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Looking for ASUS 486/25 External Memory Card Info or Reproduction Help

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First post, by The Fritz

Posted on 
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Hi everyone,
I own an original ASUS 486/25 motherboard (as listed here: https://theretroweb.com/motherboards/s/asus-486-25) in excellent condition.

Unfortunately, I’m missing the external memory card required for RAM expansion.
The board powers up and POSTs up to the RAM check using a POST analyzer, but obviously can’t continue without memory.

I’m looking for:

Technical data, photos, or measurements of the original memory card

Pinout information for the memory card connector

Any experience or documentation about building a replacement card or reproduction project

If anyone has an original card, I'd also be interested in photos or detailed scans.

Thank you very much in advance!

Reply 1 of 1, by vetz

Posted on 
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l33t

It could well be that the memory expansion board is compatible with other early ASUS 486 boards. The connector looks to be the same.

Check out ASUS ISA-486C. There are pictures of the memory card on TRW.

There's a card for sale on Ebay right now. https://www.ebay.com/itm/357028305138

Also vogons user Amigaz appear to own such a card: isa 386c cache apparently not working [now fixed]

PS. You should take pictures and dump the BIOS for your board and upload to TheRetroWeb as its missing for your board. I've also never heard about the 486/25 so it must be rare.

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