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Implement WAI and STP

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This commit is contained in:
Adrian Conlon 2024-07-26 12:13:50 +01:00
parent a4e7e1c499
commit b4c2d5fcff
1 changed files with 40 additions and 2 deletions
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42
M6502/W65C02.cs
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@ -9,6 +9,18 @@ namespace EightBit
private bool _stopped = false;
private bool _waiting = false;
private bool Stopped
{
get => this._stopped; set => this._stopped = value;
}
private bool Waiting
{
get => this._waiting; set => this._waiting = value;
}
private bool Paused => this.Stopped || this.Waiting;
#region Interrupts
protected override void Interrupt(byte vector, InterruptSource source, InterruptType type)
@ -121,14 +133,14 @@ namespace EightBit
case 0xc3: break; // null
case 0xc7: break; // SMB4 zp
case 0xcb: this.SwallowRead(); this._waiting = true; break; // WAI i
case 0xcb: this.SwallowRead(); this.Waiting = true; break; // WAI i
case 0xcf: break; // BBS4 r
case 0xd2: this.ZeroPageIndirectRead(); this.CMP(this.A); break; // CMP (zp)
case 0xd3: break; // null
case 0xd7: break; // SMB5 zp
case 0xda: this.SwallowRead(); this.Push(this.X); break; // PHX s
case 0xdb: this.SwallowRead(); this._stopped = true; break; // STP i
case 0xdb: this.SwallowRead(); this.Stopped = true; break; // STP i
case 0xdc: break; // null
case 0xdf: break; // BBS5 r
@ -149,6 +161,32 @@ namespace EightBit
return cycles != this.Cycles;
}
public override void PoweredStep()
{
if (!this.Paused)
{
base.PoweredStep();
}
}
protected override void OnLoweredRESET()
{
base.OnLoweredRESET();
this.Stopped = this.Waiting = false;
}
protected override void OnLoweredINT()
{
base.OnLoweredINT();
this.Waiting = false;
}
protected override void OnLoweredNMI()
{
base.OnLoweredNMI();
this.Waiting = false;
}
#endregion
#region Bus/Memory Access