172 lines
4.0 KiB
C#
172 lines
4.0 KiB
C#
using System.IO;
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namespace MyNes.Core
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{
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[BoardInfo("VRC7", 85)]
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[HassIssues]
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internal class Mapper085 : Board
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{
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private int irq_reload;
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private int irq_counter;
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private int prescaler;
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private bool irq_mode_cycle;
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private bool irq_enable;
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private bool irq_enable_on_ak;
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internal override string Issues => MNInterfaceLanguage.IssueMapper85;
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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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irq_reload = 0;
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prescaler = 341;
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irq_counter = 0;
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irq_mode_cycle = false;
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irq_enable = false;
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irq_enable_on_ak = 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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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 32776:
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case 32784:
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Switch08KPRG(data, PRGArea.AreaA000);
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break;
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case 36864:
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Switch08KPRG(data, PRGArea.AreaC000);
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break;
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case 40960:
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Switch01KCHR(data, CHRArea.Area0000);
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break;
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case 40968:
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case 40976:
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Switch01KCHR(data, CHRArea.Area0400);
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break;
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case 45056:
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Switch01KCHR(data, CHRArea.Area0800);
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break;
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case 45064:
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case 45072:
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Switch01KCHR(data, CHRArea.Area0C00);
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break;
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case 49152:
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Switch01KCHR(data, CHRArea.Area1000);
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break;
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case 49160:
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case 49168:
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Switch01KCHR(data, CHRArea.Area1400);
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break;
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case 53248:
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Switch01KCHR(data, CHRArea.Area1800);
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break;
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case 53256:
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case 53264:
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Switch01KCHR(data, CHRArea.Area1C00);
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break;
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case 57344:
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switch (data & 3)
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{
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case 0:
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Switch01KNMTFromMirroring(Mirroring.Vert);
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break;
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case 1:
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Switch01KNMTFromMirroring(Mirroring.Horz);
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break;
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case 2:
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Switch01KNMTFromMirroring(Mirroring.OneScA);
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break;
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case 3:
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Switch01KNMTFromMirroring(Mirroring.OneScB);
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break;
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}
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break;
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case 57352:
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case 57360:
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irq_reload = data;
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break;
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case 61440:
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irq_mode_cycle = (data & 4) == 4;
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irq_enable = (data & 2) == 2;
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irq_enable_on_ak = (data & 1) == 1;
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if (irq_enable)
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{
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irq_counter = irq_reload;
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prescaler = 341;
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}
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NesEmu.IRQFlags &= -9;
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break;
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case 61448:
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case 61456:
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NesEmu.IRQFlags &= -9;
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irq_enable = irq_enable_on_ak;
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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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return;
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}
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if (!irq_mode_cycle)
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{
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if (prescaler > 0)
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{
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prescaler -= 3;
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return;
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}
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prescaler = 341;
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irq_counter++;
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if (irq_counter == 255)
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{
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NesEmu.IRQFlags |= 8;
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irq_counter = irq_reload;
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}
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}
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else
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{
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irq_counter++;
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if (irq_counter == 255)
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{
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NesEmu.IRQFlags |= 8;
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irq_counter = irq_reload;
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}
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}
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}
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internal override void WriteStateData(ref BinaryWriter stream)
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{
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base.WriteStateData(ref stream);
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stream.Write(prescaler);
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stream.Write(irq_counter);
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stream.Write(irq_mode_cycle);
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stream.Write(irq_reload);
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stream.Write(irq_enable);
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stream.Write(irq_enable_on_ak);
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}
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internal override void ReadStateData(ref BinaryReader stream)
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{
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base.ReadStateData(ref stream);
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prescaler = stream.ReadInt32();
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irq_counter = stream.ReadInt32();
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irq_mode_cycle = stream.ReadBoolean();
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irq_reload = stream.ReadInt32();
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irq_enable = stream.ReadBoolean();
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irq_enable_on_ak = stream.ReadBoolean();
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}
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}
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}
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