S100 PROM boards

[Randy McLaughlin]

From: "Dwight K. Elvey" <dwight.elvey at amd.com>
Sent: Friday, June 10, 2005 5:00 PM


> >From: "Ethan Dicks" <ethan.dicks at gmail.com>
>>
>>On 6/10/05, Dwight K. Elvey <dwight.elvey at amd.com> wrote:
>>> >If you are willing to only use 1K it's easy, no changes are required to 
>>> >the
>>> >board:
>>>
>>>  I'm not sure how you would define removing a power supply lead
>>> but I'd call that a change??
>>> Dwight
>>
>>Socket the 2732 with that pin hanging out of the socket.  You can even
>>tie it to Vcc or GND with a jumper wire to either pin 12 or pin 24...
>>no need to mod the board, just the 2732.
>>
>>-ethan
>>
>>
>
> Hi
> I'd stack two machine pin sockets, with jumpers and
> pins removed, but that isn't what was said.
> Dwight

The instructions I gave had no changes 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)."

This merely uses a socket as a daughter card rewiring the connections needed 
to have a 2732 act as a 2708 in read only mode.

The power leads (12V & -5V) on the PROM board are not removed, they are just 
ignored.

The board stays original, the 2732 is not modified and just by removing the 
modified stacked socket everything is restored.  No matter what type of 
collector you are this shouldn't ruffle any feathers, the board is made 
operational with newer components without modifying a collectable card.

As I also pointed out using this routine you can replace a 2708 or better 
with anything in the same family which includes Flash ROM's and EEPROM's. 
For those unfamiliar the 2704/2708 pinout are the standard still used today 
with only minor changes related to power supply and programming.  These 
"minor" changes make it easy to use newer parts for the read only portion, 
even the programming can be handled with a little effort.


Randy
www.s100-manuals.com