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c64- VIC bank switching via CIA2

This commit is contained in:
saxxonpike 2012-11-03 16:15:16 +00:00
parent 5955976216
commit 8182da2fcd
1 changed files with 10 additions and 2 deletions
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12
BizHawk.Emulation/Computers/Commodore64/MemBus.cs
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@ -56,6 +56,8 @@ namespace BizHawk.Emulation.Computers.Commodore64
public MemoryLayout layout; public MemoryLayout layout;
// ram // ram
public byte cia2A;
public byte cia2B;
public byte[] colorRam; public byte[] colorRam;
public byte[] ram; public byte[] ram;
public ushort vicOffset; public ushort vicOffset;
@ -103,20 +105,26 @@ namespace BizHawk.Emulation.Computers.Commodore64
public byte CIA2ReadPortA() public byte CIA2ReadPortA()
{ {
return 0; return cia2A;
} }
public byte CIA2ReadPortB() public byte CIA2ReadPortB()
{ {
return 0; return cia2B;
} }
public void CIA2WritePortA(byte val, byte direction) public void CIA2WritePortA(byte val, byte direction)
{ {
cia2A &= (byte)~direction;
cia2A |= (byte)(val & direction);
vicOffset = (ushort)((cia2A & 0x03) << 14);
} }
public void CIA2WritePortB(byte val, byte direction) public void CIA2WritePortB(byte val, byte direction)
{ {
cia2B &= (byte)~direction;
cia2B |= (byte)(val & direction);
} }
public MemoryDesignation GetDesignation(ushort addr) public MemoryDesignation GetDesignation(ushort addr)