Re: Upgrading the Oscillator of a Compaq Deskpro 50M (486 DX2/50) processor board ?

Posted on 2023-08-17, 06:24

by

by NightShadowPT

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Where are you located NightShadowPT? I have some spare 33Mhz boards and I might send you one from germany? I'm living in the UAE, but I have a forwarding address I can use in Germany. To be clear, I currently have a working board running a 486 DX2/66, but it is one of the boards without L2 cache ( …

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Re: Upgrading the Oscillator of a Compaq Deskpro 50M (486 DX2/50) processor board ?

Posted on 2023-08-14, 18:40

by

by NightShadowPT

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well, it's done... but unfortunately the mod has failed. I changed the oscillator on the board, but ended up with graphical corruption (but I could make out the computer was doing the memory test, and passed it). Unfortunately, this seems to mess up the system somehow, so maybe just changing the …

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Re: Compaq DeskPro M series - Mega Thread - Call for community support

Posted on 2023-08-10, 06:20

by

by NightShadowPT

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Added a video with a recuperation of a Deskpro 386/25M machine.

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Re: Upgrading the Oscillator of a Compaq Deskpro 50M (486 DX2/50) processor board ?

Posted on 2023-08-10, 05:47

by

by NightShadowPT

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Presumably this... 50M Weitek.jpg Thanks, that clarifies it. Now for the million dollar question. I understand why you would want a 387 for a 386 processor... I know their uses are limited, but they exist, but if the 486DX already included an FPU, why would anyone need a 387 for? If you are a …

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Re: Upgrading the Oscillator of a Compaq Deskpro 50M (486 DX2/50) processor board ?

Posted on 2023-08-09, 06:05

by

by NightShadowPT

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks for the tips... I'll let you know how the adventure progresses as soon as I receive the oscillators and try my soldering skills :) By the way, if you look at the board on the first post, you can see there is an empty slot for what looks like a Mathematical Co-Processor, but in this case it …

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Re: My DIY sound card replicas

Posted on 2023-08-08, 11:31

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by NightShadowPT

in Marvin \ Sound

in Marvin \ Sound

I'd like to get a parallel port sound card to use with a couple of thin clients that I have. I've also read that you can use a TSR (Temu) to get Tandy sound as well with a Covox. Am I correct in assuming that this would also work with this device? Hi, I recently got a CVX-4 (Covox clone) and it …

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Re: In search for max sound compatibility :)

Posted on 2023-08-08, 11:10

by

by NightShadowPT

in Marvin \ Sound

in Marvin \ Sound

Just to update you on this topic, I ended up getting a Cvx-4 to complement my options (and give some use to my parallel port :)). I have to say the sound quality is quite impressive, much better than I expected (for the games that have support for the Covox). But truth is that most, if not all of …

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Re: Upgrading the Oscillator of a Compaq Deskpro 50M (486 DX2/50) processor board ?

Posted on 2023-08-07, 16:21

by

by NightShadowPT

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

By the way, in case someone is interested, I ran some tests on both configurations (the 486DX2 66 without cache vs 486DX2 50 with cache) ____________|__ 486DX2 66*_|__486DX2 50** -----------------|---------------|---------- 3D bench_______|____37.0____|____34.4____(DX2/66 is 7.6% faster) Chris 3D …

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Re: Upgrading the Oscillator of a Compaq Deskpro 50M (486 DX2/50) processor board ?

Posted on 2023-08-07, 15:44

by

by NightShadowPT

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Bought both, just in case (they were 2$ each...) 😀 For the installation, do I just need to respect the "notch" orientation, solder, change the CPU and call it a day?

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Re: Upgrading the Oscillator of a Compaq Deskpro 50M (486 DX2/50) processor board ?

Posted on 2023-08-05, 20:23

by

by NightShadowPT

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The board indeed supports either type of crystal oscillator since there is continuity between those holes and pads. You'll have to make a decision of whether you want to use a SMD one or Through-Hole one. In all honesty, I have no ideia what is the difference (or even if there is any). What are the …

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Re: Upgrading the Oscillator of a Compaq Deskpro 50M (486 DX2/50) processor board ?

