VOGONS


First post, by Moogle!

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Not affiliated with the auction in question, I was just curious about this:

http://i.ebayimg.com/images/g/nK8AAOSwdvpWD08E/s-l1600.jpg

What's up with the bottom ISA slot?

Reply 2 of 7, by Jo22

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Hah, good one! 😁

Seriously, though, that could be a proprietary 32-Bit slot.
Some 386es also had them (for memory boards, etc.)

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Reply 3 of 7, by Moogle!

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Well, that was my first thought as well, but again, on a 486 with on board SIMM sockets?

Though now that I think of it, I've seen it on a Compaq that I used to own, but the proprietary slots were different. It was a PCI/MCA style slot on the end with a 6 pin ISA style slot further back.

Another glance at the picture with the LIF socket suggests it is an older 486. I missed that the first time around.

Reply 4 of 7, by Ampera

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It's so when you want stereo Adlib cards you can throw them in back to back.

Jk. My thought is a proprietary system bus. Maybe some special multimedia function advertised as part of an OEM deal.

Reply 6 of 7, by 8bitbubsy

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It's most likely a memory expansion interface. You can see traces from it snake its way to the SIMM slots. Looks like it's compatible as a normal 16-bit ISA slot too, since you see the left side of the 16-bit connector being tied up with the ISA bus.

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Reply 7 of 7, by cj_reha

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Moogle! wrote:

Well, that was my first thought as well, but again, on a 486 with on board SIMM sockets?

Though now that I think of it, I've seen it on a Compaq that I used to own, but the proprietary slots were different. It was a PCI/MCA style slot on the end with a 6 pin ISA style slot further back.

Another glance at the picture with the LIF socket suggests it is an older 486. I missed that the first time around.

Some boards, like the Asus ISA-386C, have onboard SIMM sockets but also options for an external memory card.

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