486SLC3 CPU Upgrade
194-031  IBM PS/2 486SLC3 Processor Upgrade

IBM 486SLC3 Processor Upgrade
   This upgrade can be installed only in the 80387SX Math Co-Processor socket connector on the system board of the PS/2 56 SX, 56 SLC and 56 SLC2 systems, the PS/2 57 SX, 57 SLC and 57 SLC2 systems, or the 7546 Industrial Computer.

      Remove any installed Math Copro (and also any math-Copro empty socket) Install the plastic guide and plastic insert on the system board. 
      Insert any removed PLCC Math Copro into 486SLC3 Processor Upgrade board in U2. 
      Install the Upgrade board until the pins are fully-seated, and the edge-snaps click into place. 

486SLC3 Upgrade Board

VR1 LT1085CT
U1 Reverse of mounting pins 
U2 Socket for PLCC 387SX 
U4 486SLC3 CPU 

Identification Aids-
  The CPU has a heatsink mounted on it, like the one used on the early XGA-2 cards. If you miss that, notice the voltage regulator. And if all that fails, turn the upgrade upside down and look by the pins for the PGA header. See the sticker for the FCC ID#- ANOIBM486SLC3.

The processor operates at three times the speed of the base system planar. It supports 20 and 25MHz speeds, with the achieved processor speeds are 60MHz and 75MHz respectively.
       The cpu includes an internal memory cache controller and 16KB memory cache.  The combination of triple clock speed, integrated cache and optimized instructions provides sizable performance improvements.
   You can address up to 16MB of memory with this.

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