Re: 6809 / 6702 puzzle

From: William Levak <wlevak_at_SDF.ORG>
Date: Thu, 10 May 2012 04:58:35 +0000 (UTC)
Message-ID: <>
On Mon, 30 Apr 2012, wrote:

> I have just finished my write-up and will e-mail it to Mike later on today
   so that he can include it on his web page along with the disk
> images.
> This document should tell you how to run all the hd (Hello Dave) programs for
   the different languages and what results to expect (as most
> of the Waterloo languages just misbehave if the 6702 check passes but the
   checksum routine for the 6702 sub-routine is incorrect). It will
> also tell you how we identified what byte sequence to add into VICE to make
   it work with the original disks - and how I identified the
> patches to make to the Waterloo disks. if anyone wants to do the same on the
   V1 Waterloo disks - or on a different disk image - this
> document should tell them what to do.

Good write up.  I found it much easier to follow than the collection of 

You describe three routines associated with the copy protection:
     6702 access
     "suicide" routine

Have you tried just NO-OPing out these routines?
SDF Public Access UNIX System -

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Received on 2012-05-10 05:00:36

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