RE: Random Characters

When you walked into the chip lab at CBM circa 1983 on a big piece of
cardboard on the wall was a bunch of polaroid pictures representing the
layout of the Signetics 82S100 PLA, we obviously didn’t want to pay someone
else for a chip we could eventually make ourselves.



*From:* owner-cbm-hackers@musoftware.de [mailto:
owner-cbm-hackers@musoftware.de] *On Behalf Of *Steve Gray
*Sent:* Tuesday, February 07, 2012 11:53 AM
*To:* cbm-hackers@musoftware.de
*Subject:* Re: Random Characters



Rob, you beat me to it. But I'll add that the 6502 has been done as well by
photographing the actual chip by the Visual6502 people (
http://visual6502.org/).

What I would like to see is some recreations of some of the the more
obscure/hard-to-find chips like:

6509, 6525, TED, VIC-III (and the other C65 chips).



Steve



*From:* Clarke Rob (KVYD) <rob.clarke@credit-suisse.com>
*To:* cbm-hackers@musoftware.de
*Sent:* Tuesday, February 7, 2012 11:47:46 AM
*Subject:* RE: Random Characters


Hey Bil - PLA and SID have already been done!

http://retro-donald.de/sinchai-shop/index.php?main_page=page&id=3
http://www.swinkels.tvtom.pl/swinsid/

Rob

-----Original Message-----
From: owner-cbm-hackers@musoftware.de
[mailto:owner-cbm-hackers@musoftware.de] On Behalf Of Bil Herd
Sent: 07 February 2012 17:44
To: cbm-hackers@musoftware.de
Subject: RE: Random Characters

I cant help but feel that using today's FPGA technology and PCB on
socket that it would be possible to make drop in replacements for all of
these old chips, maybe even SID.  Find the right conditions for I/O to
emulate the drive and speed of NMOS lines including going into and out
of Hi-Z .
Someone would have to need one heck of a hobby though.


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