Disk archival techniques

[M H Stein]

---------------Original Message:

Date: Wed, 18 May 2005 14:21:03 -0500
From: "Randy McLaughlin" <cctalk at randy482.com>
Subject: Re: Disk archival techniques

<snip>
Using one manufacturer as an example - Cromemco used bipolar PROMs and made 
their own numbers - 749XX.  This makes it confusing but easy to spot when 
seen.  They would use the chips on multiple boards keeping the same 
programming by chipnumber i.e. 74901 could be used on a floppy controller or 
memory card and still be interchangeable (I just made up an example but I've 
seen common 749XX across different types of cards).

Randy
www.s100-manuals.com 

-------------Reply:

As a matter of fact, I just dumped several Cromemco PROMs a while ago for archival use;
what's the recommendation for 4 bit PROMs? 8 bits with hex F's in the upper nibble, or?

And are we going to be able to find blank bipolar PROMS or PALs in 10 or 20 years?

mike