Cyrix Corporation was a microprocessor developer that was founded in 1988 in Richardson, Texas, as a specialist supplier of floating point units for 286 and 386 microprocessors. The company was founded by Tom Brightman and Jerry Rogers.

Jul 4, 2024 · This made it possible to pair an AMD 386 CPU with a Cyrix FastMath co-processor and get 486-like performance at a lower price.

Apr 28, 2021 · In 1993, Cyrix also released an upgrade processor that plugged into a 386 socket, providing a clock-doubled 486-compatible CPU. While a 386 upgraded with one of Cyrix’s upgrade chips had limitations, it did bring aging 386 systems into 486-class territory.

Apr 8, 2020 · When Cyrix designed the 486DLC upgrade processors for the 386 socket, it was not a problem to put 1K of internal cache on a 386-socket chip, or later even 8K in the case of Texas Instruments 486SXL processors. But keeping the cache coherent was a problem.

Aug 6, 2015 · I installed a Cyrix 486DRx2 in my Compaq 386/20e. It also has an external cache controller and no issues running Windows 95, Windows NT, and Linux. However, most of the fancy features of the CPU won't be enabled (including cache) until a utility is run to set them.

Nov 13, 2015 · The CPUs that fit into a 386 socket are well known: Intel’s original, AMD’s exact copy, and Cyrix/TI upgrades. There is also IBM’s 386SLC which is close to a 386 but can’t be plugged into a standard 386 socket.

Jun 15, 2015 · Got my hands on a Cyrix 386SX to 486 snap-on CPU upgrade. I installed the Cyrix CPU- its a snap on over the soldered 386sx and installed with a snap (excuse the pun). I restarted the computer and it booted fine, though I hadn't yet installed the Cyrix 486 cache SW.

Aug 4, 2016 · The DLC-40 created by Cyrix was intended to be a drop in upgrade CPU for 32 bit 386 class motherboards which in essence gave 386 PC users a 486 CPU upgrade. It essentially is a supped up 386 with 486 code inserted and 1kb of L1 cache added on the chip.

Jan 5, 2001 · Forming from a small number of former Texas Instruments employees in 1988, Cyrix originally did not produce CPUs at all, but rather math coprocessors for 286 and 386 systems. A slow progression...

Cyrix's first CPU is a hybrid design of 386 and 486. It was 386 bus compatible with 1kb internal cache and support for i486 instructions. The 486xLC is an original design that does not use any Intel microcode. Performance was about 85% of a 486SX.