Apple color classic Service Manual
Specifications
I/O Interfaces - 6
I/O Interfaces
Serial
Two RS-232/RS-422 serial ports; mini DIN-8 connectors
SCSI
One SCSI parallel port; DB-25 connector
Connects up to six external SCSI devices
Apple Desktop Bus
Two ADB ports; mini DIN-4 connector
Maximum of three ADB devices recommended
Maximum current draw: 500 mA (Mouse draws 10 mA, keyboard
draws 25 mA)