Could a Parallel interface be created for the clone using traditional Shift Register ICs? I understand that the serial port bit rate is software limited to 9600, but since the clone can kick up to 115,520 could the firmware be updated to support such a feat? (perhaps even higher than the 115k?) Honestly, from a Computer Engineering perspective, I don't see why it cannot be done, unless I am missing something in my way of thinking.
BTW, I began restoration work of my 8800 Clone, I have to say, Solder Flux makes a tremendous difference!