Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!linus!decvax!ittvax!bunker!jrh From: jrh@bunker.UUCP (Jeff Hagen) Newsgroups: net.micro Subject: hardware question Message-ID: <502@bunker.UUCP> Date: Mon, 20-Aug-84 14:38:55 EDT Article-I.D.: bunker.502 Posted: Mon Aug 20 14:38:55 1984 Date-Received: Wed, 22-Aug-84 03:38:49 EDT Lines: 26 xxxx Here is a little hardware problem I came across: I have and old TI thermal printer (PC100A) that works with their 58/59 calculators. I thought it might be kind of neat to interface it to my computer. I have the description of the calculator/printer interface (from the TI technical manual). problem : The five unidirectional logic lines in the interface use a 0 volt to -10 volt logic. question: Is this TI logic some sort of standard? and more importantly, Is there an easy way to interface it to TTL ? Someone suggested a high speed op amp, but isn't this overkill? (the clock frequency is about 227khz ). Thanks for listening Jeff Hagen ittvax!bunker!jrh