public byte peek(UInt16 address)
{
switch (address)
{
case 0:
return(dir);
case 1:
{
byte retval = dataRead;
// for unused bits in input mode, the value comes from the "capacitor"
// set real value of bit 6
if ((dir & 0x40) == 0)
{
retval &= (byte)(0xbf); // ~0x40;
retval |= dataBit6.readBit(pla.getPhi2Time());
}
// set real value of bit 7
if ((dir & 0x80) == 0)
{
retval &= (byte)(0x7f); // ~0x80;
retval |= dataBit7.readBit(pla.getPhi2Time());
}
return(retval);
}
default:
return(ramBank.peek(address));
}
}
// RAM access methods
public override byte readMemByte(UInt16 addr)
{
return(ramBank.peek(addr));
}