Posted on 2023-08-05, 15:16

by

by NightShadowPT

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

EDIT: Though from the picture I can see there seems to be provisions for a trough-hole crystal oscillator too. Would need to beep with a multimeter to make sure those are connected to the SMD crystal oscillators pins. Hi, I've tested continuity and there is continuity between there (kindly see …

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Upgrading the Oscillator of a Compaq Deskpro 50M (486 DX2/50) processor board ?

Posted on 2023-08-05, 08:06

by

by NightShadowPT

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi, On a separate thread, I learned that it would be possible to upgrade the Compaq Deskpro 50M processor board to the 66M (moving from a 486 DX2 50 to a 486 DX2 66), just by changing the oscillator and the processor. I have procured the 50M board and I'm willing to give it a try, but would like to …

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Re: Compaq Deskpro 486/66M - struggling to install maximum RAM capacity

Posted on 2023-08-05, 07:09

by

by NightShadowPT

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I remember having problems during configuration while a HDD was attached. Try to detach the HDD and run configuration from diskettes, attach HDD again after successful configuration. THAT WAS IT!! I have disconnected the drive, was able to install the ram without any problems. Wow... this was a …

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Re: Compaq DeskPro M series - Mega Thread - Call for community support

Posted on 2023-08-04, 15:24

by

by NightShadowPT

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here are two more historic threads on here that I had in my saved list: https://www.vogons.org/viewtopic.php?f=46&t=93495 This one details the power supply recap procedure. These Nippon Chemicon SXF caps they used are known to leak. https://www.vogons.org/viewtopic.php?f=46&t=73427 General …

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Re: CRT experience

Posted on 2023-08-02, 14:18

by

by NightShadowPT

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I love CRT's because of the deep blacks, the blurriness from the mask and how it looks in motion. I have my fare share of them. But they are bulky, fragile and bound to fail at some point. I am of the opinion that technology has evolved to the point that you can have 99.99% of the CRT experience …

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Re: Compaq DeskPro M series - Mega Thread - Call for community support

Posted on 2023-08-02, 08:18

by

by NightShadowPT

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

- Updated the first post to better reflect the purpose of this thread. - Added an 11 minute promotional video from Compaq highlighting the design process of the DeskPro/M and the Inteligent Modularity concept.

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Re: Compaq Deskpro M series - Documentation/Manuals

Posted on 2023-07-30, 16:16

by

by NightShadowPT

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm sorry I couldn't help you more, here is some info too, but unfortunately no manual: https://www.1000bit.it/js/web/viewer.html?file=%2Fad%2Fbro%2Fcompaq%2Fcompaqdeskprom%2Dfamily%2Epdf#zoom=page-fit (more product sheets on website: https://www.1000bit.it/ad/bro/brochures.asp?id=11, at bottom of …

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Re: Compaq Deskpro M series - Documentation/Manuals

Posted on 2023-07-30, 08:54

by

by NightShadowPT

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I dont know, if there is M series too, but some info has one of our members here: https://minuszerodegrees.net/manuals/Compaq/Compaq%20DeskPro%20386%20-%20Maintenance%20and%20Service%20Guide.pdf Another docs possible here: https://www.pcjs.org/machines/pcx86/compaq/deskpro386/ and here: https:// …

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Compaq DeskPro M series - Mega Thread - Call for community support

Posted on 2023-07-30, 07:41

by

by NightShadowPT

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi, I started this thread in search of a manual for the Compaq Deskpro/M series, but it has since grown into a mega threat about this Compaq model launched in 1991 with "Intelligent Modularity". It covers processors from the 386/25 to the Pentium/66 (I have attached a photo of my system below for …

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Re: Graphics card - Compaq QVision 1280/E - What is that expansion connector for?

Posted on 2023-07-30, 06:47

by

by NightShadowPT

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

PC Hoarder Patrol wrote on 2023-07-29, 11:13: VESA connector CPQ 1280E VESA.jpg Thanks for the quick answer! Also, cool to see it directly from the manual 😀 Had no idea these cards had this kind of interface... I don't think I'll have a use for it, but cool to know anyway. Cheers!

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