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Atari 2600 - some ground work for the AR mapper, doesn't yet do anything

This commit is contained in:
adelikat 2014-04-12 17:52:49 +00:00
parent ccae8ce914
commit 3f3f607e60
1 changed files with 118 additions and 8 deletions
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126
BizHawk.Emulation.Cores/Consoles/Atari/2600/Mappers/mAR.cs
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@ -8,19 +8,114 @@ using BizHawk.Common;
The Supercharger has four 2K banks. There are three banks of RAM
and one bank of ROM. All 6K of the RAM can be read and written.
D7-D5 of this byte: Write Pulse Delay (n/a for emulator)
D4-D0: RAM/ROM configuration:
$F000-F7FF $F800-FFFF Address range that banks map into
000wp 2 ROM
001wp 0 ROM
010wp 2 0 as used in Commie Mutants and many others
011wp 0 2 as used in Suicide Mission
100wp 2 ROM
101wp 1 ROM
110wp 2 1 as used in Killer Satellites
111wp 1 2 as we use for 2k/4k ROM cloning
w = Write Enable (1 = enabled; accesses to $F000-$F0FF cause writes
to happen. 0 = disabled, and the cart acts like ROM.)
p = ROM Power (0 = enabled, 1 = off.) Only power the ROM if you're
wanting to access the ROM for multiloads. Otherwise set to 1.
*/
namespace BizHawk.Emulation.Cores.Atari.Atari2600
{
internal class mAR : MapperBase
{
private int _bank4k;
private ByteBuffer _ram = new ByteBuffer(6144);
public mAR()
{
throw new NotImplementedException();
}
private int _bank2k;
private ByteBuffer _ram = new ByteBuffer(6144);
private IntBuffer _offsets = new IntBuffer(2);
private bool _writePending = false;
private readonly byte[] _RomCode = {
0xa5, 0xfa, 0x85, 0x80, 0x4c, 0x18, 0xf8, 0xff,
0xff, 0xff, 0x78, 0xd8, 0xa0, 0x00, 0xa2, 0x00,
0x94, 0x00, 0xe8, 0xd0, 0xfb, 0x4c, 0x50, 0xf8,
0xa2, 0x00, 0xbd, 0x06, 0xf0, 0xad, 0xf8, 0xff,
0xa2, 0x00, 0xad, 0x00, 0xf0, 0xea, 0xbd, 0x00,
0xf7, 0xca, 0xd0, 0xf6, 0x4c, 0x50, 0xf8, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xa2, 0x03, 0xbc, 0x22, 0xf9, 0x94, 0xfa, 0xca,
0x10, 0xf8, 0xa0, 0x00, 0xa2, 0x28, 0x94, 0x04,
0xca, 0x10, 0xfb, 0xa2, 0x1c, 0x94, 0x81, 0xca,
0x10, 0xfb, 0xa9, 0xff, 0xc9, 0x00, 0xd0, 0x03,
0x4c, 0x13, 0xf9, 0xa9, 0x00, 0x85, 0x1b, 0x85,
0x1c, 0x85, 0x1d, 0x85, 0x1e, 0x85, 0x1f, 0x85,
0x19, 0x85, 0x1a, 0x85, 0x08, 0x85, 0x01, 0xa9,
0x10, 0x85, 0x21, 0x85, 0x02, 0xa2, 0x07, 0xca,
0xca, 0xd0, 0xfd, 0xa9, 0x00, 0x85, 0x20, 0x85,
0x10, 0x85, 0x11, 0x85, 0x02, 0x85, 0x2a, 0xa9,
0x05, 0x85, 0x0a, 0xa9, 0xff, 0x85, 0x0d, 0x85,
0x0e, 0x85, 0x0f, 0x85, 0x84, 0x85, 0x85, 0xa9,
0xf0, 0x85, 0x83, 0xa9, 0x74, 0x85, 0x09, 0xa9,
0x0c, 0x85, 0x15, 0xa9, 0x1f, 0x85, 0x17, 0x85,
0x82, 0xa9, 0x07, 0x85, 0x19, 0xa2, 0x08, 0xa0,
0x00, 0x85, 0x02, 0x88, 0xd0, 0xfb, 0x85, 0x02,
0x85, 0x02, 0xa9, 0x02, 0x85, 0x02, 0x85, 0x00,
0x85, 0x02, 0x85, 0x02, 0x85, 0x02, 0xa9, 0x00,
0x85, 0x00, 0xca, 0x10, 0xe4, 0x06, 0x83, 0x66,
0x84, 0x26, 0x85, 0xa5, 0x83, 0x85, 0x0d, 0xa5,
0x84, 0x85, 0x0e, 0xa5, 0x85, 0x85, 0x0f, 0xa6,
0x82, 0xca, 0x86, 0x82, 0x86, 0x17, 0xe0, 0x0a,
0xd0, 0xc3, 0xa9, 0x02, 0x85, 0x01, 0xa2, 0x1c,
0xa0, 0x00, 0x84, 0x19, 0x84, 0x09, 0x94, 0x81,
0xca, 0x10, 0xfb, 0xa6, 0x80, 0xdd, 0x00, 0xf0,
0xa9, 0x9a, 0xa2, 0xff, 0xa0, 0x00, 0x9a, 0x4c,
0xfa, 0x00, 0xcd, 0xf8, 0xff, 0x4c
};
private readonly byte[] RomHeader = {
0xac, 0xfa, 0x0f, 0x18, 0x62, 0x00, 0x24, 0x02,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0x00, 0x04, 0x08, 0x0c, 0x10, 0x14, 0x18, 0x1c,
0x01, 0x05, 0x09, 0x0d, 0x11, 0x15, 0x19, 0x1d,
0x02, 0x06, 0x0a, 0x0e, 0x12, 0x16, 0x1a, 0x1e,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00
};
public override bool HasCartRam
{
get { return true; }
@ -34,13 +129,13 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
public override void SyncState(Serializer ser)
{
base.SyncState(ser);
ser.Sync("bank4k", ref _bank4k);
ser.Sync("bank4k", ref _bank2k);
ser.Sync("ram", ref _ram);
}
public override void HardReset()
{
_bank4k = 0;
_bank2k = 0;
_ram = new ByteBuffer(6144);
base.HardReset();
}
@ -63,7 +158,22 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
return base.ReadMemory(addr);
}
return Core.Rom[(_bank4k << 12) + (addr & 0xFFF)];
if (addr == 0x1850 && _offsets[1] == (3 << 11))
{
/// TODO: weird stuff goes here
///
return Core.Rom[(addr & 0x7FF) + _offsets[1]];
}
// TODO: cancel pending writes
if (addr == 0x1FF8)
{
_writePending = false;
}
return Core.Rom[(_bank2k << 12) + (addr & 0xFFF)];
}
public override byte ReadMemory(ushort addr)
@ -80,11 +190,11 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
{
if (addr == 0x1FF8)
{
_bank4k = 0;
_bank2k = 0;
}
else if (addr == 0x1FF9)
{
_bank4k = 1;
_bank2k = 1;
}
}
}