Re: Very mysterious card

["Rick Kerman" <rkerman@mail.bright.net>]

Rubywand wrote in message <3591C52F.106DEED1@swbell.net>...

>Louis Schulman writes ...
>>
>> This card was found in slot 5 of an Apple //e, and was specifically
marked
>> for slot 5.  The main chip is an AM25L04PC, which is not even listed in
the
>> Chip Directory

>The AM25L04 appears to be a 12-bit successive approximation
>register. Perhaps the card was used to interface with some piece of
>laboratory equipment.


That's a possibility, however there was also a 25xx series of mask
ROMs, parallel to the 27xx EPROMs and 28xx EEPROMs.  The
L in the middle would indicate low power version.  It could be a
512 byte slot ROM.  You might try disassembling the address
space allocated to the card to see if you find a company name/
copyright notice.  The pots suggest adjustable voltage or timing
circuits, which wouldn't seem needed for a printer card, which
was one of the other suggestions.  I don't really know what it is,
just throwing out ideas.

Rick Kerman <rkerman@mail.bright.net>
http://www.bright.net/~rkerman