Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site qumix.UUCP Path: utzoo!linus!decvax!ittvax!qumix!len From: len@qumix.UUCP (Leonard Labar) Newsgroups: net.micro,net.micro.cbm Subject: Mac interface to commodore printer Message-ID: <175@qumix.UUCP> Date: Wed, 7-Nov-84 14:27:11 EST Article-I.D.: qumix.175 Posted: Wed Nov 7 14:27:11 1984 Date-Received: Thu, 8-Nov-84 08:08:03 EST Distribution: net Organization: Qume Corp., San Jose, CA Lines: 20 Subject: Mac to Commodore printer interface This is a summary of the request for info on RS422 to IEEE488 that I posted on the net recently. 1. There was more response than I expected. The general consensus seems to be that this requires an extra circuit to handle the timing but nobody knows what it is. 2. The Commodore dot matrix printer does not have a standard IEEE488 interface so that is the wrong word to describe it. 3. The timing is tricky. One response seemed to say that the data is clocked in on the clock pulses. Does anyone know the duty cycle of the clock (on/off time)? Also, is it clocked by edges or when the level is low or high. If I knew this, I might be able to cludge up a 555 timer circuit to generate the clock asyncronously. Just getting it to print at all would be a major step forward.