https://theretroweb.com/motherboards/s/cache- … 386sx-model-345

Almost same layout, a very similar model at least.

Looks like an Alaris board of some kind..

Rwolf wrote on 2024-02-13, 15:56:

https://theretroweb.com/motherboards/s/cache- … 386sx-model-345

Great find. Sticker on OPs board chipset says CACHE Computers, model on the side states ASSY 81403, over that 81404, bios identifies as Cache Computers 80403. This makes it Model 403 or 404. Highest model in theretroweb is 348, so would be nice it this board was uploaded there.
Its definitely 16bit bus like model-345.

BIOS also says SXSLC, could it have the IBM 486SLC?

Maybe, though that was a low-power CPU I think? The CPU on the board has a pretty hefty cooler for that. Maybe I'm wrong.

Thanks for your help,
From your replies and observations of the motherboard, I believe it is a variant of the Cache Computer MINI 386SX (Model 345), perhaps made for IBM, and by looking at the 50 MHz motherboard crystal and CPU pin count, I believe this It's a 386SX-25, which makes me hesitant, I was expecting to get a 386DX-40.

Nooo, that's a 486 SLC, a 16-bit version of the IBM Blue Lightning CPU. I've got a mainboard with the 32-bit version 486DLC from some ambra LPX computer and it's got the same heatsink.
You can tell it's 16-bit because of the PLCC co-processor socket.
Another clue in the BIOS string: "30-0100-006305-10101111-121291-OPSXSLC-F"

The name 'Cache Computers' seems a little ironic but the 486SLC should have 1KB or 8KB of cache on the processor which makes it far quicker than a 386SX. You should run speedsys on that computer to see if the first 1KB/8KB/16KB memory accesses are much quicker.
Check around the BIOS options too, my 486DLC has options to select 2x or 3x multiplier. Given the 50MHz crystal for 25MHz bus speed, having the chip run at 50 or perhaps 75mhz (less likely) would make sense.

Edit: Actually, please run some kind of CPU ID utility maybe from Dosbench. I really can't tell what CPU is there from the pin1 notch and the package shape...

Thermalwrong wrote on 2024-02-14, 03:01:

Nooo, that's a 486 SLC, a 16-bit version of the IBM Blue Lightning CPU. I've got a mainboard with the 32-bit version 486DLC from […]
Show full quote

Nooo, that's a 486 SLC, a 16-bit version of the IBM Blue Lightning CPU. I've got a mainboard with the 32-bit version 486DLC from some ambra LPX computer and it's got the same heatsink.
You can tell it's 16-bit because of the PLCC co-processor socket.
Another clue in the BIOS string: "30-0100-006305-10101111-121291-OPSXSLC-F"

The name 'Cache Computers' seems a little ironic but the 486SLC should have 1KB or 8KB of cache on the processor which makes it far quicker than a 386SX. You should run speedsys on that computer to see if the first 1KB/8KB/16KB memory accesses are much quicker.
Check around the BIOS options too, my 486DLC has options to select 2x or 3x multiplier. Given the 50MHz crystal for 25MHz bus speed, having the chip run at 50 or perhaps 75mhz (less likely) would make sense.

Edit: Actually, please run some kind of CPU ID utility maybe from Dosbench. I really can't tell what CPU is there from the pin1 notch and the package shape...

You're right, as you can see from the picture, the CPU has 100 pins, so it can't be a 486DLC, and considering the words OPSXSLC in the POST string, there's a good chance it's a 386SX or 486SLC or 486SLC2?

I've paid for it and everything will be revealed once I get it.

CPU is 100% an IBM 486SLC judging by the "IBM" and "486" motherboard labels.

https://en.wikipedia.org/wiki/IBM_386SLC#IBM_486SLC

Double the L1 cache compared to other 486 upgrade CPUs (TI, Cyrix)

If it's an "SLC2" then the clock is doubled as well. Without clock doubling it's still at a miniumum 2x faster than the standard 386sx CPU.

MikeSG wrote on 2024-02-14, 07:39:

CPU is 100% an IBM 486SLC judging by the "IBM" and "486" motherboard labels. […]
Show full quote

CPU is 100% an IBM 486SLC judging by the "IBM" and "486" motherboard labels.

https://en.wikipedia.org/wiki/IBM_386SLC#IBM_486SLC

Double the L1 cache compared to other 486 upgrade CPUs (TI, Cyrix)

If it's an "SLC2" then the clock is doubled as well. Without clock doubling it's still at a miniumum 2x faster than the standard 386sx CPU.

I got the motherboard and tested it, it has a 386SLC processor installed, it has 8KB L1 Cache, the processor generates a lot of heat, and my fingers can't put it on the heatsink for a long time.

That's a neat little system. Not too often you see a 386SLC!

I also have that ibm 386SLC motherboard its pretty fast. I tried the CPU in L2 cache + VLB environment at 30MHz:

https://www.youtube.com/watch?v=5RKnboo1qXA&t=39s