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Add explicit NOPs to the MOS 6502 implementation

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Adrian Conlon committed 2026-05-14 15:17:41 +01:00
1 parent ac200d7f76
commit 8f59e79959
1 file changed
+10 -10
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M6502/MOS6502.cs
+10 -10
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@@ -28,22 +28,22 @@ namespace M6502
case 0x0c: this.Absolute(); NOP(); break; // *NOP (absolute)
case 0x0f: this.Absolute(); this.SLO(); break; // *SLO (absolute)
case 0x12: this.SwallowRead(); this.JAM(); break; // *JAM
case 0x12: this.SwallowRead(); this.JAM(); break; // *JAM
case 0x13: this.IndirectIndexedYAddress(); this.FixupRead(); this.SLO(); break; // *SLO (indirect indexed Y)
case 0x14: this.ZeroPageX(); NOP(); break; // *NOP (zero page, X)
case 0x17: this.ZeroPageX(); this.SLO(); break; // *SLO (zero page, X)
case 0x1a: this.SwallowRead(); NOP(); break; // *NOP (implied)
case 0x1b: this.AbsoluteYAddress(); this.FixupRead(); this.SLO(); break; // *SLO (absolute, Y)
case 0x1c: this.AbsoluteXAddress(); this.MaybeFixupRead(); break; // *NOP (absolute, X)
case 0x1c: this.AbsoluteXAddress(); this.MaybeFixupRead(); NOP(); break; // *NOP (absolute, X)
case 0x1f: this.AbsoluteXAddress(); this.FixupRead(); this.SLO(); break; // *SLO (absolute, X)
case 0x22: this.SwallowRead(); this.JAM(); break; // *JAM
case 0x22: this.SwallowRead(); this.JAM(); break; // *JAM
case 0x23: this.IndexedIndirectX(); this.RLA(); break; // *RLA (indexed indirect X)
case 0x27: this.ZeroPage(); this.RLA(); break; // *RLA (zero page)
case 0x2b: this.FetchByte(); this.ANC(); break; // *ANC (immediate)
case 0x2f: this.Absolute(); this.RLA(); break; // *RLA (absolute)
case 0x32: this.SwallowRead(); this.JAM(); break; // *JAM
case 0x32: this.SwallowRead(); this.JAM(); break; // *JAM
case 0x33: this.IndirectIndexedYAddress(); this.FixupRead(); this.RLA(); break; // *RLA (indirect indexed Y)
case 0x34: this.ZeroPageX(); NOP(); break; // *NOP (zero page, X)
case 0x37: this.ZeroPageX(); this.RLA(); break; // *RLA (zero page, X)
@@ -52,23 +52,23 @@ namespace M6502
case 0x3c: this.AbsoluteXAddress(); this.MaybeFixupRead(); NOP(); break; // *NOP (absolute, X)
case 0x3f: this.AbsoluteXAddress(); this.FixupRead(); this.RLA(); break; // *RLA (absolute, X)
case 0x42: this.SwallowRead(); this.JAM(); break; // *JAM
case 0x42: this.SwallowRead(); this.JAM(); break; // *JAM
case 0x43: this.IndexedIndirectX(); this.SRE(); break; // *SRE (indexed indirect X)
case 0x47: this.ZeroPage(); this.SRE(); break; // *SRE (zero page)
case 0x4b: this.FetchByte(); this.ASR(); break; // *ASR (immediate)
case 0x4f: this.Absolute(); this.SRE(); break; // *SRE (absolute)
case 0x52: this.SwallowRead(); this.JAM(); break; // *JAM
case 0x52: this.SwallowRead(); this.JAM(); break; // *JAM
case 0x53: this.IndirectIndexedYAddress(); this.FixupRead(); this.SRE(); break; // *SRE (indirect indexed Y)
case 0x57: this.ZeroPageX(); this.SRE(); break; // *SRE (zero page, X)
case 0x5a: this.SwallowRead(); break; // *NOP (implied)
case 0x5a: this.SwallowRead(); NOP(); break; // *NOP (implied)
case 0x5b: this.AbsoluteYAddress(); this.FixupRead(); this.SRE(); break; // *SRE (absolute, Y)
case 0x5c: this.AbsoluteXAddress(); this.MaybeFixupRead(); break; // *NOP (absolute, X)
case 0x5c: this.AbsoluteXAddress(); this.MaybeFixupRead(); NOP(); break; // *NOP (absolute, X)
case 0x5f: this.AbsoluteXAddress(); this.FixupRead(); this.SRE(); break; // *SRE (absolute, X)
case 0x62: this.SwallowRead(); this.JAM(); break; // *JAM
case 0x62: this.SwallowRead(); this.JAM(); break; // *JAM
case 0x63: this.IndexedIndirectX(); this.RRA(); break; // *RRA (indexed indirect X)
case 0x64: this.ZeroPage(); break; // *NOP (zero page)
case 0x64: this.ZeroPage(); NOP(); break; // *NOP (zero page)
case 0x67: this.ZeroPage(); this.RRA(); break; // *RRA (zero page)
case 0x6b: this.FetchByte(); this.ARR(); break; // *ARR (immediate)
case 0x6f: this.Absolute(); this.RRA(); break; // *RRA (absolute)