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MIPS Rx000 class ICs
MIPS Rx000 information

MIPS (Microprocessor without interlocked pipeline stages) is a RISC microprocessor architecture developed by MIPS Computer Systems Inc in the early eighties. MIPS processors were used in high-end servers from Siemens and DEC and especially in SGI's computer product line, and have found broad application in embedded systems, Windows CE devices, and Cisco routers. The Nintendo 64 and Sony PlayStation 2 consoles also use MIPS processors. The architecture was very successful, about one third of all RISC chips produced in mid 1990s were MIPS based designs. In 1999 the ARM/StrongARM architecture took over rather decisively in thanks to cell phone and PDA usage.

The MIPS design is licensed to many 3rd party vendors, among them IDT, Siemens, NEC, HP and Toshiba. It is one of the most popular licensed architectures. This is not because the MIPS architecture is particularly good in a specific task. It isn't. MIPS is just a convenient, clean, and easily scaled architecture around which special-purpose network processors or protocol engines can be added. It is one of the cleanest and most generic processor designs around, finely tuned for absolutely nothing.
 
References:
 MIPS architecture at Wikipedia
 Number one RISC architecture (1997)
 MIPS architecture documentation
 MIPS R series tech docs
 Comprehensive SGI information at SGIstuff
  add/correct MIPS Rx000 info  
46 MIPS Rx000 chips in collection: show thumbnails
 IDT
  R3000
   79R3000A-12G
  R3010 FPU
   79R3010A-12QJ
   79R3010L-33G
  R3020 MB
   79R3020-20G
   79R3020-33G
  R3500
   79R3500-33G
  R4400
   79R4400MC-50G447
  R4600
   79R4600-100G
   79R4600-133G
   79R4600-133G 'Orion'
  R4700
   R4700 79RV4700-100G 'Orion'
   R4700 79RV4700-133G
  R5000
   R5000 79RV5000-150G
 LSI Logic
  R3000 RWB
   R3000 RWB LR3220GC-25
 NEC
  VR3000
   D30310R-33 VR3000A-33
  VR3010 FPU
   D30311R-33 VR3010A-33
   D30311R-40 VR3010A-40
  VR4000
   D30401RJ-50 VR4000SC-50
  VR4300
   D30200GD-100 VR4300
  VR4400
   D30412RJ-50 VR4400MC
   D30412RJ-75 VR4400MC
   D30412LRJ-200 VR4400MC
   D30412LRJ-250 VR4400MC
  VR5000
   D30500RJ-180 VR5000
  VR10000
   D30700RS-180 VR10000
   D30700LRS-250 VR10000
  VR12000
   D30710RS-300 VR12000
 Performance Semi
  R3000
   PR3000-33PGC
   PR3000A-33MQ160C
  R3010 FPU
   PR3010A-25PGC
   PR3010-33PGC
 QED
  RM7000
   RM7000-250S (old Logo)
   RM7000-250S (new Logo)
 Siemens
  R3000
   R3000-25-A
   R3000-25-QF
   R3000A-25-QF
   R3000A-33-AE
  R3010 FPU
   R3010-25-A
   R3010-25-QF
   R3010A-25-QF
 Sony
  Emotion Engine
   CXD9615GB 'Emotion Engine'
 Toshiba
  R4000
   TC85R4000PC-50
   TC85R4000SC-50
  R4400
   TC86R4400MC-200
  R10000
   TC86R10000-195
   TC86R10000-200