Re: 6809 / 6702 puzzle

From: William Levak <wlevak_at_SDF.ORG>
Date: Sun, 12 Feb 2012 03:25:10 +0000 (UTC)
Message-ID: <Pine.NEB.4.64.1202120317310.7476@sdf.lonestar.org>
On Sun, 5 Feb 2012, Mike Naberezny wrote:

> There you'll find a D80 image with a version of the editor that was improved 
> by ISPUG (International SuperPET Users Group) members.  One of the 
> improvements is that the check for the dongle has been removed.  I've 
> verified that the editor does start up on a SuperPET with the 6702 removed.

If the 6702 is nothing more than a dongle, then it is most likely a logic 
array.  Checking my old data books, I find the Monolithic Memories PAL 20 
series.  These have enable on 1, ground on 10, clock on 11, VCC on 20, 
inputs on 2-9, and outputs on 12-19.  If you switch the inputs with the 
outputs, you have a 6702.

This should be easy to crack.  Pull the daughter board, put a test clip on 
the 6702, and wire lines to an eprom programmer, and read it out like a 
256 byte ROM.

wlevak@sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org

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Received on 2012-02-12 04:00:08

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