134 lines
2.8 KiB
C#
134 lines
2.8 KiB
C#
using BizHawk.Common;
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using BizHawk.Common.NumberExtensions;
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using System;
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namespace BizHawk.Emulation.Cores.Atari.A7800Hawk
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{
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// Mapper only used by Rampage and Double Dragon
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public class MapperRampage : MapperBase
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{
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public byte bank = 0;
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public override byte ReadMemory(ushort addr)
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{
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if (addr >= 0x1000 && addr < 0x1800)
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{
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//could be hsbios RAM here
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if (Core._hsbios != null)
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{
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return Core._hsram[addr - 0x1000];
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}
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return 0xFF;
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}
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else if (addr < 0x4000)
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{
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// could be either RAM mirror or ROM
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if (addr >= 0x3000 && Core._hsbios != null)
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{
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return Core._hsbios[addr - 0x3000];
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}
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else
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{
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return Core.RAM[0x800 + addr & 0x7FF];
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}
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}
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else
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{
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// cartridge and other OPSYS
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if (addr >= (0x10000 - Core._bios.Length) && !Core.A7800_control_register.Bit(2))
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{
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return Core._bios[addr - (0x10000 - Core._bios.Length)];
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}
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else
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{
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/*
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$4000 -$5fff second 8kb of bank 6
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$6000 -$7fff first 8kb of bank 6
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$8000 -$9fff second 8kb of bank 7
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$e000 -$ffff first 8kb of bank 7
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$a000-$dfff Banked
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*/
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if (addr >= 0x4000 && addr < 0x6000)
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{
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int temp_addr = addr - 0x4000;
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return Core._rom[6 * 0x4000 + 0x2000 + temp_addr];
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}
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else if (addr >= 0x6000 && addr < 0x8000)
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{
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int temp_addr = addr - 0x6000;
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return Core._rom[6 * 0x4000 + temp_addr];
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}
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else if (addr >= 0x8000 && addr < 0xA000)
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{
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int temp_addr = addr - 0x8000;
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return Core._rom[7 * 0x4000 + 0x2000 + temp_addr];
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}
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else if (addr >= 0xA000 && addr < 0xE000)
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{
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int temp_addr = addr - 0xA000;
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return Core._rom[bank * 0x4000 + temp_addr];
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}
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else
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{
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int temp_addr = addr - 0xE000;
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return Core._rom[7 * 0x4000 + temp_addr];
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}
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}
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}
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}
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public override byte PeekMemory(ushort addr)
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{
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return ReadMemory(addr);
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}
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public override void WriteMemory(ushort addr, byte value)
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{
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if (addr >= 0x1000 && addr < 0x1800)
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{
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//could be hsbios RAM here
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if (Core._hsbios != null)
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{
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Core._hsram[addr - 0x1000] = value;
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}
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}
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else if (addr < 0x4000)
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{
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// could be either RAM mirror or ROM
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if (addr >= 0x3000 && Core._hsbios != null)
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{
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}
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else
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{
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Core.RAM[0x800 + addr & 0x7FF] = value;
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}
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}
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else
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{
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// cartridge and other OPSYS
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if (addr >= 0xFF80 && addr < 0xFF88) // might be other addresses, but only these are used
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{
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bank = (byte)(addr & 7);
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}
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}
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}
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public override void PokeMemory(ushort addr, byte value)
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{
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WriteMemory(addr, value);
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}
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public override void SyncState(Serializer ser)
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{
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ser.Sync("Bank", ref bank);
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}
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}
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}
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