FYI: Cyrix first product was 8087 math co-processor

[bondo]

I noticed you site today for the first time. Lots of good info. A few omissions and other misc missing info. I use to work for a major ATE vendor as an applications engineer. My first contact with small ($5 mill capitalization) private company named Cyrix in Dallas, TX in 1987, they were developing their first product math co-processor clone of the Intel 8087 math co-processor. They were the first company to clone the Intel 8087. I'll have to look around to see if I still have any marked engineering samples of the chip. I had a few with taped on lids.

[CPUShack]

That would be very interesting, I am working on a book about Cyrix, and was only aware of their 287s.

I am hoping to interview Gerald Rogers this year.

[gshv]

I've never heard of Cyrix 8087. If you have more information about them please share it with us. And, of course, it'd be very interesting if not to have, but at least to look at the chips.

Gennadiy

[morkork]

The only reference to a Cyrix 8087 I found is in an intro text for an article from Germany's most professional computer magazine c't. You have to pay to read it, though. Well, out of curiosity I bought it - but it was quite disappointing, there is no Cyrix 8087 mentioned, it's an article about FPUs in general with technical data and information about different 8087, 80287 and 80387 FPUs. But there was one single line about 8087 chips not from Intel. I will give you a translation:

"Nur selten dürfte man einen 8087-Prozessor finden, der nicht aus dem Hause Intel stammt, so beispielsweise von der hierzulande weitgehend unbekannten Firma Krueger Systems aus Arizona."

"There is a rare chance to see an 8087 processor not from Intel, for example made by Krueger Systems, Arizona - quite unknown in this country."

If anyone is interested in the complete article let me know. Don't forget, it's in German.

BTW, does anyone have a Krueger Systems 8087?

[Elar]

Only non-Intel 8087 that I know of is KM1810BM87, direct soviet rip-off of i8087.

[Qwerty]

Hi,

I think I know the reason why nobody has ever heard about Cyrix 8087.
I have read this some years ago. (I can't find this article now, but if I find it, I will post it here)

The Intel 8087 contained some major bugs. (The FLAGS \ SR register was incorrectly set after some operations)

Cyrix has corrected these "bugs" in their version of 8087. Therefore Cyrix 8087 was not compatible with Intel 8087 !
But all of software used 8087 was designed to use the incorrect behaviour of Intel 8087.

I think Cyrix has recalled all of them. That's why nobody has ever seen any Cyrix 8087.

[CPUShack]

could very well be.