ShuriZma
/
BizHawk
mirror of https://github.com/TASEmulators/BizHawk.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Added files via upload 

implements PF delays
This commit is contained in:
alyosha-tas 2016-04-08 09:12:03 -04:00
parent e96f057bd2
commit 5e4874a870
1 changed files with 111 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

121
BizHawk.Emulation.Cores/Consoles/Atari/2600/Tia/TIA.cs
View File

@ -273,6 +273,20 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
private int test_count_m0;
private int test_count_m1;
private int test_count_b;
private byte pf0_update = 0;
private byte pf1_update = 0;
private byte pf2_update = 0;
private bool pf0_updater = false;
private bool pf1_updater = false;
private bool pf2_updater = false;
private byte pf0_delay_clock = 0;
private byte pf1_delay_clock = 0;
private byte pf2_delay_clock = 0;
private byte pf0_max_delay = 0;
private byte pf1_max_delay = 0;
private byte pf2_max_delay = 0;
private bool do_ticks = false;
private byte _hsyncCnt;
private int _capChargeStart;
@ -401,8 +415,37 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
{
// Still ignoring cycles...
// Reset the RDY flag when we reach hblank
if (_hsyncCnt <= 0)
//delay latch to new playfield register
if (pf0_updater==true)
{
pf0_delay_clock++;
if (pf0_delay_clock > pf0_max_delay)
{
_playField.Grp = (uint)((_playField.Grp & 0x0FFFF) + ((ReverseBits(pf0_update, 8) & 0x0F) << 16));
pf0_updater = false;
}
}
if (pf1_updater == true)
{
pf1_delay_clock++;
if (pf1_delay_clock > pf1_max_delay)
{
_playField.Grp = (uint)((_playField.Grp & 0xF00FF) + (pf1_update << 8));
pf1_updater = false;
}
}
if (pf2_updater == true)
{
pf2_delay_clock++;
if (pf2_delay_clock > pf2_max_delay)
{
_playField.Grp = (uint)((_playField.Grp & 0xFFF00) + ReverseBits(pf2_update, 8));
pf2_updater = false;
}
}
// Reset the RDY flag when we reach hblank
if (_hsyncCnt <= 0)
{
_core.Cpu.RDY = true;
}
@ -795,7 +838,7 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
_hmove.HMoveCnt++;
_hmove.HMoveCnt %= 4;
}
// whether this is 5 or 6 needs to be investigated a bit further, but 5 seems to be correct
if (_hmove.HMoveDelayCnt < 5)
{
_hmove.HMoveDelayCnt++;
@ -980,7 +1023,7 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
}
else if (maskedAddr == 0x08) // COLUPF
{
_playField.PfColor = (byte)(value & 0xFE);
_playField.PfColor = (byte)(value & 0xFE);
}
else if (maskedAddr == 0x09) // COLUBK
{
@ -1004,16 +1047,74 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
}
else if (maskedAddr == 0x0D) // PF0
{
_playField.Grp = (uint)((_playField.Grp & 0x0FFFF) + ((ReverseBits(value, 8) & 0x0F) << 16));
}
pf0_update = value;
pf0_updater = true;
pf0_delay_clock = 0;
if (((_hsyncCnt / 3) & 3) == 0)
{
pf0_max_delay = 4;
}
if (((_hsyncCnt / 3) & 3) == 1)
{
pf0_max_delay = 5;
}
if (((_hsyncCnt / 3) & 3) == 2)
{
pf0_max_delay = 2;
}
if (((_hsyncCnt / 3) & 3) == 3)
{
pf0_max_delay = 3;
}
//_playField.Grp = (uint)((_playField.Grp & 0x0FFFF) + ((ReverseBits(value, 8) & 0x0F) << 16));
}
else if (maskedAddr == 0x0E) // PF1
{
_playField.Grp = (uint)((_playField.Grp & 0xF00FF) + (value << 8));
}
pf1_update = value;
pf1_updater = true;
pf1_delay_clock = 0;
if (((_hsyncCnt / 3) & 3) == 0)
{
pf1_max_delay = 4;
}
if (((_hsyncCnt / 3) & 3) == 1)
{
pf1_max_delay = 5;
}
if (((_hsyncCnt / 3) & 3) == 2)
{
pf1_max_delay = 2;
}
if (((_hsyncCnt / 3) & 3) == 3)
{
pf1_max_delay = 3;
}
//_playField.Grp = (uint)((_playField.Grp & 0xF00FF) + (value << 8));
}
else if (maskedAddr == 0x0F) // PF2
{
_playField.Grp = (uint)((_playField.Grp & 0xFFF00) + ReverseBits(value, 8));
}
pf2_update = value;
pf2_updater = true;
pf2_delay_clock = 0;
if (((_hsyncCnt / 3) & 3) == 0)
{
pf2_max_delay = 4;
}
if (((_hsyncCnt / 3) & 3) == 1)
{
pf2_max_delay = 5;
}
if (((_hsyncCnt / 3) & 3) == 2)
{
pf2_max_delay = 2;
}
if (((_hsyncCnt / 3) & 3) == 3)
{
pf2_max_delay = 3;
}
//_playField.Grp = (uint)((_playField.Grp & 0xFFF00) + ReverseBits(value, 8));
}
else if (maskedAddr == 0x10) // RESP0
{
// Borrowed from EMU7800. Apparently resetting between 68 and 76 has strange results.