486DLC/TI486SXL interposer board for cache coherency \ VOGONS

486DLC/TI486SXL interposer board for cache coherency

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First post, by jasa1063

Posted on 2021-09-13, 15:10

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I picked up a TI486SXL/40 CPU and it came with an interposer board. I suspected it was for cache coherency. I did not use the board, because motherboard I used already had support for a TI486SXL/40. I just did a build with a CH-386-33A/40A motherboard with an Opti 82C391B chipset and 128KB cache. I decided to try the interposer board in this system to see what it would do. I am currently using a 486DCL/40 CPU with no options enabled for A20M, BARB or FLUSH input and I have had absolutely no cache coherency issues. I would be interested if anyone has any information about this interposer board.

Last edited by jasa1063 on 2021-09-13, 17:49. Edited 2 times in total.

Reply 1 of 5, by BitWrangler

Posted on 2021-09-13, 16:33

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Interposer is probably the term that would get more recognition.

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Reply 2 of 5, by jasa1063

Posted on 2021-09-13, 17:49

jasa1063 Offline

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BitWrangler wrote on 2021-09-13, 16:33:

Interposer is probably the term that would get more recognition.

Thanks , I updated my post accordingly.

Reply 3 of 5, by cyclone3d

Posted on 2021-09-13, 18:49

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It looks suspiciously like the Evergreen one shown here:
https://www.ardent-tool.com/CPU/386_upgrade.html#386DX2+

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Reply 4 of 5, by Anonymous Coward

Posted on 2021-09-14, 05:44

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Cyrix had a kit that came with one of these too. It was called the 486DRu. The CPU was a regular DLC-40, but their interposer added clock doubling circuitry in addition to the cache coherency.
I guess since you already powered yours on, it probably doesn't clock double since I assume you had your motherboard set for a 40MHz CPU, and doubling to 80MHz would cause the system to not boot up.

I STRONGLY recommend you buy a PGA132 socket to put between this interposer and the socket on your motherboard. These upgrades are known to have fragile pins, and it's easy to snap them off by installing and removing the module too many times.

"Will the highways on the internets become more few?" -Gee Dubya
V'Ger XT|Upgraded AT|Ultimate 386|Super VL/EISA 486|SMP VL/EISA Pentium

Reply 5 of 5, by jasa1063

Posted on 2021-09-14, 15:52

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I noticed how fragile the pins were and decided to removed the interposer. I just enabled the FLUSH input and the 486DLC works fine on it's own. I am just going to hold onto the interposer for now.

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