Interesting Apple ][ card

From: Sellam Ismail <>
Date: Mon Jul 1 20:01:49 2002

On Tue, 2 Jul 2002, Tony Duell wrote:

> With those chip, all it can be is a 2K RAM card (with the PAL used as an
> address decoder/chip select generator). My guess is that it maps into the
> 2K shared ROM space for Apple ][ I/O cards.


> Could it be between the +5V line and ground? Could it be nothing more
> than a decoupling capacitor? Tantalum caps do sometimes explode for no
> good reason, although to find several boards where this has happened
> would be unusual.

It was a very cursory examination. It very well may have been between +5
and Ground. I didn't look up any of the chips in a reference because I
didn't have the time.

> > It seems to me that these computers were part of some network scheme, and
> > that these cards possibly held some networking firmware. How the cap blew
> Yes, they probably held the netork drivers, loaded from disk when the
> machine booted.

But I'm still trying to figure out where the cable went to. Unless there
was a second board in another slot involved, I can't figure out how it
connected to the computer.

Sellam Ismail Vintage Computer Festival
International Man of Intrigue and Danger

 * Old computing resources for business and academia at *
Received on Mon Jul 01 2002 - 20:01:49 BST

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