public void RegisterValueIsSetProperty(int regIndex)
{
// --- Arrange
var spectrum = new SpectrumSoundTestMachine();
var soundDev = new SoundDevice();
soundDev.OnAttachedToVm(spectrum);
soundDev.SetRegisterIndex((byte)regIndex);
// --- Act
soundDev.SetRegisterValue((byte)(regIndex + 1));
// --- Assert
soundDev.LastRegisterIndex.ShouldBe((byte)regIndex);
soundDev.PsgState[(byte)regIndex].ShouldBe((byte)(regIndex + 1));
}
/// <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);
}
}
