Exemplo n.º 1
0
 /// <summary>
 /// Loads the content of the ROM through the specified provider
 /// </summary>
 /// <param name="romDevice">ROM device instance</param>
 /// <param name="romConfig">ROM configuration</param>
 /// <remarks>
 /// The content of the ROM is copied into the memory
 /// </remarks>
 public void InitRom(IRomDevice romDevice, IRomConfiguration romConfig)
 {
     for (var i = 0; i < romConfig.NumberOfRoms; i++)
     {
         MemoryDevice.SelectRom(i);
         MemoryDevice.CopyRom(romDevice.GetRomBytes(i));
     }
     MemoryDevice.SelectRom(0);
 }
Exemplo n.º 2
0
        /// <summary>
        /// Sends a byte to the port with the specified address
        /// </summary>
        /// <param name="addr">Port address</param>
        /// <param name="data">Data to write to the port</param>
        /// <returns>Byte read from the memory</returns>
        public override void WritePort(ushort addr, byte data)
        {
            HandleSpectrum48PortWrites(addr, data);

            // --- Port 0x7FFD, bit 14 set, bit 15 and bit 1 reset
            if ((addr & 0xC002) == 0x4000)
            {
                // --- When paging is disabled, it will be enabled next time
                // --- only after reset
                if (PagingEnabled)
                {
                    // --- Choose the RAM bank for Slot 3 (0xc000-0xffff)
                    LastSlot3Index = data & 0x07;
                    MemoryDevice.PageIn(3, LastSlot3Index);

                    // --- Choose screen (Bank 5 or 7)
                    MemoryDevice.UseShadowScreen = ((data >> 3) & 0x01) == 0x01;

                    // --- Choose ROM bank for Slot 0 (0x0000-0x3fff)
                    SelectRomLow = (byte)((data >> 4) & 0x01);

                    // --- Enable/disable paging
                    PagingEnabled = (data & 0x20) == 0x00;

                    // --- Page the ROM according to current settings
                    MemoryDevice.SelectRom(SelectRomHigh | SelectRomLow);
                }
            }
            // --- Port 0x1FFD, bit 12 set, bit 1, 13, 14 and 15 reset
            else if ((addr & 0xF002) == 0x1000)
            {
                PagingMode        = (data & 0x01) != 0;
                SpecialConfig     = (byte)((data >> 1) & 0x03);
                DiskMotorState    = (data & 0x08) != 0;
                PrinterPortStrobe = (data & 0x10) != 0;
                SelectRomHigh     = (byte)((data >> 1) & 0x02);

                // --- Page the ROM according to current settings
                if (PagingMode)
                {
                    // --- Special paging mode
                    switch (SpecialConfig)
                    {
                    case 0:
                        MemoryDevice.PageIn(0, 0);
                        MemoryDevice.PageIn(1, 1);
                        MemoryDevice.PageIn(2, 2);
                        MemoryDevice.PageIn(3, 3);
                        break;

                    case 1:
                        MemoryDevice.PageIn(0, 4);
                        MemoryDevice.PageIn(1, 5);
                        MemoryDevice.PageIn(2, 6);
                        MemoryDevice.PageIn(3, 7);
                        break;

                    case 2:
                        MemoryDevice.PageIn(0, 4);
                        MemoryDevice.PageIn(1, 5);
                        MemoryDevice.PageIn(2, 6);
                        MemoryDevice.PageIn(3, 3);
                        break;

                    case 3:
                        MemoryDevice.PageIn(0, 4);
                        MemoryDevice.PageIn(1, 7);
                        MemoryDevice.PageIn(2, 6);
                        MemoryDevice.PageIn(3, 3);
                        break;
                    }
                }
                else
                {
                    // --- Normal mode
                    MemoryDevice.PageIn(1, 5);
                    MemoryDevice.PageIn(2, 2);
                    MemoryDevice.PageIn(3, LastSlot3Index);
                    MemoryDevice.SelectRom(SelectRomHigh | SelectRomLow);
                }
            }
            else if (addr == 0xFFFD)
            {
                SoundDevice.SetRegisterIndex(data);
            }
            else if (addr == 0xBFFD || addr == 0xBEFD)
            {
                SoundDevice.SetRegisterValue(data);
            }
        }