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Sort out: power, initialisation and relative branch offset calculation issues arising.

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Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
This commit is contained in:
Adrian Conlon 2019-02-03 09:32:59 +00:00
parent 3c5e292eae
commit d58b635626
1 changed files with 25 additions and 13 deletions
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38
M6502/M6502.cs
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@ -8,22 +8,22 @@
private const byte RSTvector = 0xfc; // RST vector
private const byte NMIvector = 0xfa; // NMI vector
private byte x;
private byte y;
private byte a;
private byte s;
private byte p;
private byte x = 0;
private byte y = 0;
private byte a = 0;
private byte s = 0;
private byte p = 0;
private ushort intermediate;
private bool handlingRESET;
private bool handlingNMI;
private bool handlingINT;
private bool handlingRESET = false;
private bool handlingNMI = false;
private bool handlingINT = false;
private PinLevel nmiLine;
private PinLevel soLine;
private PinLevel syncLine;
private PinLevel rdyLine;
private PinLevel nmiLine = PinLevel.Low;
private PinLevel soLine = PinLevel.Low;
private PinLevel syncLine = PinLevel.Low;
private PinLevel rdyLine = PinLevel.Low;
public M6502(Bus bus)
: base(bus)
@ -71,6 +71,17 @@
public ref PinLevel SYNC() => ref syncLine;
public ref PinLevel RDY() => ref rdyLine;
public override void RaisePOWER()
{
base.RaisePOWER();
X = (byte)Bits.Bit7;
Y = 0;
A = 0;
P = (byte)StatusBits.RF;
S = (byte)Mask.Mask8;
LowerSYNC();
}
public virtual void RaiseNMI()
{
OnRaisingNMI();
@ -579,7 +590,8 @@
private ushort Address_relative_byte()
{
intermediate = (ushort)(PC + (byte)FetchByte());
var offset = (sbyte)FetchByte();
intermediate = (ushort)(PC + offset);
return intermediate;
}