140 lines
2.5 KiB
C#
140 lines
2.5 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace BizHawk.Emulation.Cores.Computers.Commodore64
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{
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sealed public partial class Motherboard
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{
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bool CassPort_ReadDataOutput()
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{
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return (cpu.PortData & 0x08) != 0;
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}
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bool CassPort_ReadMotor()
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{
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return (cpu.PortData & 0x20) != 0;
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}
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bool Cia0_ReadCnt()
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{
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return (userPort.ReadCounter1Buffer() && cia0.ReadCNTBuffer());
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}
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byte Cia0_ReadPortA()
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{
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return cia0InputLatchA;
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}
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byte Cia0_ReadPortB()
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{
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return cia0InputLatchB;
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}
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bool Cia0_ReadSP()
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{
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return (userPort.ReadSerial1Buffer() && cia0.ReadSPBuffer());
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}
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bool Cia1_ReadCnt()
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{
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return (userPort.ReadCounter2Buffer() && cia1.ReadCNTBuffer());
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}
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byte Cia1_ReadPortA()
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{
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// the low bits are actually the VIC memory address.
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byte result = 0xFF;
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if (serPort.WriteDataIn())
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result &= 0x7F;
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if (serPort.WriteClockIn())
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result &= 0xBF;
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return result;
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}
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bool Cia1_ReadSP()
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{
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return (userPort.ReadSerial2Buffer() && cia1.ReadSPBuffer());
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}
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byte Cpu_ReadPort()
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{
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byte data = 0x1F;
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if (!cassPort.ReadSenseBuffer())
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data &= 0xEF;
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return data;
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}
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bool Glue_ReadIRQ()
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{
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return cia0.ReadIRQBuffer() & vic.ReadIRQBuffer() & cartPort.ReadIRQBuffer();
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}
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bool Pla_ReadCharen()
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{
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return (cpu.PortData & 0x04) != 0;
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}
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byte Pla_ReadCia0(int addr)
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{
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if (addr == 0xDC00 || addr == 0xDC01)
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{
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WriteInputPort();
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inputRead = true;
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}
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return cia0.Read(addr);
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}
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byte Pla_ReadColorRam(int addr)
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{
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byte result = bus;
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result &= 0xF0;
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result |= colorRam.Read(addr);
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return result;
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}
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bool Pla_ReadHiRam()
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{
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return (cpu.PortData & 0x02) != 0;
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}
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bool Pla_ReadLoRam()
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{
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return (cpu.PortData & 0x01) != 0;
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}
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bool SerPort_ReadAtnOut()
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{
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return (cia1.PortBData & 0x08) == 0;
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}
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bool SerPort_ReadClockOut()
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{
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return (cia1.PortAData & 0x10) == 0;
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}
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bool SerPort_ReadDataOut()
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{
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return (cia1.PortAData & 0x20) == 0;
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}
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byte Sid_ReadPotX()
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{
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return 0;
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}
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byte Sid_ReadPotY()
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{
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return 0;
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}
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byte Vic_ReadMemory(int addr)
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{
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// the system sees (cia1.PortAData & 0x3) but we use a shortcut
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addr |= (0x3 - (((cia1.PortALatch & cia1.PortADirection) | (~cia1.PortADirection)) & 0x3)) << 14;
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return pla.VicRead(addr);
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}
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}
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}
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