95 lines
2.1 KiB
C#
95 lines
2.1 KiB
C#
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namespace MyNes.Core
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{
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[BoardInfo("Irem H-3001", 65)]
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internal class Mapper065 : Board
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{
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private bool irq_enable;
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private int irq_reload;
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private int irq_counter;
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internal override void HardReset()
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{
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base.HardReset();
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Switch08KPRG(0, PRGArea.Area8000);
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Switch08KPRG(1, PRGArea.AreaA000);
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Switch08KPRG(254, PRGArea.AreaC000);
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Switch08KPRG(PRG_ROM_08KB_Mask, PRGArea.AreaE000);
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}
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internal override void WritePRG(ref ushort address, ref byte data)
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{
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switch (address)
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{
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case 32768:
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Switch08KPRG(data, PRGArea.Area8000);
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break;
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case 36865:
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Switch01KNMTFromMirroring(((data & 0x80) == 128) ? Mirroring.Horz : Mirroring.Vert);
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break;
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case 36867:
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irq_enable = (data & 0x80) == 128;
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NesEmu.IRQFlags &= -9;
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break;
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case 36868:
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irq_counter = irq_reload;
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NesEmu.IRQFlags &= -9;
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break;
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case 36869:
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irq_reload = (irq_reload & 0xFF) | (data << 8);
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break;
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case 36870:
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irq_reload = (irq_reload & 0xFF00) | data;
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break;
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case 40960:
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Switch08KPRG(data, PRGArea.AreaA000);
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break;
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case 49152:
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Switch08KPRG(data, PRGArea.AreaC000);
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break;
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case 45056:
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Switch01KCHR(data, CHRArea.Area0000);
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break;
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case 45057:
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Switch01KCHR(data, CHRArea.Area0400);
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break;
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case 45058:
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Switch01KCHR(data, CHRArea.Area0800);
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break;
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case 45059:
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Switch01KCHR(data, CHRArea.Area0C00);
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break;
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case 45060:
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Switch01KCHR(data, CHRArea.Area1000);
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break;
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case 45061:
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Switch01KCHR(data, CHRArea.Area1400);
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break;
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case 45062:
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Switch01KCHR(data, CHRArea.Area1800);
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break;
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case 45063:
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Switch01KCHR(data, CHRArea.Area1C00);
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break;
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}
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}
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internal override void OnCPUClock()
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{
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if (irq_enable)
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{
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if (irq_counter > 0)
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{
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irq_counter--;
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}
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else if (irq_counter == 0)
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{
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irq_counter = -1;
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NesEmu.IRQFlags |= 8;
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}
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}
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}
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}
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}
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