Path: utzoo!mnetor!uunet!mcvax!ukc!reading!onion!cf-cm!ralph
From: ralph@computing-maths.cardiff.ac.uk (Ralph Martin)
Newsgroups: comp.sys.mac
Subject: Power from serial port
Message-ID: <243@cf-cm.UUCP>
Date: 13 Apr 88 10:38:59 GMT
Organization: Univ. Coll. Cardiff, Cardiff, WALES, UK.
Lines: 7
Posting-Front-End: GNU Emacs 18.47.1 of Mon Nov 23 1987 on v1 (berkeley-unix)


Old Macs used to have a +5v power pin on the serial ports. Alas, newer ones
dont, and I want to connect summat to the serial port which needs a 5v power
supply at, say 20mA. It has been suggested to me that I can just connect to
the Handshake out Pin, and use that for my +5v. This sounds too good to be true
yet I suspect some such trick must work.

Anyone out there like to comment on this? Thanks, Ralph