Re: 82s100 to 27c512 adapter

From: Marko Mäkelä (
Date: 2006-12-18 12:15:30

On Mon, Dec 18, 2006 at 11:26:46AM +0100, "André Fachat" wrote:
> with "the" I mean if this is the one mentioned to by from Jens Schönfeld
> as referred to in the CBM archive. I thought it would be a good idea
> to document this (Jens') adapter if it is referred in the archive.

I wrote a C program to generate EPROM dumps from the logic equations.
You can adapt the pinout in the source code easily by editing the
macros for the signals and the translation for the data lines in
the main program:

"This C program contains the logic equations for the 82S100 PLA chip
used in the C64 (906114-1), and converts them to a 64-kilobyte truth
table file. In this second version of the program, the input and output
lines are permuted so that they correspond to the 82S100-to-27512
adapter built by Jens Schönfeld, so that he could read out the PLA with
an EPROM programming device."

FWIW, I wrote a similar C program for permuting address or data lines
in ROM dumps.  It's trivial if you can keep the image in an array.
My 4 MB Flash ROM cartridge for the VIC-20 (sorry, I haven't got around
to completing the file system generator) permutes some lines to gain
easier circuit board layout.


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