The R4200 is a microprocessor designed by MIPS Technologies, Inc. (MTI) that implemented the MIPS III instruction set architecture (ISA). It was also known as the VRX during development. The microprocessor was licensed to NEC, and the company fabricated and marketed it as the VR4200. The first VR4200, an 80 MHz part, was introduced in 1993. A faster 100 MHz part became available in 1994. The R4200 was developed specifically for low-power Windows NT computers such as personal computers and laptops. MTI claimed the microprocessor's integer performance was greater than that of a high-end Intel i486 and 80% of a P5-variant Pentium microprocessor. The R4200 ultimately did not see any use in personal computers and was repositioned as an embedded microprocessor that competed with the R4600. The R