They're all.... So beautiful....

While waiting for parts I finally had time to test the 3.3v modification, it seems to be working well. Compaq simply never added these parts to the motherboard, but the PCB layout is made in such a way that it supports auto CPU detection (auto-switching between 3.3v or 5v). Information for doing this mod can be found here.

I'm now running an AMD 133Mhz in write-back mode (motherboard supports this!) which gives me the following results:

Great work!

sander wrote on 2025-02-16, 10:54:

While waiting for parts I finally had time to test the 3.3v modification, it seems to be working well. Compaq simply never added […]
Show full quote

While waiting for parts I finally had time to test the 3.3v modification, it seems to be working well. Compaq simply never added these parts to the motherboard, but the PCB layout is made in such a way that it supports auto CPU detection (auto-switching between 3.3v or 5v). Information for doing this mod can be found here.

The attachment IMG_20250216_114154.jpg is no longer available

I'm now running an AMD 133Mhz in write-back mode (motherboard supports this!) which gives me the following results:

The attachment IMG_20250216_114315.jpg is no longer available

The attachment IMG_20250216_114146.jpg is no longer available

hach, this is my github site.

great works
you have confirmed, my guide works 😀

Beside, a quesition.
Gerber file in your github site is final, working ?

https://github.com/wichers/Compaq-Cache-Modul … =readme-ov-file

Madao wrote on 2025-02-16, 15:30:

hach, this is my github site. […]
Show full quote

hach, this is my github site.

great works
you have confirmed, my guide works 😀

Beside, a quesition.
Gerber file in your github site is final, working ?

https://github.com/wichers/Compaq-Cache-Modul … =readme-ov-file

Thank you for your work! Gerber is not final, I still need some time to upload it and document last changes.

I would like to say I'm done, but again I didn't order enough capacitors to finish all 10. Darn it ;-( Well, at least 5 are finished and are looking/working great. The dip switch works excellent as well, and of course all modules are tested in 1MB configuration but will work just fine ('ve tested this too) in 256Kb mode. Again, as this project has been a labor of love I will not be charging anything extra (donations are welcome though 😉). You pay for shipping and payment can be done using paypal friends, I've created a google form so we don't have to fill this forum with garbage. After you filled the form I will contact you by email, so you have my details as well.

edit: PCBs are in ENIG Gold and the gold plated columns along the edges are in 2U gold, (the thickest I could get), parts are from Mouser, except for the switches these are from LCSC.

Oh they are pretty... I get paid again not this week but the next and will be using your form to order mine... Thank you thank you thank you.. this is gonna be so awesome. I'm sorry I couldn't check back sooner, but if they have all sold.. I will wait til you get enough caps to finish the other 5.

Your so awesome sander....

baronvonkaiser wrote on 2025-03-08, 23:26:

Oh they are pretty...

No problem, I'll contact you shortly!

After my 3.3v modification, I finally managed to have a look at the FSB as suggested by @lazibayer in 2014 😉. With a small modification (lifting leg 20 of the AV9155-03 and soldering this lifted pin to leg 18) I now have the machine running at the maximum of 50Mhz FSB (clock is X2 and maximum supported output by the AV9155-03 clock generator is 100 Mhz). I've also soldered in the 'missing' 72pin memory slot and with some bios modification and disabling the output enable on the onboard 4MB and tying it's RAS line to the missing slot. I now have the maximum of 128MB. I have one thing left on my todo and that is to see if I can enable interleaving on the RAM, this should make the RAM considerably faster.. btw. modifying the Compaq BIOS is a pain, the assembly is such a mess!

This gives the following results:

Doom @59.66 FPS
Quake @16.9 FPS
Landmark @713 and 1134 Mhz with 21845 chr/ms.
3DBench @88.9
Chris's 3D Benchmark @20.7 FPS

I'm unable to enable memory interleaving, I haven't given up though. I'm currently using 4x32MB EDO and I will do more tests with 4MB FPM to see if that makes a difference.

In the meanwhile I tested an option to enable slow refresh, asynchronous refresh and CAS before RAS. (utility attached) This will squeeze a bit more out of my current setup. Note that the AMD @ 150 Mhz isn't hot to the touch at all.

[edit]Looking at other benchmarks this is a very decent result for a 3x50 Mhz setup.[/edit]

@sander: stunning boards! from your initial research to the actual manifestation, this project is more than impressive!

Update: I just received a specimen - that's hardware pr0n right there!!

Results without cache memory:

Results with Sander's module configured to 256k:

PC-Info

Hi Sander,
I'm not entirely sure if you were the user who wrote to me on "Kleinanzeigen". I've been looking for the cache module there for a long time. Someone (maybe you) wrote to me there and suggested to follow this Vogons thread. Unfortunately, messages on Kleinanzeigenare automatically deleted, and I lost track of it. Today I remembered it again, and what can I say? The project is a complete success.
Is it still possible to order one of the modules?

Dosler wrote on 2025-04-01, 17:14:

Hi Sander,
I'm not entirely sure if you were the user who wrote to me on "Kleinanzeigen". I've been looking for the cache module there for a long time. Someone (maybe you) wrote to me there and suggested to follow this Vogons thread. Unfortunately, messages on Kleinanzeigenare automatically deleted, and I lost track of it. Today I remembered it again, and what can I say? The project is a complete success.
Is it still possible to order one of the modules?

Yes, of course. Please use the following form.

Geoman wrote on 2025-03-23, 19:20:

PC-Info

I wish I had a 486dx4 or a spare Kingston/evergreen/cyrix etc... to send you. I am gonna do a full range from a 486dx 33, sx2 66, dx2 50, 66 and 80, d4 100, and the dx5s from ti/cyrix and the lot(well all I've acquired along the way with my gold and ancient cpus) I have. I just wish I had the ability to record it and document it like LGR or adriansDB would do it..

But it's still a dream, and when I get my finger out and get sander my bios dump... I can get it and hold a manifestation by a genius... Enjoy this all friends, it's a baby step into an awesome future for all of us that enjoy home tinkering with ancient and modern tech.. this is history, in a small way...

Perhaps I'm going to try out a DX4/100. Though I find the PC as it is at the moment (486 DX2/66) extremely fast. The fastest 486 I own.

Hi everyone,
the cachemodul arrived in germany and after some starting problems my Prolinea 4/33S now have the 256kb cache. The 486 SX-33 dont become Speedy Gonzales (we all know SX stand for "sux"), but its nice to have and thus a future CPU upgrade makes even more sense. Big Thanks to Sander and the comunity for the amazing work. Sander points me to this thread via a german site like craiglist, so special kudos for that.
Doom went from 14.06 FPS to 14.96 FPS
Here some pics before and after.

Just received the module to my mailbox and it is a thing of beaty. So big thanks to @sander for all the great work!

I’m planning to make other changes to my Prolinea 4/50@66 (it uses 164560-001 MB too) and I will slap this in while doing so.

It would be terrific if someone could just come up with a similar reproduction for Deskpro XE series. They of course use different module from these computers with Sony CXK784862Q-33 single chip cache solution, which makes things much more complex. Otherwise Deskpro XE 486 series are terrific computers with fast QVision VLB graphics and with onboard WSS sound. My system has 100MHz ODPR CPU in it and it just screams for some L2 as the performance is certainly hampered by the lack of it.