486SLC3 CPU Upgrade
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
U1 Reverse of mounting pins
U2 Socket for PLCC 387SX
U4 486SLC3 CPU
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.
FEATURES AND PERFORMANCE ENHANCEMENTS
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
You can address up to 16MB of memory with this.
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