202 lines
6.5 KiB
C#
202 lines
6.5 KiB
C#
using System;
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using BizHawk.Common;
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/**
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This is the cartridge class for Arcadia (aka Starpath) Supercharger
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games. Christopher Salomon provided most of the technical details
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used in creating this class. A good description of the Supercharger
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is provided in the Cuttle Cart's manual.
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The Supercharger has four 2K banks. There are three banks of RAM
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and one bank of ROM. All 6K of the RAM can be read and written.
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D7-D5 of this byte: Write Pulse Delay (n/a for emulator)
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D4-D0: RAM/ROM configuration:
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$F000-F7FF $F800-FFFF Address range that banks map into
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000wp 2 ROM
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001wp 0 ROM
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010wp 2 0 as used in Commie Mutants and many others
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011wp 0 2 as used in Suicide Mission
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100wp 2 ROM
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101wp 1 ROM
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110wp 2 1 as used in Killer Satellites
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111wp 1 2 as we use for 2k/4k ROM cloning
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w = Write Enable (1 = enabled; accesses to $F000-$F0FF cause writes
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to happen. 0 = disabled, and the cart acts like ROM.)
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p = ROM Power (0 = enabled, 1 = off.) Only power the ROM if you're
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wanting to access the ROM for multiloads. Otherwise set to 1.
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*/
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namespace BizHawk.Emulation.Cores.Atari.Atari2600
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{
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internal class mAR : MapperBase
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{
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public mAR()
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{
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throw new NotImplementedException();
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}
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private int _bank2k;
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private ByteBuffer _ram = new ByteBuffer(6144);
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private IntBuffer _offsets = new IntBuffer(2);
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private bool _writePending = false;
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private readonly byte[] _RomCode = {
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0xa5, 0xfa, 0x85, 0x80, 0x4c, 0x18, 0xf8, 0xff,
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0xff, 0xff, 0x78, 0xd8, 0xa0, 0x00, 0xa2, 0x00,
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0x94, 0x00, 0xe8, 0xd0, 0xfb, 0x4c, 0x50, 0xf8,
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0xa2, 0x00, 0xbd, 0x06, 0xf0, 0xad, 0xf8, 0xff,
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0xa2, 0x00, 0xad, 0x00, 0xf0, 0xea, 0xbd, 0x00,
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0xf7, 0xca, 0xd0, 0xf6, 0x4c, 0x50, 0xf8, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xa2, 0x03, 0xbc, 0x22, 0xf9, 0x94, 0xfa, 0xca,
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0x10, 0xf8, 0xa0, 0x00, 0xa2, 0x28, 0x94, 0x04,
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0xca, 0x10, 0xfb, 0xa2, 0x1c, 0x94, 0x81, 0xca,
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0x10, 0xfb, 0xa9, 0xff, 0xc9, 0x00, 0xd0, 0x03,
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0x4c, 0x13, 0xf9, 0xa9, 0x00, 0x85, 0x1b, 0x85,
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0x1c, 0x85, 0x1d, 0x85, 0x1e, 0x85, 0x1f, 0x85,
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0x19, 0x85, 0x1a, 0x85, 0x08, 0x85, 0x01, 0xa9,
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0x10, 0x85, 0x21, 0x85, 0x02, 0xa2, 0x07, 0xca,
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0xca, 0xd0, 0xfd, 0xa9, 0x00, 0x85, 0x20, 0x85,
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0x10, 0x85, 0x11, 0x85, 0x02, 0x85, 0x2a, 0xa9,
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0x05, 0x85, 0x0a, 0xa9, 0xff, 0x85, 0x0d, 0x85,
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0x0e, 0x85, 0x0f, 0x85, 0x84, 0x85, 0x85, 0xa9,
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0xf0, 0x85, 0x83, 0xa9, 0x74, 0x85, 0x09, 0xa9,
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0x0c, 0x85, 0x15, 0xa9, 0x1f, 0x85, 0x17, 0x85,
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0x82, 0xa9, 0x07, 0x85, 0x19, 0xa2, 0x08, 0xa0,
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0x00, 0x85, 0x02, 0x88, 0xd0, 0xfb, 0x85, 0x02,
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0x85, 0x02, 0xa9, 0x02, 0x85, 0x02, 0x85, 0x00,
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0x85, 0x02, 0x85, 0x02, 0x85, 0x02, 0xa9, 0x00,
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0x85, 0x00, 0xca, 0x10, 0xe4, 0x06, 0x83, 0x66,
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0x84, 0x26, 0x85, 0xa5, 0x83, 0x85, 0x0d, 0xa5,
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0x84, 0x85, 0x0e, 0xa5, 0x85, 0x85, 0x0f, 0xa6,
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0x82, 0xca, 0x86, 0x82, 0x86, 0x17, 0xe0, 0x0a,
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0xd0, 0xc3, 0xa9, 0x02, 0x85, 0x01, 0xa2, 0x1c,
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0xa0, 0x00, 0x84, 0x19, 0x84, 0x09, 0x94, 0x81,
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0xca, 0x10, 0xfb, 0xa6, 0x80, 0xdd, 0x00, 0xf0,
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0xa9, 0x9a, 0xa2, 0xff, 0xa0, 0x00, 0x9a, 0x4c,
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0xfa, 0x00, 0xcd, 0xf8, 0xff, 0x4c
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};
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private readonly byte[] RomHeader = {
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0xac, 0xfa, 0x0f, 0x18, 0x62, 0x00, 0x24, 0x02,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0x00, 0x04, 0x08, 0x0c, 0x10, 0x14, 0x18, 0x1c,
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0x01, 0x05, 0x09, 0x0d, 0x11, 0x15, 0x19, 0x1d,
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0x02, 0x06, 0x0a, 0x0e, 0x12, 0x16, 0x1a, 0x1e,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00
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};
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public override bool HasCartRam
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{
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get { return true; }
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}
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public override ByteBuffer CartRam
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{
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get { return _ram; }
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}
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public override void SyncState(Serializer ser)
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{
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base.SyncState(ser);
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ser.Sync("bank4k", ref _bank2k);
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ser.Sync("ram", ref _ram);
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}
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public override void HardReset()
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{
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_bank2k = 0;
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_ram = new ByteBuffer(6144);
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base.HardReset();
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}
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public override void Dispose()
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{
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base.Dispose();
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_ram.Dispose();
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}
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private byte ReadMem(ushort addr, bool peek)
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{
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if (!peek)
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{
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Address(addr);
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}
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if (addr < 0x1000)
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{
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return base.ReadMemory(addr);
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}
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if (addr == 0x1850 && _offsets[1] == (3 << 11))
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{
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/// TODO: weird stuff goes here
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///
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return Core.Rom[(addr & 0x7FF) + _offsets[1]];
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}
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// TODO: cancel pending writes
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if (addr == 0x1FF8)
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{
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_writePending = false;
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}
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return Core.Rom[(_bank2k << 12) + (addr & 0xFFF)];
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}
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public override byte ReadMemory(ushort addr)
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{
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return ReadMem(addr, false);
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}
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public override byte PeekMemory(ushort addr)
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{
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return ReadMem(addr, true);
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}
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private void Address(ushort addr)
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{
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if (addr == 0x1FF8)
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{
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_bank2k = 0;
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}
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else if (addr == 0x1FF9)
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{
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_bank2k = 1;
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}
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}
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}
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}
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