Hi all I didn't see anyone answer Kelly's question, and since I remembered to bring my Super Serial Card manual in today... OK, this is the "Apple ][ Super Serial Card" which I hope is the same as an "Apple Super Serial ][" card... The "Cable Socket" is a 10 pin right angle looks like 0.1" pitch connector. The schematic seems to indicate Pin Name Goes to 1 FRMGND R7 100R to GND 2 TxD Pin 6 on jumper block 3 RxD Pin 12 on jumper block 4 RTS Pin 4 on jumper block 5 CTS Pin 2 on jumper block 6 DSR Pin 10 on jumper block 7 SCTS Pin 8 on switch 2 8 SGLGND GND 9 DTR Pin 8 on jumper block 10 DCD Pins 14 and 16 on jumper block HTH W