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From: jko@homer.UUCP (Jonathan O'Neal)
Newsgroups: comp.sys.atari.8bit
Subject: Re: ATR8000 & ST controls 8bit
Message-ID: <1991Jun20.213942.7497@homer.UUCP>
Date: 20 Jun 91 21:39:42 GMT
References: <9106160153.AA00321@sun.soe.clarkson.edu>
Organization: SCS/Compute, Inc.
Lines: 21

In <9106160153.AA00321@sun.soe.clarkson.edu> AAron@sun.soe.clarkson.edu writes:

>1) Does anyone know what the cable looks like that you use to hook up
>   your ATR8000 to an RS232 terminal instead of an Atari, for CPM?
>   I believe it hooks into the SIO port of the ATR8000, but I cannot
>   figure out which pins are needed... I have experimented, after changing
>   the jumpers J7 and J10, but had no luck.

   SWP sold a proprietary SIO<->DB25 cable that I refused to pay for.  I
mounted a DB25 female jack on the back of my ATR and put a 3P2T switch on
the front.  The salient SIO pins are 3 (Data in), 5 (Data out), and 6 (Ground).
I wired these to their analogous RS-232 pins on the DB25 (2, 3, & 7), and
wired the switch to J7 and J10.  Now all I have to do is flip the switch
to select Atari or CP/M mode.

   All in all, the ATR-8000 was a nice piece of work for its day (and for its
purpose).  Mine still sees some use...

>-AAron

   -jko