private void WritePort(ushort port, byte value)
{
port &= 0xFF;
if (port >= 0xA0 && port <= 0xBF)
{
if ((port & 1) == 0)
{
_vdp.WriteVdpData(value);
}
else
{
_vdp.WriteVdpControl(value);
}
return;
}
if (port >= 0x80 && port <= 0x9F)
{
_inputPortSelection = InputPortMode.Right;
return;
}
if (port >= 0xC0 && port <= 0xDF)
{
_inputPortSelection = InputPortMode.Left;
return;
}
if (port >= 0xE0)
{
PSG.WritePsgData(value, _cpu.TotalExecutedCycles);
}
}
private void WritePort(ushort port, byte value)
{
port &= 0xFF;
if (port >= 0xA0 && port <= 0xBF)
{
if ((port & 1) == 0)
{
_vdp.WriteVdpData(value);
}
else
{
_vdp.WriteVdpControl(value);
}
return;
}
if (port >= 0x80 && port <= 0x9F)
{
_inputPortSelection = InputPortMode.Right;
return;
}
if (port >= 0xC0 && port <= 0xDF)
{
_inputPortSelection = InputPortMode.Left;
return;
}
if (port >= 0xE0)
{
PSG.WriteReg(value);
}
if (use_SGM)
{
if (port == 0x50)
{
SGM_sound.port_sel = (byte)(value & 0xF);
}
if (port == 0x51)
{
SGM_sound.WriteReg(value);
}
if (port == 0x53)
{
if ((value & 1) > 0)
{
enable_SGM_high = true;
}
else
{
// NOTE: the documentation states that you shouldn't turn RAM back off once enabling it
// so we won't do anything here
}
port_0x53 = value;
}
if (port == 0x7F)
{
if (value == 0xF)
{
enable_SGM_low = false;
}
else if (value == 0xD)
{
enable_SGM_low = true;
}
port_0x7F = value;
}
}
}