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: RS422 to IEEE488 convert
Message-ID: <152@qumix.UUCP>
Date: Sat, 3-Nov-84 19:51:05 EST
Article-I.D.: qumix.152
Posted: Sat Nov  3 19:51:05 1984
Date-Received: Sun, 4-Nov-84 04:41:53 EST
Distribution: net
Organization: Qume Corp., San Jose, CA
Lines: 24


I've been attempting to connect a commodore vic-1525 dot matrix printer
to my Macintosh with no success.  Below is the connection scheme.  I'm
sure of my connector pinouts.  Maybe someone can help me out on the
handshaking timing required.  The printer does NOTHING.

MAC        function                          PRINTER    function
---        --------                          -------    --------

1          ground ---------------------------- 2        ground
2           +5v                                n.c.
3          ground                              n.c.
4          TXD+ ------------------------------ 5      serial data
5          TXD-                                n.c.
6          +12v                                n.c.
7          printer handshake ----------------- 3      serial atn i/o
8          RXD+                                n.c.
9          RXD-                                n.c.
	   n.c.                                1      serial srq in
	   n.c.                                4      serial clk i/o
	   n.c.                                6      reset/

It seems like what is required is an RS422 to IEE488 converter circuit.
Does anyone know an economical, easy way to do this?  Help!