Posting in a thread... Just in case more become available. ^.^

Also interested in 1x 1024kb M919 cache stick when they are available.

edit: looking at ordering and building a board based on info below:

https://github.com/pancakepuppy/M919_3.3V_1MB_cachestick

Before the pandemic i have checked that if you built 10 of them it will be ~50-60 $ each.
Maybe the price have rise since...
I'm sure some peoples out there wants cache stick too but don't know this topic/site

I am a proud new owner of a vendor sealed fingerprint free M919 motherboard, complete with the fake cache chips on board.

The board It came with a 256KB async stick, but I'd be interested in a 1024KB async stick if they are available.

I'm assuming that the Pipe Burst SDRAM cache sticks were never delivered by the vendor. Is that true?

I don't think the chipset supports PB srams, but ofc I might be completely mistaken.

Am386DX-40 wrote on 2023-02-22, 20:22:

I don't think the chipset supports PB srams, but ofc I might be completely mistaken.

So what I hear you saying that the company that soldered fake SDRAM cache chips on a motherboard may have also falsely promised to build PB-SDRAM cache modules for a chipset that could not support a PB-SDRAM cache ?

Hmm.

I guess that checks out.

The two (128-pin) chips that are onboard on some of these boards look like SDRAM, have "write back" written on top but are neither SDRAMS nor write back, but plastic dummies.

All existing cache sticks for the M919 have _SRAM_ chips, so there´s no synchronous operation possible and there is probably no Pipeline Burst mode that would need a DRAM controller (as far as I remember...).

It´s all fake to the core.

The 1MB cache stick works great, even with the fastest timings at 40 Mhz.

Doom changes from 1276 realtics to 1239 with the larger stick, so there is a measurable, but not exactly noticeable improvement over 256KB.

Quake changes from 16.8 to 17.8 FPS. That's noticeable, and a 6% increase is about the best I could expect, yes?

douglar wrote on 2023-02-27, 00:49:

The 1MB cache stick works great, even with the fastest timings at 40 Mhz.

Doom changes from 1276 realtics to 1239 with the larger stick, so there is a measurable, but not exactly noticeable improvement over 256KB.

Quake changes from 16.8 to 17.8 FPS. That's noticeable, and a 6% increase is about the best I could expect, yes?

5-10% on heavier applications is normal. The less memory intensive the task is, the less difference you'll see between 256K and 1M.

Are any of these available again for purchase? I need just one. It can even be the 256KB variant. I've been a lurker here on the site for ages, but I recently bought an M919 board without knowing (of course) that the cache was fake OR that the slot was proprietary. Hoping to find a cache module here! Mine at least is the newer revision without the fake plastic chips.

Hello, to my knowledge there isn't available anymore.
But Pancakepuppy have made the design freely available.
It take 6-8 pieces to be reasonably priced.
You should count yourself (already 4 on this page), if there is enough people i can order all the material and PCB to make these.
Be aware it could take two or three months to be ready.

Efflixi86Box wrote on 2023-08-01, 10:57:

Are any of these available again for purchase? I need just one. It can even be the 256KB variant. I've been a lurker here on the site for ages, but I recently bought an M919 board without knowing (of course) that the cache was fake OR that the slot was proprietary. Hoping to find a cache module here! Mine at least is the newer revision without the fake plastic chips.

You might not need one really, see... 486 board with UMC 8881E/8886B: The winner is: EDO without L2 (if your only other option is L2 at 3-2-2-2)&

BitWrangler wrote on 2023-08-01, 14:20:

Efflixi86Box wrote on 2023-08-01, 10:57:

Are any of these available again for purchase? I need just one. It can even be the 256KB variant. I've been a lurker here on the site for ages, but I recently bought an M919 board without knowing (of course) that the cache was fake OR that the slot was proprietary. Hoping to find a cache module here! Mine at least is the newer revision without the fake plastic chips.

You might not need one really, see... 486 board with UMC 8881E/8886B: The winner is: EDO without L2 (if your only other option is L2 at 3-2-2-2)&

Those guys are doing huge amounts of changes to their boards. I have no tools anymore or the time to do so despite having the skill. (I used to work on micro-electronics like audio amps and circuits) I'd like the board to be as capable as possible without a lot of hard tinkering. I don't mind changing around BIOS settings as needed but my intention is to be able to swap out CF based drives on this board to run various early/mid 90's OS's and games and compare directly against the 86Box emulator project that I'm part of to get tons of hard data about accuracy.

I don't mind funding someone to get a stack of cache modules made. I just can't make them myself currently. In fact, ideally, what I'd like to end up with is a couple modules of various sizes for the M919 and various sizes in the "normal" COAST format as well so I can test those in other 486 boards.

crazytiti wrote on 2023-08-01, 11:59:

Hello, to my knowledge there isn't available anymore. But Pancakepuppy have made the design freely available. It take 6-8 pieces […]
Show full quote

Hello, to my knowledge there isn't available anymore.
But Pancakepuppy have made the design freely available.
It take 6-8 pieces to be reasonably priced.
You should count yourself (already 4 on this page), if there is enough people i can order all the material and PCB to make these.
Be aware it could take two or three months to be ready.

I did another run of them and have been directly messaging people who ask about them. I have a few of the 1MB 3.3V modules at hand. I'll edit this post when they're gone to say so.
Thanks everyone 😀

I would be interested for a 1MB module too
I actually made a TSOP-II version of https://github.com/pancakepuppy/M919_3.3V_1MB_cachestick but did not order yet.

pancakepuppy wrote on 2023-08-02, 23:41:

crazytiti wrote on 2023-08-01, 11:59:

Hello, to my knowledge there isn't available anymore. But Pancakepuppy have made the design freely available. It take 6-8 pieces […]
Show full quote

Hello, to my knowledge there isn't available anymore.
But Pancakepuppy have made the design freely available.
It take 6-8 pieces to be reasonably priced.
You should count yourself (already 4 on this page), if there is enough people i can order all the material and PCB to make these.
Be aware it could take two or three months to be ready.

I did another run of them and have been directly messaging people who ask about them. I have a few of the 1MB 3.3V modules at hand. I'll edit this post when they're gone to say so.
Thanks everyone 😀

Thank you so much! They arrived and the 1MB module is proving to add as much as 30% performance to the AMD 5x86 133!

Was wondering if I could commission someone to build a proprietary ram expansion board for a 386?

board model?

@pancakepuppy I'm interested in a 1MB 3.3V module if you still have some (I can't seem to PM still). Let me know!

Edit: based on your eBay listing they might be sold out

pancakepuppy wrote on 2023-08-02, 23:41:

crazytiti wrote on 2023-08-01, 11:59:

Hello, to my knowledge there isn't available anymore. But Pancakepuppy have made the design freely available. It take 6-8 pieces […]
Show full quote

Hello, to my knowledge there isn't available anymore.
But Pancakepuppy have made the design freely available.
It take 6-8 pieces to be reasonably priced.
You should count yourself (already 4 on this page), if there is enough people i can order all the material and PCB to make these.
Be aware it could take two or three months to be ready.

I did another run of them and have been directly messaging people who ask about them. I have a few of the 1MB 3.3V modules at hand. I'll edit this post when they're gone to say so.
Thanks everyone 😀

Dear Pancakepuppy, do you have any 1MB or 256KB cache modules for sale?