ocr: THE SERIAL BUS The C128 Serial Bus is an improved version of the C64/VIC 20 serial bus. The C128 improves this bus by allowing communication at much greater speeds with specially designed peripherals, the most important being the disk drive, while still maintaining capability with older, slower peripherals used by the VIC 20 and the C64. Pin No. Signal Description Serial Interface Connector 1 SERIAL SRO The slow serial bus does not use the SERVICE REQUEST line. The fast serial bus uses it as a fast bidirectional clock line. 2 GND Chassis ground. 3 SERIAL ATN The ATTENTION line is a low active ...
