98 lines
2.3 KiB
C#
98 lines
2.3 KiB
C#
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namespace MyNes.Core
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{
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[BoardInfo("Pirate SMB3", 56)]
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internal class Mapper056 : Board
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{
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private int irqCounter;
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private int irqLatch;
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private bool irqEnabled;
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private int irqControl;
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private int switchControl;
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internal override string Issues => MNInterfaceLanguage.IssueMapper56;
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internal override void HardReset()
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{
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base.HardReset();
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Switch08KPRG(PRG_ROM_08KB_Mask, PRGArea.AreaE000);
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irqLatch = 0;
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irqCounter = 0;
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irqControl = 0;
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irqEnabled = false;
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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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if (address < 61440)
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{
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switch (address & 0xE000)
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{
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case 32768:
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irqLatch = (irqLatch & 0xFFF0) | (data & 0xF);
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break;
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case 36864:
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irqLatch = (irqLatch & 0xFF0F) | ((data & 0xF) << 4);
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break;
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case 40960:
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irqLatch = (irqLatch & 0xF0FF) | ((data & 0xF) << 8);
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break;
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case 45056:
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irqLatch = (irqLatch & 0xFFF) | ((data & 0xF) << 12);
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break;
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case 49152:
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irqControl = data & 5;
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irqEnabled = (data & 2) == 2;
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if (irqEnabled)
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{
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irqCounter = irqLatch;
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}
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NesEmu.IRQFlags &= -9;
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break;
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case 53248:
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irqEnabled = (irqControl & 1) == 1;
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NesEmu.IRQFlags &= -9;
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break;
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case 57344:
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switchControl = data;
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break;
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}
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return;
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}
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int num = (switchControl & 0xF) - 1;
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if (num < 3)
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{
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Switch08KPRG((data & 0xF) | (PRG_AREA_BLK_INDEX[(num >> 13) + 1] & 0x10), (PRGArea)num);
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}
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switch (address & 0xC00)
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{
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case 0:
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address &= 3;
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if (address < 3)
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{
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Switch08KPRG((data & 0xF) | (PRG_AREA_BLK_INDEX[(num >> 13) + 1] & 0x10), (PRGArea)address);
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}
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break;
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case 2048:
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Switch01KNMTFromMirroring(((data & 1) == 1) ? Mirroring.Vert : Mirroring.Horz);
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break;
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case 3072:
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Switch01KCHR(data, (CHRArea)(address & 7u));
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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 (irqEnabled && irqCounter++ == 65535)
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{
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irqCounter = irqLatch;
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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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