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Atari 2600 - DPC mapper - clean up elapsed cycle monitoring, results now match up with stella at least

This commit is contained in:
adelikat 2014-04-08 00:24:28 +00:00
parent de89e38d7a
commit 5407d752b1
1 changed files with 6 additions and 7 deletions
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13
BizHawk.Emulation.Cores/Consoles/Atari/2600/Mappers/mDPC.cs
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@ -1,5 +1,4 @@
using System.Linq;
using BizHawk.Common;
using BizHawk.Common;
namespace BizHawk.Emulation.Cores.Atari.Atari2600
{
@ -239,8 +238,8 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
private byte _myRandomNumber;
// TOD: something simpler here, don't need both
private int _mySystemCycles;
private int _systemCycles;
//private int _mySystemCycles;
private int _elapsedCycles = 85; // 85 compensates for a slight timing issue when ClockCpu is first run, 85 puts BizHawk back on track with Stella on elapsed timing values
// Fractional DPC music OSC clocks unused during the last update
private double _myFractionalClocks;
@ -269,7 +268,7 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
public override void ClockCpu()
{
_systemCycles++;
_elapsedCycles++;
}
private byte ReadMem(ushort addr, bool peek)
@ -485,8 +484,8 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
private void UpdateMusicModeDataFetchers()
{
// Calculate the number of cycles since the last update
var cycles = _systemCycles - _mySystemCycles;
_mySystemCycles = _systemCycles;
var cycles = _elapsedCycles;
_elapsedCycles = 0;
// Calculate the number of DPC OSC clocks since the last update
var clocks = ((20000.0 * cycles) / 1193191.66666667) + _myFractionalClocks;