Pin Signal Direction Remarks --- ------ ----------- -------- 1 Gnd 2 +5 V Voltage from Mac 3 Gnd 4 TxD+ Voltage from Mac leave open for RS-232 5 TxD- Voltage from Mac use this pin when connecting to RS-232 6 +12 V Voltage from Mac HSKo, Handshake output DTR 7 HSKi Input to Mac 8 RxD+ Input to Mac connect to ground for RS-232 9 RxD- Input to Mac use this pin when connecting to RS-232The jack on the chassis of the Mac is a female socket.
A cable to connect an old Mac 128/512K to serial printers such as the HP DeskWriter or Apple Imagewriter II is available from MacWarehouse (800-255-6227). It has a DB-9 male plug on one end and a DIN-8 plug on the other. (Item number ACC 1312, $4.95 plus $3 for overnight shipping.) The DB-9 end is not wired to transfer data to a PC. This cable is also sold by www.pacificcable.com
Last revised: Sat, Jul 28, 2001