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Cyrix
Corporate information

Cyrix began in 1988 as a specialist manufacturer of high-performance maths co-processors for 286 and 386 systems. The company was founded by ex-Texas Instruments staff.

Cyrix had always been a fabless manufacturer. In the early days they used Texas Instruments and SGS Thomson production facilities. In 1994, Cyrix turned to IBM Microelectronics.

Cyrix produced their own design CPUs such as 486 class processors (with partly Pentium technology and 486 pinout called 5x86) and Pentium Pro class CPUs with Pentium pinout (6x86) using a RISC core with x86 translation. 6x86s were known to have slow FPUs though.

Unlike AMD, Cyrix had never manufactured or sold Intel designs under license, but designed everything in-house, from the ground up.

In August 1997 Cyrix merged with National Semiconductor.

In June 1999, VIA bought what was left from Cyrix. By this time the original development team was no more, the products were hopelessly out of date, and the only thing left of value was the Cyrix name.

Chip markings:
 


http://www.viatech.com
  add/correct Cyrix info  
96 Cyrix chips in collection: show thumbnails
 Cx486 DLC
   Cx486DLC-33GP black
   Cx486DLC-33GP
   Cx486DLC-33GP OEM
   Cx486DLC-33GP OEM
   Cx486DLC-40GP
 Cx486 SLC
   Cx486SLC/e-V25MP
   Cx486SLC/e-33MP
 Cx486 DRx
   Cx486DRx²25/50GP
   Cx486DRx²33/66GP
 Cx486 DX
   Cx486DX-33GP
   Cx486DX-V33QP
   Cx486DX-40GP
   Cx486DX-40 w/ Cooler, old Logo
   Cx486DX-40 w/ Cooler, newer Logo
   Cx486DX-40 w/ Cooler, new Logo
   Cx486DX2-50GP
   Cx486DX2-50 w/ Cooler
   Cx486DX2-50 w/ Cooler, 'Write-Back'
   Cx486DX2-66GP
   Cx486DX2-66GP ("Cooling Fan Required")
   Cx486DX2-V66GP
   Cx486DX2-V66GP 3.45V
   Cx486DX2-66 w/ Cooler
   Cx486DX2-V80GP 4.0V
   Cx486DX2-V80GP 3.45V
   Cx486DX2-80 w/ Cooler
   Cx486DX4-100GP
   Cx486DX4-100GP4
 Cx486 S
   Cx486S-33GP
   Cx486S-40 w/ Cooler
   Cx486S-40GP
 5x86
   5x86-100GP w/ Cooler
   5x86-100GP (026-3.6V)
   5x86-100GP (030-3.45V)
   5x86-100QP
   5x86-120GP
 6x86
   6x86-P150+GP
   6x86-P150+GP, no Voltage Markings
   6x86-P150+GP w/ Capacitors
   6x86-P166+GP 3.53V
   6x86-P166+GP
   6x86-PR166+GP
   6x86L-P150+GP
   6x86L-PR166+GP
   6x86L-PR200+GP
   6x86L-PR200+GP, Variant
 6x86MX
   6x86MX-PR166
   6x86MX-PR200, 75 MHz Bus
   6x86MX-PR200, 66 MHz Bus
   6x86MX-PR233
 M II
   M II-233GP, 66 MHz Bus, Dark
   M II-266GP, 66 MHz Bus
   M II-300GP, 66 MHz Bus
   M II-300GP, 66 MHz Bus, Dark
   M II-300GP, 75 MHz Bus
   M II-333GP, 66 MHz Bus, Silver
   M II-333GP, 75 MHz Bus
   M II-333GP, 83 MHz Bus, Engineering Sample
   M II-366GP, 100 MHz Bus
   M II-400GP, 95 MHz Bus
 MediaGX
   Gx86 GX-133BP
   MediaGX GX-120BP
   MediaGX GX-133BP
   MediaGX GX-150BP
   MediaGX GXI-166BP
   MediaGX GXI-180BP
   MediaGX GXI-180BP (silver)
   MediaGX GXm-233BP
   MediaGX GXm-266BP
   MediaGX GXm-180GP
   MediaGX GXm-200GP
   MediaGX GXm-200GP 85C
   MediaGX GXm-233GP
   MediaGX GXm-266GP
 FPU
   FasMath CX-82S87-NP-SV
   387DX-33
   FasMath CX-83D87-20-GP-XA
   FasMath CX-83D87-25 GP
   FasMath CX-83D87-25-GP-KN
   FasMath CX-83D87-25-GP-XA
   FasMath CX-83D87-33 GP
   FasMath CX-83D87-33-GP, black
   FasMath CX-83D87-33-GP-KN
   FasMath CX-83D87-40-GP
   387DX+
   FasMath CX-83S87-16-JP
   FasMath CX-83S87-16-KP
   FasMath CX-83S87-20-JP
   FasMath CX-83S87-20-KP
   FasMath CX-83S87-25-JP
   FasMath CX-83S87-33-JP
   Cx487DLC-33GP
   Cx87DLC-33QP
   Cx87DLC-40QP
   Cx487S-33QP
   Cx487S-40QP