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Micro Express ME 386-SX ME 386SX 066-3.1-0889 RAM card

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First post, by Predator99

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I recently got a RAM Card and was looking which mainboard it belongs to.

Front labels:
064-4-0190
9123
9990185273
9122 0610003457

The label on the back shows
Ahnemann-&-Kunze
100101/50907
RAM-KARTE SX-20
06/91

The attachment SX-RAM1.jpg is no longer available
The attachment SX-RAM2.jpg is no longer available
The attachment SX-RAM3.jpg is no longer available

So it belongs to a 386SX-20 RAM card distributed by:
A & K Datentechnik
A+K Datentechnik
A&K Datentechnik
Pfalzburger Str. 71
Hollerallee 24 2800 Bremen

This could be the PC it belongs to :

The attachment 386SX-20.png is no longer available

I am quite sure (but it dont have a proof) this card belongs in a Micro Express ME 386-SX ME 386SX 066-3.1-0889
https://theretroweb.com/motherboards/s/micro- … sx-066-3.1-0889
386 BIOS does not allow to use a user defined hard drive.
http://www.win3x.org/win3board/viewtopic.php? … a164cb23e5e6915

(photo from theretroweb / (MicrobE)):

The attachment ME386SX.jpg is no longer available

- looking at the connectors, it seems to fit 100%
- the "PASS" sticker on the board and the card is excactly the same
- print on the board is "066-3.1-0889". On the card its "064-4-0190". This seems to be the same numbering system with the manufacturing date at the end.

I dont have a proof my assumption is correct and I dont own the mainbaord. If you have it and like to test it, drop me a mail.

Reply 1 of 1, by rasz_pl

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Nice find, and good detective work!
What a sad, lazy and expensive implementation. Despite the ram connector right next to actual ram, this card sits on X-bus together with BIOS and KBC. This bus usually runs at ISA speed or even slower, not the CPU FSB speed meaning ram on this card will run slower than the onboard ram 🙁 So weird considering Chips 82C212 onboard already DOES support up to 8MB and runs at CPU FSB speed, but here someone build additional ram controller out of !35! discrete TTLs, delay line and 3 PALs just to run ram slower. What a waste.

https://github.com/raszpl/sigrok-disk FM/MFM/RLL decoder
https://github.com/raszpl/FIC-486-GAC-2-Cache-Module (AT&T Globalyst)
https://github.com/raszpl/386RC-16 ram board
https://github.com/raszpl/Zenith_ZBIOS Zenith Z-386 MFM-300 ZBIOS disassembly

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