byte ReadLogPort(object sender, ushort address)
{
switch (address & 0xFF)
{
case 0x00: // D-Bus
return(3); //DBus.ReadLines();
case 0x01: // Keypad
return(Keypad.Read());
case 0x02: // TODO: System status
// Bit 1 is the LCD ready timer.
return((byte)(1 | 2 | (Mapper.FlashWriteEnable ? 4 : 0) | 0xE0));
case 0x03: // Interrupt mask
// TODO: DBus interrupt enable
return((byte)((Keypad.OnInterruptEnable ? 1 : 0) | (Apd.GenerateInterrupt ? 2 : 0) | (PApd.GenerateInterrupt ? 4 : 0) | 16)); // | (DBus.I));
case 0x04: // Interrupt ID
return((byte)((Keypad.OnKey ? 0 : 8) | ((byte)Interrupts & 0xFF) | (CrystalTimer1.HasExpired ? 0x20 : 0) | (CrystalTimer2.HasExpired ? 0x40 : 0) | (CrystalTimer3.HasExpired ? 0x80 : 0)));
case 0x05: // Memory page C
return((byte)Mapper.PageC);
case 0x06: // Memory page A lower bits
return((byte)((Mapper.PageA & 0x7F) | (Mapper.PageAIsRam ? 0x80 : 0)));
case 0x07: // Memory page B lower bits
return((byte)((Mapper.PageB & 0x7F) | (Mapper.PageBIsRam ? 0x80 : 0)));
case 0x08: // TODO: UART enable
return(0x80);
case 0x09: // TODO: UART status & signaling rate 0
return(0);
case 0x0A: // TODO: UART read buffer
return(0);
case 0x0B: // TODO
case 0x0C: // TODO
case 0x0D: // UART write buffer
return(0);
case 0x0E: // Memory page A upper bits
return((byte)(Mapper.PageA >> 7));
case 0x0F: // Memory page B upper bits
return((byte)(Mapper.PageB >> 7));
case 0x10: // LCD command port
case 0x12:
return(Lcd.GetCurrentRegister());
case 0x11: // LCD data port
case 0x13:
return(Lcd.ReadData());
case 0x14: // Flash write enable
return(0);
case 0x15: // Gate array ID
return(0x45);
case 0x16: // Does nothing; this port's function has been moved.
return(0);
case 0x17: // "Reserved for debug," whatever that means.
return(0);
case 0x18: // TODO: MD5 ports
case 0x19: // See http://www.faqs.org/rfcs/rfc1321.html
case 0x1A:
case 0x1B:
case 0x1C:
case 0x1D:
case 0x1E:
case 0x1F:
return(0);
case 0x20: // CPU speed
return((byte)CpuSpeed);
case 0x21: // Flash & RAM size
return((byte)((Mapper.FlashType) | (Mapper.RamType << 4)));
case 0x22: // Flash execution lower limit
return((byte)(Mapper.FlashLowerLimit));
case 0x23: // Flash execution upper limit
return((byte)Mapper.FlashUpperLimit);
case 0x24: // Flash execution limit hight bits
return((byte)((Mapper.FlashLowerLimit >> 8) | ((Mapper.FlashUpperLimit >> 7) & 2)));
case 0x25: // RAM execution lower limit
return((byte)(Mapper.RamLowerLimit));
case 0x26: // RAM execution upper limit
return((byte)(Mapper.RamUpperLimit));
case 0x27: // Stack space always present
return((byte)(Mapper.UpperPageAlwaysPresentAmount));
case 0x28: // System variables always present
return((byte)(Mapper.LowerPageAlwaysPresentAmount));
case 0x29: // CPU mode 0 delays
case 0x2A:
case 0x2B:
case 0x2C:
return(0); // Whatever.
case 0x2D: // 32768 Hz crystal control
return(3);
case 0x2E: // Memory access delay
return(0);
case 0x2F:
return(0x4B);
case 0x30: // Crystal timer 1 frequency
return(CrystalTimer1.GetMode());
case 0x31: // Crystal timer 1 loop control
return(CrystalTimer1.GetLoopStatus());
case 0x32: // Crystal timer 1 count
return(CrystalTimer1.GetCount());
case 0x33: // Crystal timer 2 frequency
return(CrystalTimer2.GetMode());
case 0x34: // Crystal timer 2 loop control
return(CrystalTimer2.GetLoopStatus());
case 0x35: // Crystal timer 2 count
return(CrystalTimer2.GetCount());
case 0x36: // Crystal timer 3 frequency
return(CrystalTimer3.GetMode());
case 0x37: // Crystal timer 3 loop control
return(CrystalTimer3.GetLoopStatus());
case 0x38: // Crystal timer 3 count
return(CrystalTimer3.GetCount());
case 0x39: // GPIO direction
return(GpioDirection);
case 0x3A: // GPIO data
return(GpioData);
// Dummy USB implementation
case 0x4A:
return(0x24);
case 0x4C:
return(0x22);
case 0x4D:
return(0xA5);
case 0x55:
return(0x1F);
case 0x56:
return(0x50);
case 0x57:
return(0x50);
case 0x5B:
return(0);
case 0x80:
return(0);
case 0x49:
case 0x4B:
case 0x4E:
case 0x4F:
case 0x50:
case 0x51:
case 0x52:
case 0x53:
case 0x54:
case 0x58:
case 0x59:
case 0x5A:
case 0x5C:
case 0x5D:
case 0x5E:
case 0x5F:
case 0x81:
case 0x82:
case 0x83:
case 0x84:
case 0x85:
case 0x86:
case 0x87:
case 0x88:
case 0x89:
case 0x8A:
case 0x8B:
case 0x8C:
case 0x8D:
case 0x8E:
case 0x8F:
case 0xA0:
case 0xA1:
case 0xA2:
case 0xA3:
case 0xA4:
case 0xA5:
case 0xA6:
case 0xA7:
case 0xA8:
case 0xA9:
case 0xAA:
case 0xAB:
case 0xAC:
case 0xAD:
case 0xAE:
case 0xAF:
return(255);
}
return(0);
}