Thanks - I know the C64 is composite - though I plan to use its svideo like output instead. I was just interested in the cga mod for interests sake ... dont know if any other hardware shares the c128's 80 column mode spec? I have an old svideo/composite to vga box in the cupboard .. it stopped working a while back, I'm hoping it was just the power supply. It may be easier for me to get a replacement powerpack for it, than to modify the 5V or 12V from an ATX PSY to the 7.5V it requires.