Is this burst module compatible with the m919 ?

IMO no pentium cache chip is compatible with 486 architecture. Pentium burst cache is synchronous. 486 cache is asynchronous (I think except one ultrarare chipset vendor, which stated pipeline burst support in the future, but IMO was never developed 😁)

pc2005 wrote on 2026-05-19, 01:36:

IMO no pentium cache chip is compatible with 486 architecture. Pentium burst cache is synchronous. 486 cache is asynchronous (I think except one ultrarare chipset vendor, which stated pipeline burst support in the future, but IMO was never developed 😁)

Do you think PC Chips used the COAST-like slot so that it would visually appear closer to a Pentium board?

Definitely 😁

Also if the slot is the same (pin count) part as in Pentium, it would be cost efficient.

pc2005 wrote on 2026-05-19, 01:50:

Definitely 😁

Also if the slot is the same (pin count) part as in Pentium, it would be cost efficient.

Re-using slot components happened a few times. IIRC the Microchannel socket (the physical socket, not the electrical arrangement) got re-used for Vesa Local Bus. The Athlon slot socket was the same as the Intel slot, just rotated 180 degrees (and of course electically incompatible). Cyrix’s PGA MediaGX socket is Socket 7 with completely different pinout.

It was apparently common to use already-made physical hardware in new ways to save costs.

Still goes on I guess, USB 3.0 cables are used for PCIe risers.

gbeirn wrote on 2018-08-14, 17:40:

I am massively cleaning out my collection and going through my pile of stuff to repair I came across a PC-Chips M919 motherboard […]
Show full quote

I am massively cleaning out my collection and going through my pile of stuff to repair I came across a PC-Chips M919 motherboard. ZIF socket was missing so I soldered on a new LIF socket and it worked just fine. This allowed me to test my 2 cache modules I have for the board, one works great, the other causes lockups and hard drive corruption. Since I can fine the SRAMs I desoldered all the bad ones in anticipation of ordering some replacement SRAMs to get this stick working since they are so hard to come by.

Anyways after looking at it for a bit and remembering how people on here are making custom PCBs, I took some pictures and measurements in case someone wants to have these manufactured. I might get to it one day but right now I have other pressing matters so I'll upload what I have and if anyone wants to have a go at it, feel free.

I think it would be pretty simple, doesn't have multiple layers.

Album is here: https://imgur.com/a/xmKIZ9p

Greetings Gbeirn,

I am glad you started this thread, and am surprised to find someone which has the same M919-02S5 that I am attempting to work with. When inserted into the system, the POST Code analyzer gets to code ED with the floppy and then at EE beeps continuously as the floppy keeps seeking over and over again (start/stop/start/stop etc). It does this with L2 in bios enabled or disabled. I've read through this thread, and will most likely attempt to repair this if I can find the IC's (they are still hard to find unless removed from other memory devices) or build a homebrew one manufactured if no one has any available for purchase.

This module was received from a person who had it stored in a closet for a long time. I haven't tested any components, yet. From the contact traces left from insertion and removal, looks like the Cache slot is okay.

This thread is quite the treasure trove of information.

-Berzerkula