Re: Ultimax questions

From: Marko Mäkelä <>
Date: Thu, 10 May 2012 09:11:14 +0300
Message-ID: <20120510061114.GB2814@x220>
On Thu, May 10, 2012 at 06:15:50AM +0200, Groepaz wrote:
>hu? whats wrong with it and where is the correct one then?
>i very much doubt noone noticed that in 25 years =) (and it was 
>veryfied by various ppl against other dumps)

Which dump is 25 years old? I think it was 1994 when Jens Schönefeld 
uploaded his 64KB PLA "truth table" dump to the German Z-Netz Commodore 
discussion group. Among others, Andreas Boose and I guessed the 
equations and verified the guesses by writing a C program that generated 
the same outputs from the inputs. The CASRAM equation was the hardest 
nut to crack. A few years later, it emerged that the PLA did support 
negation at the top level, allowing the equation to be simplified.

Best regards,


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Received on 2012-05-10 07:00:10

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