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C64: Manage memory for Cartridge, Write protect on media.

This commit is contained in:
Anthony Konzel 2016-03-04 16:15:01 -06:00
parent f4f45f73a8
commit b0e4e18ebc
3 changed files with 89 additions and 82 deletions
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164
BizHawk.Emulation.Cores/Computers/Commodore64/Cartridge/CartridgeDevice.cs
View File

@ -10,98 +10,100 @@ namespace BizHawk.Emulation.Cores.Computers.Commodore64.Cartridge
{
public static CartridgeDevice Load(byte[] crtFile)
{
var mem = new MemoryStream(crtFile);
var reader = new BinaryReader(mem);
if (new string(reader.ReadChars(16)) != "C64 CARTRIDGE ")
using (var mem = new MemoryStream(crtFile))
{
return null;
}
var reader = new BinaryReader(mem);
var chipAddress = new List<int>();
var chipBank = new List<int>();
var chipData = new List<int[]>();
var chipType = new List<int>();
if (new string(reader.ReadChars(16)) != "C64 CARTRIDGE ")
{
return null;
}
var headerLength = ReadCRTInt(reader);
var version = ReadCRTShort(reader);
var mapper = ReadCRTShort(reader);
var exrom = reader.ReadByte() != 0;
var game = reader.ReadByte() != 0;
var chipAddress = new List<int>();
var chipBank = new List<int>();
var chipData = new List<int[]>();
var chipType = new List<int>();
// reserved
reader.ReadBytes(6);
var headerLength = ReadCRTInt(reader);
var version = ReadCRTShort(reader);
var mapper = ReadCRTShort(reader);
var exrom = reader.ReadByte() != 0;
var game = reader.ReadByte() != 0;
// cartridge name
reader.ReadBytes(0x20);
// reserved
reader.ReadBytes(6);
// skip extra header bytes
if (headerLength > 0x40)
{
reader.ReadBytes(headerLength - 0x40);
}
// cartridge name
reader.ReadBytes(0x20);
// read chips
while (reader.PeekChar() >= 0)
{
if (new string(reader.ReadChars(4)) != "CHIP")
{
break;
}
// skip extra header bytes
if (headerLength > 0x40)
{
reader.ReadBytes(headerLength - 0x40);
}
var chipLength = ReadCRTInt(reader);
chipType.Add(ReadCRTShort(reader));
chipBank.Add(ReadCRTShort(reader));
chipAddress.Add(ReadCRTShort(reader));
var chipDataLength = ReadCRTShort(reader);
chipData.Add(reader.ReadBytes(chipDataLength).Select(x => (int)x).ToArray());
chipLength -= chipDataLength + 0x10;
if (chipLength > 0)
reader.ReadBytes(chipLength);
}
// read chips
while (reader.PeekChar() >= 0)
{
if (new string(reader.ReadChars(4)) != "CHIP")
{
break;
}
if (chipData.Count <= 0)
{
return null;
}
var chipLength = ReadCRTInt(reader);
chipType.Add(ReadCRTShort(reader));
chipBank.Add(ReadCRTShort(reader));
chipAddress.Add(ReadCRTShort(reader));
var chipDataLength = ReadCRTShort(reader);
chipData.Add(reader.ReadBytes(chipDataLength).Select(x => (int)x).ToArray());
chipLength -= chipDataLength + 0x10;
if (chipLength > 0)
reader.ReadBytes(chipLength);
}
CartridgeDevice result;
switch (mapper)
{
case 0x0000:
result = new Mapper0000(chipAddress, chipData, game, exrom);
break;
case 0x0005:
result = new Mapper0005(chipAddress, chipBank, chipData);
break;
case 0x000A:
result = new Mapper000A(chipAddress, chipBank, chipData);
break;
case 0x000B:
result = new Mapper000B(chipAddress, chipData);
break;
case 0x000F:
result = new Mapper000F(chipAddress, chipBank, chipData);
break;
case 0x0011:
result = new Mapper0011(chipAddress, chipBank, chipData);
break;
case 0x0012:
result = new Mapper0012(chipAddress, chipBank, chipData);
break;
case 0x0013:
result = new Mapper0013(chipAddress, chipBank, chipData);
break;
case 0x0020:
result = new Mapper0020(chipAddress, chipBank, chipData);
break;
default:
throw new Exception("This cartridge file uses an unrecognized mapper: " + mapper);
}
result.HardReset();
if (chipData.Count <= 0)
{
return null;
}
return result;
}
CartridgeDevice result;
switch (mapper)
{
case 0x0000:
result = new Mapper0000(chipAddress, chipData, game, exrom);
break;
case 0x0005:
result = new Mapper0005(chipAddress, chipBank, chipData);
break;
case 0x000A:
result = new Mapper000A(chipAddress, chipBank, chipData);
break;
case 0x000B:
result = new Mapper000B(chipAddress, chipData);
break;
case 0x000F:
result = new Mapper000F(chipAddress, chipBank, chipData);
break;
case 0x0011:
result = new Mapper0011(chipAddress, chipBank, chipData);
break;
case 0x0012:
result = new Mapper0012(chipAddress, chipBank, chipData);
break;
case 0x0013:
result = new Mapper0013(chipAddress, chipBank, chipData);
break;
case 0x0020:
result = new Mapper0020(chipAddress, chipBank, chipData);
break;
default:
throw new Exception("This cartridge file uses an unrecognized mapper: " + mapper);
}
result.HardReset();
return result;
}
}
private static int ReadCRTShort(BinaryReader reader)
{

5
BizHawk.Emulation.Cores/Computers/Commodore64/Media/Disk.cs
View File

@ -13,12 +13,14 @@ namespace BizHawk.Emulation.Cores.Computers.Commodore64.Media
[SaveState.DoNotSave] private int[][] _tracks;
[SaveState.DoNotSave] private readonly int[] _originalMedia;
[SaveState.DoNotSave] public bool Valid;
[SaveState.SaveWithName("DiskIsWriteProtected")] public bool WriteProtected;
/// <summary>
/// Create a blank, unformatted disk.
/// </summary>
public Disk(int trackCapacity)
{
{
WriteProtected = false;
_tracks = new int[trackCapacity][];
FillMissingTracks();
_originalMedia = SerializeTracks(_tracks);
@ -35,6 +37,7 @@ namespace BizHawk.Emulation.Cores.Computers.Commodore64.Media
/// <param name="trackCapacity">Total number of tracks on the media.</param>
public Disk(IList<byte[]> trackData, IList<int> trackNumbers, IList<int> trackDensities, IList<int> trackLengths, int trackCapacity)
{
WriteProtected = true;
_tracks = new int[trackCapacity][];
for (var i = 0; i < trackData.Count; i++)
{

2
BizHawk.Emulation.Cores/Computers/Commodore64/Serial/Drive1541.cs
View File

@ -177,6 +177,8 @@ namespace BizHawk.Emulation.Cores.Computers.Commodore64.Serial
public void RemoveMedia()
{
_disk = null;
_trackImageData = null;
_diskBits = 0;
}
}
}