Category Archives: Cyrix

386 Cache Coherency

I’ve been slowly chewing my way through U.S. Patent 5,724,549, titled Cache Coherency without Bus Arbitration Signals, initially filed by Cyrix Corporation in 1992 and published in 1998 (when it was utterly irrelevant, but such is the life of patents). … Continue reading

Posted in 386, Cyrix, PC architecture, PC history | 17 Comments

A Piece of History

A few months ago I received a well-used but not abused copy of Rakesh K. Agarwal’s book 80×86 Architecture and Programming (Volume II): Architecture Reference, published by Prentice Hall in 1991. This is an unusually well-informed book, no doubt because … Continue reading

Posted in 386, Books, Cyrix, Intel, PC architecture, PC history | 6 Comments

What’s in a Name?

The following four processors are much more similar than one might think: 486 aficionados will recognize the processors made by IBM, ST Microelectronics, and Texas Instruments to be essentially one and the same model—Cyrix 486DX.

Posted in 486, Cyrix | 14 Comments