61 lines
1.6 KiB
C#
61 lines
1.6 KiB
C#
using System;
|
|
using System.Collections.Generic;
|
|
using System.Linq;
|
|
using System.Text;
|
|
|
|
namespace BizHawk.Emulation.Consoles.Atari._2600
|
|
{
|
|
/*
|
|
EF (no name?)
|
|
-----
|
|
|
|
This is a fairly simple method that allows for up to 64K of ROM, using 16 4K banks.
|
|
It works similar to F8, F6, etc. Only the addresses to perform the switch is
|
|
1FE0-1FEF. Accessing one of these will select the desired bank. 1FE0 = bank 0,
|
|
1FE1 = bank 1, etc.
|
|
*/
|
|
|
|
class mEF : MapperBase
|
|
{
|
|
int toggle = 0;
|
|
|
|
public override byte ReadMemory(ushort addr)
|
|
{
|
|
Address(addr);
|
|
if (addr < 0x1000) return base.ReadMemory(addr);
|
|
return core.rom[toggle * 4 * 1024 + (addr & 0xFFF)];
|
|
}
|
|
public override void WriteMemory(ushort addr, byte value)
|
|
{
|
|
Address(addr);
|
|
if (addr < 0x1000) base.WriteMemory(addr, value);
|
|
}
|
|
|
|
public override void SyncState(Serializer ser)
|
|
{
|
|
base.SyncState(ser);
|
|
ser.Sync("toggle", ref toggle);
|
|
}
|
|
|
|
void Address(ushort addr)
|
|
{
|
|
if (addr == 0x1FE0) toggle = 0;
|
|
if (addr == 0x1FE1) toggle = 1;
|
|
if (addr == 0x1FE2) toggle = 2;
|
|
if (addr == 0x1FE3) toggle = 3;
|
|
if (addr == 0x1FE4) toggle = 4;
|
|
if (addr == 0x1FE5) toggle = 5;
|
|
if (addr == 0x1FE6) toggle = 6;
|
|
if (addr == 0x1FE7) toggle = 7;
|
|
if (addr == 0x1FE8) toggle = 8;
|
|
if (addr == 0x1FE9) toggle = 9;
|
|
if (addr == 0x1FEA) toggle = 10;
|
|
if (addr == 0x1FEB) toggle = 11;
|
|
if (addr == 0x1FEC) toggle = 12;
|
|
if (addr == 0x1FED) toggle = 13;
|
|
if (addr == 0x1FEE) toggle = 14;
|
|
if (addr == 0x1FEF) toggle = 15;
|
|
}
|
|
}
|
|
}
|