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Path: utzoo!watmath!clyde!burl!ulysses!mhuxj!mhuxn!houxm!ihnp4!mgnetp!mgweed!rjr
From: rjr@mgweed.UUCP (Bob Roehrig)
Newsgroups: net.ham-radio
Subject: MBA-TOR/Kantronics non-compatibility!
Message-ID: <14012@mgweed.UUCP>
Date: Thu, 6-Dec-84 08:52:14 EST
Article-I.D.: mgweed.14012
Posted: Thu Dec  6 08:52:14 1984
Date-Received: Fri, 7-Dec-84 02:17:06 EST
Organization: AT&T Consumer Products - Montgomery Illinois
Lines: 20


A friend of mine just got the MBA-TOR rtty package from AEA. He soon
found out that it will NOT work with the Kantronics interface (TU).
He is using the Commodore 64.

There are a couple of signal lines that are inverted in a couple of
the states: rtty data is inverted in the send-space mode, and cw.id
is inverted in the send-mark mode. 

I solved the problem by decoding the leads from the Commodore 64
with a 74LS138 and then re-creating the proper outputs with a
74LS00. 

If anyone out there has the same problem, I will be glad to furnish
the details.

The folks at AEA said "just invert one lead" and were not sympathetic.
I guess that because the cable furnished will fit, they think that
makes it "compatible"!