NEC rolled out the first model of the UP4800 UNIX server series, the UP4800/520, in April 1991. The 520 was powered by the RISC-based R3000 microprocessor produced by MIPS Computer Systems. Designed to be a core network system machine, the 520 provided database functionality, online transaction processing functionality, and printing functionality.

Features of the NEC UP4800/520:

(1) Featured the R3000 RISC processor, which performed computations at a remarkable 33 MIPS
(2) Included substantial amounts of onboard memory and magnetic disk capacity, and could be expanded to house as many as 110 phone lines
(3) Included enhanced operational controls, such as automated operational functions and remote operational functions
(4) Delivered high reliability through redundant operational functions that supported dual-CPU multicomputer systems
Construction of the UP4800/520
Model name UP4800/520
Processor R3000, 33 MHz
Floating-point unit R3010, 33 MHz
Main memory 64 MB - 320 MB
Primary cache Instruction: 64 KB, Data: 64 KB
Secondary cache 256 KB
Magnetic disk 662 MB - 31 GB

NEC UP4800/520