0_val = false;
private bool enam1_val = false;
private int prg0_delay = 0;
private int prg1_delay = 0;
private byte prg0_val = 0;
private byte prg1_val = 0;
private bool do_ticks = false;
private byte _hsyncCnt;
private int _capChargeStart;
@ -472,6 +477,34 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
}
// delay latch to player graphics registers
if (prg0_delay > 0)
{
prg0_delay++;
if (prg0_delay == 3)
{
prg0_delay = 0;
_player0.Grp = prg0_val;
_player1.Dgrp = _player1.Grp;
}
}
if (prg1_delay > 0)
{
prg1_delay++;
if (prg1_delay == 3)
{
prg1_delay = 0;
_player1.Grp = prg1_val;
_player0.Dgrp = _player0.Grp;
// TODO: Find a game that uses this functionality and test it
_ball.Denabled = _ball.Enabled;
}
}
// Reset the RDY flag when we reach hblank
if (_hsyncCnt <= 0)
{
@ -1234,16 +1267,15 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
}
else if (maskedAddr == 0x1B) // GRP0
{
_player0.Grp = value;
_player1.Dgrp = _player1.Grp;
prg0_val = value;
prg0_delay = 1;
}
else if (maskedAddr == 0x1C) // GRP1
{
_player1.Grp = value;
_player0.Dgrp = _player0.Grp;
// TODO: Find a game that uses this functionality and test it
_ball.Denabled = _ball.Enabled;
prg1_val = value;
prg1_delay = 1;
}
else if (maskedAddr == 0x1D) // ENAM0
{