Had anyone made a little adapter to adapt 18 pin DIP to SOJ 20 pin? Soldered together. UPDATE: added a example. \ VOGONS

Had anyone made a little adapter to adapt 18 pin DIP to SOJ 20 pin? Soldered together. UPDATE: added a example.

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First post, by pentiumspeed

Posted on 2020-09-07, 02:46

pentiumspeed Offline

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4mb DIMMs are plentiful and easy to get to harvest for 1mb x 1bit ICs but the footprint is same as 18 pin DIP IC so need to have adapter board with 20 pin SOJ solder pads on one side, other side pads for 18 pins and soldered together and installed on the memory expansion card. I need to do that 36 pieces and height is a issue but that stacked height is not a problem.

There only one that is quantity is 18 pin 1MB x 1bit chips seller on the ebay but nothing found by other sellers offered that I need.

Even I could solder in 4mb 72 pin memory to all the points on the card but that looks ghetto.

This is for the 1mb kingston 32 bit memory expansion card for the compaq deskpro 386/25e and other that use same slot design.
This card has two spots, which can either 1mb which what I have, other unused solder points are for 4MB configuration.

Similar in idea what i described.

https://www.ebay.ca/itm/20-PCS-SOP16-SMT-to-D … vgAAOSw1~JZSE-V

Cheers,

Great Northern aka Canada.

Reply 1 of 2, by Horun

Posted on 2020-09-07, 04:44

Horun Offline

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That is interesting, hope it works and no have never considered going that extreme to upgrade an older proprietary system. Curious how common those expansion cards are and the overall cost of card plus modification compared to a generic 386 AT motherboard that uses SIMMS + desktop case.

Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. Stuff: https://archive.org/details/@horun

Reply 2 of 2, by maxtherabbit

Posted on 2020-09-07, 15:32

maxtherabbit Offline

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I don't think there would be a way to do it on a single adapter PCB. The footprints overlap and using SMD dupont headers would be too wide. You would have to make two stacking PCBs, one with a DIP-18 footprint and tiny connector in the middle and one with the SOJ footprint to plug in to the top. Probably not worth it

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