S100 PROM boards

[Randy McLaughlin]

From: "Cini, Richard" <Richard.Cini at wachovia.com>
Sent: Friday, June 10, 2005 3:09 PM


> All:
>
>
>
>            With my two new machines I want to get a PROM monitor in them 
> so
> I can start really playing around with them. I have a single Vector 
> RAM/PROM
> III board, which uses 2704 or 2708 EPROMS. Most of the chips I have are 
> 2732
> or larger.
>
>
>
>            Before I go slogging through the manual to try to hammer a 4k
> chip into a 1k socket, does anyone have any experience making this mod?
> Alternatively, can someone recommend a good general PROM board that can 
> use
> larger EPROMS (programming feature not necessary).
>
>
>
>            Thanks.
>
>
> Rich

If you are willing to only use 1K it's easy, no changes are required to the 
board:

Start with a 24 pin socket and plug it into the PROM board leaving pins 19 & 
21 hanging out, tie these to ground (pin 12 or any convenient spot).

Plug the 2732 into the socket with the data in the lower 1K.

Please note you can use pins 19 & 21 as extra addressing pins controlled 
either electronically or via switch for mutilple images.

Many options for the "extra" pins are available.

A 28 or 32 pin socket can be used for eeproms etc.

*** Please note this only allows reading, writing is a whole separate story.

I have the source code to several monitors on my site and have access to 
more.  If you ask nicely I'm sure Dave Dunfield will give you a copy of his 
1K 8080 monitor.

Randy
www.s100-manuals.com