There is not much to say, it's a cyrix rebranded, usually ibm cpus were a little more overclockable compared to cyrix ones but that's the only difference.

6x86-2V212***are not listed in cpu pages about any of the IBM or Cyrix 6x86 cpus. Hence the reason for OP....

All my Cyrix chips were ibm branded and that one appears to be missing a line of text

I would fire it up on a super 7 board with a low voltage, multipler and bus and see if you can run any diagnostics, earlier chips didn’t have any cpuid but still worth a try.

Caluser2000 wrote on 2020-12-31, 23:29:

6x86-2V212***are not listed in cpu pages about any of the IBM or Cyrix 6x86 cpus. Hence the reason for OP....

I think yours is a IBM26 6x86-2V2120GB, like the one here: http://www.cpu-galerie.de/html/ibm6x86.html
and here: https://www.cpu-world.com/CPUs/6x86/IBM-6x86-2V2120GB.html

There is no indication at all the any text apart from the IBM26 line. Underneath it is perfectly clear.

Horun wrote on 2020-12-31, 23:43:

Caluser2000 wrote on 2020-12-31, 23:29:

6x86-2V212***are not listed in cpu pages about any of the IBM or Cyrix 6x86 cpus. Hence the reason for OP....

I think yours is a IBM26 6x86-2V2120GB, like the one here: http://www.cpu-galerie.de/html/ibm6x86.html
and here: https://www.cpu-world.com/CPUs/6x86/IBM-6x86-2V2120GB.html

AWESOME Horun. Thank you for looking for it.

The mobo has 64megs of ram of 4x16meg 72 pin FP simms. Fairly high for the time. I wonder what OS it was running?

Horun wrote on 2020-12-31, 23:43:

Caluser2000 wrote on 2020-12-31, 23:29:

6x86-2V212***are not listed in cpu pages about any of the IBM or Cyrix 6x86 cpus. Hence the reason for OP....

I think yours is a IBM26 6x86-2V2120GB, like the one here: http://www.cpu-galerie.de/html/ibm6x86.html
and here: https://www.cpu-world.com/CPUs/6x86/IBM-6x86-2V2120GB.html

That's the only part number which fits what we can see.

You may be able to verify that by checking the last number on the bottom, should be a ##H#### and compare to this list:
http://www.cpu-galerie.de/html/ibm5x86-fru.html
If there are no numbers on the bottom between the pins then that is as good a guess as I can make 😀

Cyrix was fabless. During the early days of 6x86, all of their chips were produced by IBM and ST *for* Cyrix, not the other way around. As part of the deal, IBM and ST were allowed to sell the Cyrix chips under their own name.

What you have is a very early example of an IBM branded 6x86 that pre-dates the P or PR system. This chip should be pretty much identical to a P150+

I really liked the look of these earlier specimens. In my opinion when they switched to the MS-comic font, it really gave it a cheap look.

Under the chip is:

COPYRIGHT USA
1995 CYRIX
IBM9314 Q14039
75H1233 QH

Thanks everyone who supplied useful info. 😉

Cannot tell what OS it would have been running, maybe OS2 2.1 or maybe upgraded to Win95, both can handle 64Mb.
I do not find many references to MSI P54C TR6 (MS-5137 ?) from a quick search and it is missing from TH99 if I got the MS# correct .
Can you take a good picture of the motherboard ? and maybe save the BIOS ?
Should be a Intel 82437VX based (if my quick search is good) and a good board but there is very little info on it.

Here you go...

Anonymous Coward wrote on 2021-01-01, 00:24:

Cyrix was fabless.

Interesting point that got me thinking.
From today's point of view and through the prism of time - yes, that is true.
But back in the day nobody was bragging about getting a new Cyrix cpu.
Or were they ? Certainly not in the space I had visibility into.
Wonder if perception was different elsewhere ?

I think at the time at the same clock speed 6x86s were faster than Pentiums. The FPU performance was no were near as good though.

The DLC range was fairly popular for those with 386DX mobos. 5x86 upgade packages with interposer from the likes of Kingston and Hypertec were useful for your 486. These had AMD or Cyrix cpus.

6x86 CPU’s were pretty exciting at first from a price performace ratio. But the extra heat and early compatability issues put a damper on things pretty quickly. And it didn’tplay quake very well either, which wasn’t so awesome.

I always though the last generation of the M2 packaging had sophisticated aesthetic .

I always though the last generation of the M2 packaging had sophisticated aesthetic .

On the contrary. It's simplified design, with heatspreader just crudely glued directly on FCBGA style crystal with no additional support.

The Serpent Rider wrote on 2021-01-01, 13:55:

I always though the last generation of the M2 packaging had sophisticated aesthetic .

On the contrary. It's simplified design, with heatspreader just crudely glued directly on FCBGA style crystal with no additional support.

There are lots of different sources of nostalgia and aspiration that serve as the lenses through which we view and value computer history.

douglar wrote on 2021-01-01, 13:44:

6x86 CPU’s were pretty exciting at first from a price performace ratio. But the extra heat and early compatability issues put a […]
Show full quote

6x86 CPU’s were pretty exciting at first from a price performace ratio. But the extra heat and early compatability issues put a damper on things pretty quickly. And it didn’tplay quake very well either, which wasn’t so awesome.

I always though the last generation of the M2 packaging had sophisticated aesthetic .

Awesome looking.