Serial Port Docs.Txt

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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):