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First post, by tabm0de

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Back again with a question for any one that might know regarding the different Compaq Presario motherboards.

So i am aware of two different models, one with modem and one that has built in cpu ( if im not wrong only the first models did have that ).

Myself i have one with out builtin modem or cpu but i have a connector which i dont know what it is for, there isnt any info on http://th99.classic-computing.de/src/m/C-D/32243.htm so thats no help.

Here is a image with the modem built in:
cp433-large-01.jpg

Here is one of mine which i have the exact copy of with following connection:
B1vthCh_d.jpg?maxwidth=640&shape=thumb&fidelity=medium

Last edited by tabm0de on 2018-07-15, 10:33. Edited 1 time in total.

naa, nothing yet...

Reply 2 of 9, by delinthe

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I'm fairly certain that is an 80 pin SCA connector. They're commonly used for SCSI drives. I'll have to open my 425 and see if I have one as well. I've seen some boards that have an unpopulated pin header in that location.

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Reply 3 of 9, by delinthe

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The top drive has an 80 pin SCA connector so you can compare. I'm not entirely certain what it would be used for in this system however. I don't believe there is a SCSI controller on the motherboard.

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Reply 4 of 9, by perhenden

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Is it possible it's for added cache? I got a similar slot on a socket 7 motherboard that adds cache to the motherboard.
I have a Presario 425 with this slot as well and would love to discover what its purpose is!

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    Here's a bit zoomed in image of the slot
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Reply 5 of 9, by delinthe

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Still not sure what the slot is for but my 425 motherboard doesn't have one, it only has the pads. I took a look at the traces going to the pads and they seem to run to the daughterboard connector, some LS374 chips near by which are flip-flops, and a few run over to the BIOS. If I had to take a guess I'd say it's for some type of expansion module running on the ISA bus.

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Reply 6 of 9, by perhenden

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The only relevant thing I find in the parts manual is "6260 SCSI-2 Controller Board ", other than the modem, which I thought was somewhere else (my board doesn't have the modem).
Maybe the SCSI board makes sense, perhaps this consumer market motherboard model was shared with a business model, Prolinea?

Reply 7 of 9, by tabm0de

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I dont thing it was ever used on presario 4xx, but it seams to be used with compaq prolinea net1/xxs, which the network card is connected to, so i guess its uses the SCA connector but for some type of home made isa slot.
I have been trying to get the network card working on that board without any luck, but i havnt stopped yet to try, someday i will have more time 😉

naa, nothing yet...

Reply 8 of 9, by pampilhoso

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I have the compaq presario cds 520, and that slot is used for plugging in the modem. Here is a photo of the one I have:

FB_IMG_1626424918903.jpg
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The models that dont come with the soldered interface already have an onboard modem, and the ones that have it will also have a metal braket slot for the modem at the back of the computer.

Reply 9 of 9, by tabm0de

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Cool, here is the prolinea card which i havnt got working on my presario.

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naa, nothing yet...