194-031 IBM PS/2 486SLC3 PROCESSOR UPGRADE FOR SELECTED PREMIUM
        SYSTEMS AND IBM 7546 INDUSTRIAL COMPUTER
       The Personal System/2 (R) (PS/2 (R)) 486SLC3 Processor Upgrade
for selected PS/2s and the 7546 Industrial Computer features the IBM
486SLC3 microprocessor.
       The processor operates at three times the speed of the base
system planar.  The base planar of the 8556/57, M57 and IBM 7546
Industrial Computer operates at 20MHz.  The base planar of the
9556/57 operates at 25MHz.  The achieved processor speeds are 60MHz
and 75MHz respectively.
       The microprocessor 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.
       What is the performance improvement?
       Depending on the application* (processor-intensive,
non-floating point), a 25MHz PS/2 56/57 486SLC2 50/25 system with the
PS/2 486SLC3 Processor Upgrade achieves up to 40% performance
improvement!
       Likewise, upgrading a 20MHz PS/2 56/57 386SLC or PS/2 56/57
386SX system with the PS/2 486SLC3 Processor Upgrade achieves up to
187% and 424% performance improvement respectively!
       What systems can be expanded with the 486SLC3 Processor
Upgrade?
o   PS/2 56 SX (8556-043, 045, 14X, 24X)
o   PS/2 56 SLC (8556-055, 059, 15X, 25X)
o   PS/2 57 SX  (8557-045, 049)
o   PS/2 56 SLC2 (9556-0B6, 0BA, DB6, DBA)
o   PS/2 57 SLC2 (9557-0B6, 0BA, DB6, DBA, DBG, 1BA, 2BA)
o   PS/2 M57 SLC (8557-259)
o   PS/2 57 SLC (8557-055, 059 ,05F)
o   PS/2 56 SLC2 (9556-QB6, QBA, KB6, KBA)
o   PS/2 57 SLC2 (9557-QB6, QBA, QBG, KB6, KBA, KBG).
o   7546 Industrial Computer
       Purchase Price:  $535
       Planned Availability Date:  February 1, 1994
 (R) Registered trademark of International Business Machines
   Corporation
*  Lotus 1-2-3 V2.01 for DOS NSTL benchmark.
       IN BRIEF . . .
       The key attributes of the 486SLC3 Processor Upgrade are:
o   Operates at triple the system clock speed (75/60MHz) for internal
    operations, and at the system clock speed (25/20MHz) for external
    operations
o   Depending on the application*, provides performance improvement
    up to:
    -   424% in PS/2 56/57 386SX  (20MHz systems)
    -   187% in PS/2 56/57 386SLC (20MHz systems)
    -   40% in PS/2 56/57 486SLC2 (25/50MHz systems)
o   Internal Memory Cache Controller and Integrated 16KB Cache Memory
o   Easy for customer to install in selected PS/2s and the 7546
    Industrial Computer
o   486 compatible instruction set
o   Provides a socket for 80387SX 20/25MHz or equivalent Math
    Co-Processor
o   16MB real memory addressability