Disk archival techniques

[Randy McLaughlin]

From: "M H Stein" <dm561 at torfree.net>
Sent: Friday, May 20, 2005 12:18 AM


> ---------------Original Message:
> Date: Wed, 18 May 2005 14:21:03 -0500
> From: "Randy McLaughlin" <cctalk at randy482.com>
>
> <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

In the future as today an adaptor to current technology is possible, but 
only if the data is saved.

How many of us have ever created a daughter card to adapt a flash ROM to a 
board needing a 2708 etc.


Randy
www.s100-manuals.com