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GBHawk: HuC1 support

This commit is contained in:
alyosha-tas 2018-10-14 09:45:13 -05:00
parent 4dd55ad0ff
commit 41d1db14ef
1 changed files with 98 additions and 10 deletions
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108
BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/Mappers/Mapper_HuC1.cs
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@ -4,31 +4,75 @@ using System;
namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
{
// Default mapper with no bank switching
// hudson mapper used in ex Daikaijuu monogatari
public class MapperHuC1 : MapperBase
{
public int ROM_bank;
public int RAM_bank;
public bool RAM_enable;
public int ROM_mask;
public int RAM_mask;
public bool IR_signal;
public override void Initialize()
{
// nothing to initialize
ROM_bank = 0;
RAM_bank = 0;
RAM_enable = false;
ROM_mask = Core._rom.Length / 0x4000 - 1;
// some games have sizes that result in a degenerate ROM, account for it here
if (ROM_mask > 4) { ROM_mask |= 3; }
RAM_mask = 0;
if (Core.cart_RAM != null)
{
RAM_mask = Core.cart_RAM.Length / 0x2000 - 1;
if (Core.cart_RAM.Length == 0x800) { RAM_mask = 0; }
}
}
public override byte ReadMemory(ushort addr)
{
if (addr < 0x8000)
if (addr < 0x4000)
{
return Core._rom[addr];
}
else
else if (addr < 0x8000)
{
if (Core.cart_RAM != null)
return Core._rom[(addr - 0x4000) + ROM_bank * 0x4000];
}
else if ((addr >= 0xA000) && (addr < 0xC000))
{
if (RAM_enable)
{
return Core.cart_RAM[addr - 0xA000];
if (Core.cart_RAM != null)
{
if (((addr - 0xA000) + RAM_bank * 0x2000) < Core.cart_RAM.Length)
{
return Core.cart_RAM[(addr - 0xA000) + RAM_bank * 0x2000];
}
else
{
return 0xFF;
}
}
else
{
return 0xFF;
}
}
else
{
return 0;
// when RAM isn't enabled, reading from this area will return IR sensor reading
// for now we'll assume it never sees light (0xC0)
return 0xC0;
}
}
else
{
return 0xFF;
}
}
public override byte PeekMemory(ushort addr)
@ -40,13 +84,47 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
{
if (addr < 0x8000)
{
// no mapping hardware available
if (addr < 0x2000)
{
RAM_enable = (value & 0xF) != 0xE;
}
else if (addr < 0x4000)
{
value &= 0x3F;
ROM_bank &= 0xC0;
ROM_bank |= value;
ROM_bank &= ROM_mask;
}
else if (addr < 0x6000)
{
RAM_bank = value & 3;
RAM_bank &= RAM_mask;
}
}
else
{
if (Core.cart_RAM != null)
if (RAM_enable)
{
Core.cart_RAM[addr - 0xA000] = value;
if (Core.cart_RAM != null)
{
if (((addr - 0xA000) + RAM_bank * 0x2000) < Core.cart_RAM.Length)
{
Core.cart_RAM[(addr - 0xA000) + RAM_bank * 0x2000] = value;
}
}
}
else
{
// I don't know if other bits here have an effect
if (value == 1)
{
IR_signal = true;
}
else if (value == 0)
{
IR_signal = false;
}
}
}
}
@ -55,5 +133,15 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
{
WriteMemory(addr, value);
}
public override void SyncState(Serializer ser)
{
ser.Sync("ROM_Bank", ref ROM_bank);
ser.Sync("ROM_Mask", ref ROM_mask);
ser.Sync("RAM_Bank", ref RAM_bank);
ser.Sync("RAM_Mask", ref RAM_mask);
ser.Sync("RAM_enable", ref RAM_enable);
ser.Sync("IR_signal", ref IR_signal);
}
}
}