• Please review our updated Terms and Rules here

Mistery Switches on the processor board - what are they?

N

NightShadowPT

Member
Joined
Sep 30, 2022
Messages
15
Hi,

Does anyone know what these switches next to the processor do? - see photo

This is a Compaq Deskpro 486/33M processor board (part number 129127-001), but I cannot find any manual online that would answer the question…

My best guess is that they will allow me to select the voltage, bus speed or both, but have no ideia where to get confirmation…

If anyone has the manual at home and can take a picture or knows of a link with the full manual, please let me know. It will be much appreciated.

Thanks in advance
 

Attachments

  • ProcessoBoardSwitches.jpeg
    ProcessoBoardSwitches.jpeg
    1.4 MB · Views: 27
Strange, have 3 non working compaq boards and none of them have those switches... I know on mine that is the FSB (25/33) and SX/DX jumper block, But all mine use jumpers. All the machines I ever seen with this chassis only support 5v processors. Which is fine since you already have a 5v Cyrix in there. 👍
 
twolazy said:
Strange, have 3 non working compaq boards and none of them have those switches... I know on mine that is the FSB (25/33) and SX/DX jumper block, But all mine use jumpers. All the machines I ever seen with this chassis only support 5v processors. Which is fine since you already have a 5v Cyrix in there. 👍
Click to expand...

Yeah, that's why I was asking.

I'm looking to see what are my options when it comes to an upgrade, and if it's 5V only I'm stuck with this processor (or an expensive intel Overdrive), while if 3v is an option I could procure a much cheaper 486DX4...

Do you have any documentation on what that jumper block does on your cards?

Cheers,
 
Maybe not even that. Some of the more "oddball" Compaqs tend to be fussy about upgrading. I tried upgrading a Prosignia server above the 486DX/66....it wasn't happy.
 
These deskpros have no L2 cache unlike the Prosignia series, and they are POD upgradable. Never tried it though. Keep it as a slow 486. If you need faster build a Pentium system as a brother. A Dx2/66 should be about as fast as a cached 33 or 40 mhz machine.
 
twolazy said:
These deskpros have no L2 cache unlike the Prosignia series, and they are POD upgradable. Never tried it though. Keep it as a slow 486. If you need faster build a Pentium system as a brother. A Dx2/66 should be about as fast as a cached 33 or 40 mhz machine.
Click to expand...
Think it goes a little further than that. Almost all Compaq's that have the CPU on a card (M's/L's/Servers) or EISA slots are finicky about upgrading. A Deskpro M that I had wouldn't accept an upgrade chip either (but also had other issues).
 
I will investigate a bit more this topic and if I reach no conclusion I'll try to find a Pentium Overdrive to test...

I will keep you posted
 
You must log in or register to reply here.
Back
Top