RE: 6502/6510 ROM selection daughterboard

From: Bil Herd <*bherd_at_mercury-cg.com*> Date: Tue, 5 Jun 2012 07:57:23 -0400 Message-ID: <7920515231e73a6e0a7c84efa7327e58@mail.gmail.com> · bherd_at_mercury-cg.com

Does the community have the actual PLA terms as source for the various
devices or are they all/mostly reverse engineered?

-----Original Message-----
From: owner-cbm-hackers@musoftware.de
[mailto:owner-cbm-hackers@musoftware.de] On Behalf Of Michal Pleban
Sent: Tuesday, June 05, 2012 2:45 AM
To: cbm-hackers@musoftware.de
Subject: Re: 6502/6510 ROM selection daughterboard

Hello!

silverdr@wfmh.org.pl wrote:

> I don't see this as a deal breaker type of problem. The same applies
> to ROMs. Yet people exchange them or replace with EPROM adapters, etc.

That's a good point. Well, if we decide to go this route, I don't see any
problems in doing this type of extension. I can do it, actually.

Plus, the character ROM replacement can then be done simply by un-socketing
the CHAR ROM chip, and placing a single wire from the CS# line to the CPU
extension board (assuming the CHAR ROM is socketed too).

> Could you maybe publish it? On zimmers for example?

Yes. I designed a PLA replacement circuit, and I intend to read and decode
every PLA that comes into my hands :-) I am missing only the 8296 now, plus
waiting for the 1551 to arrive from Ebay.de. When I have all the stuff
ready, I will publish it.

Regards,
Michau.

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