Serial Port Docs.Txt

MIT EE claims it is benign but confusing. Caveat Solderor... This document contains notes on the Macintosh serial port and its use, with concentration on hardware interface issues. *** DANGER WARNING WILL ROBINSON!!! *** The DB-25 on the back of a Macintosh is NOT a serial port! It is a SCSI parallel port. Any attempt to use this connector as a serial port will NOT function correctly and may cause damage to the Macintosh and/or the equipment being connected. The two serial ports of a Macintosh are mini-Din-8 connectors which are labeled with a telephone (the "modem port") and a printer ("printer port"). This is the pinout of the serial connectors. We are looking at the back of the Macintosh (or alternatively at the BACK of a male plug):