Later, Texas Instruments also released their own version of the chip, the TI486SXLC which featured 8KB internal cache vs 1KB in the original Cyrix design.

Introduced in May 1992, like the later and more famous Cyrix Cx5x86 it was a hybrid CPU, incorporating features of a new CPU (in this case the Intel 80486) while having a pin out similar to the existing 386SX, enabling existing board designs to be easily modified for the new chip.

Before even announcing the chip in March of 1992, Intel filed a lawsuit against Cyrix for patent infringement.

[8] Texas Instruments joined the suit shortly after with an intervene, siding with Cyrix.

[13] Cyrix used SGS-Thomson as a second manufacturer of the chip, as the company had license to use Intel's patents.

The lawsuit, which concluded in 1994, stated:Cyrix is entitled to judgment in its favor on its affirmative defenses of patent exhaustion and implied license based on the use or resale of its claim 1 microprocessors purchased from TI and ST.[15]