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Delete CartPB8K.cs

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alyosha-tas 2017-08-29 09:32:35 -04:00 committed by GitHub
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commit 2706d2ab39
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EMU7800/Core/CartPB8K.cs
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namespace EMU7800.Core
{
/// <summary>
/// Parker Brothers 8KB bankswitched carts.
/// </summary>
public sealed class CartPB8K : Cart
{
//
// Cart Format Mapping to ROM Address Space
// Segment1: 0x0000:0x0400 Bank1:0x1000:0x0400 Select Segment: 1fe0-1fe7
// Segment2: 0x0400:0x0400 Bank2:0x1400:0x0400 Select Segment: 1fe8-1ff0
// Segment3: 0x0800:0x0400 Bank3:0x1800:0x0400 Select Segment: 1ff0-1ff8
// Segment4: 0x0c00:0x0400 Bank4:0x1c00:0x0400 Always Segment8
// Segment5: 0x1000:0x0400
// Segment6: 0x1400:0x0400
// Segment7: 0x1800:0x0400
// Segment8: 0x1c00:0x0400
//
readonly ushort[] SegmentBase;
#region IDevice Members
public override void Reset()
{
SegmentBase[0] = ComputeSegmentBase(4);
SegmentBase[1] = ComputeSegmentBase(5);
SegmentBase[2] = ComputeSegmentBase(6);
}
public override byte this[ushort addr]
{
get
{
addr &= 0x0fff;
UpdateSegmentBases(addr);
return ROM[SegmentBase[addr >> 10] + (addr & 0x03ff)];
}
set
{
addr &= 0x0fff;
UpdateSegmentBases(addr);
}
}
#endregion
private CartPB8K()
{
}
public CartPB8K(byte[] romBytes)
{
LoadRom(romBytes, 0x2000);
SegmentBase = new ushort[4];
SegmentBase[0] = ComputeSegmentBase(4);
SegmentBase[1] = ComputeSegmentBase(5);
SegmentBase[2] = ComputeSegmentBase(6);
SegmentBase[3] = ComputeSegmentBase(7);
}
static ushort ComputeSegmentBase(int slice)
{
return (ushort)(slice << 10); // multiply by 1024
}
void UpdateSegmentBases(ushort addr)
{
if (addr < 0xfe0 || addr >= 0x0ff8) { }
else if (addr >= 0x0fe0 && addr < 0x0fe8)
{
SegmentBase[0] = ComputeSegmentBase(addr & 0x07);
}
else if (addr >= 0x0fe8 && addr < 0x0ff0)
{
SegmentBase[1] = ComputeSegmentBase(addr & 0x07);
}
else if (addr >= 0x0ff0 && addr < 0x0ff8)
{
SegmentBase[2] = ComputeSegmentBase(addr & 0x07);
}
}
#region Serialization Members
public CartPB8K(DeserializationContext input, MachineBase m) : base(input)
{
input.CheckVersion(1);
LoadRom(input.ReadExpectedBytes(0x2000), 0x2000);
SegmentBase = input.ReadUnsignedShorts();
}
public override void GetObjectData(SerializationContext output)
{
base.GetObjectData(output);
output.WriteVersion(1);
output.Write(ROM);
output.Write(SegmentBase);
}
#endregion
}
}