From: Nicolas Welte (no_spam_at_x1541.de)
Date: 2006-04-30 11:15:10
Hi,
Ruud@baltissen.org wrote:
> All the brooken ones I had in my hands had failing PLA's. I checked that by
> exchanging them with the PLA's of a working 8296. And Jens Schoenfeld can
> deliver PLA replacements AFAIK.
Unfortunately I believe he can't. I have some of his SuperPLA
replacements, but they don't support the 8296 (yet). Of course he had
access to all original PLAs for reading them out (8296, CBM-II, P500,
...), but he didn't implement those yet. And the Plus/4 PLA is said to
have timing problems with the replacement, because there is an external
feedback installed.
I made a replacement for the "small" PLA with a GAL chip. The document
can be found on Funet/Zimmers.
And here you can read how to make replacements from EPROMs:
http://www.vic20.de/html/eprom_pla_8296_und_c64.html
In the 8296 the "small" PLA can be removed and disabled for test
purposes, effectively downgrading it to a plain 8032.
Nicolas
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