"Bryan Parkoff" <BParkoff@satx.rr.com> writes: > Do you know which I/O address $D010 through $D013 are mapped to $C000 > for Keyboard Input and Display Output? Not offhand. > are $400-$7FF for display the same? No. The Apple I display is NOT memory mapped. You write characters to it through one of the PIA ports. There's no way to read it back.