110 lines
2.4 KiB
C#
110 lines
2.4 KiB
C#
namespace MyNes.Core
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{
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[BoardInfo("Unknown", 163)]
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internal class Mapper163 : Board
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{
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internal byte prg_reg;
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internal byte security_reg;
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internal bool security_trigger;
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internal byte security_reg101;
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internal bool do_chr_ram;
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internal override void HardReset()
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{
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base.HardReset();
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security_reg101 = 1;
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security_trigger = false;
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do_chr_ram = true;
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Switch32KPRG(15, PRGArea.Area8000);
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Toggle08KCHR_RAM(ram: true);
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}
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internal override void WriteEX(ref ushort address, ref byte data)
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{
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if (address == 20737)
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{
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if (security_reg101 != 0 && data == 0)
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{
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security_trigger = true;
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}
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security_reg101 = data;
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}
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else
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{
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if (address < 20480)
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{
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return;
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}
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switch (address & 0x7300)
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{
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case 20480:
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prg_reg = (byte)((prg_reg & 0xF0u) | (data & 0xFu));
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Switch32KPRG(prg_reg, PRGArea.Area8000);
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do_chr_ram = (data & 0x80) != 0;
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if (!do_chr_ram && NesEmu.ppu_clock_v < 128)
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{
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Switch08KCHR(0);
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}
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break;
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case 20736:
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if (data == 6)
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{
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Switch32KPRG(3, PRGArea.Area8000);
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}
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break;
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case 20992:
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prg_reg = (byte)((prg_reg & 0xFu) | (uint)((data & 0xF) << 4));
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Switch32KPRG(prg_reg, PRGArea.Area8000);
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break;
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case 21248:
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security_reg = data;
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break;
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}
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}
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}
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internal override void ReadEX(ref ushort addr, out byte val)
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{
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val = 0;
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if (addr < 20480)
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{
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return;
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}
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switch (addr & 0x1E14)
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{
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case 20736:
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val = security_reg;
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break;
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case 21760:
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if (security_trigger)
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{
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val = security_reg;
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}
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break;
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}
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}
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internal override void OnPPUScanlineTick()
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{
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base.OnPPUScanlineTick();
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if (do_chr_ram && NesEmu.IsRenderingOn())
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{
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if (NesEmu.ppu_clock_v == 127)
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{
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Switch04KCHR(1, CHRArea.Area0000);
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Switch04KCHR(1, CHRArea.Area1000);
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}
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if (NesEmu.ppu_clock_v == 237)
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{
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Switch04KCHR(0, CHRArea.Area0000);
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Switch04KCHR(0, CHRArea.Area1000);
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}
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}
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}
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}
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}
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