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If you have this upgrade module, please Contact Us.
PS/2 8555 486SLC Upgrade Performance Failure H127022
IBM PS/2 8555SX systems may fail to function at an increased processor speed
after installing 486SLC processor upgrade.
Problem Isolation Aids
A limited number of PS/2 8555SX system boards contain a module located to
the left of the memory SIMM sockets labeled "Pinto 3A #64F3646." This chip may
conflict with the bus timings of the 486SLC Processor upgrade which results in
a reduction in processor performance. The "Pinto 3A" chip only affects IBM
option P/N 13H6694, FRU P/N 13H6697, card assembly P/N 78G2521.
_________________________________________
| _|_______System Board
| ___________ |
| (___________)Fuse |
| Memory Sockets |
| ______________ __ | __ |
| | | | | | | |
| | | | | | | |
| | PINTO 3A | | | | | |
| | 64F3646 | | | | | |
| | | | | | | |
| | | | | | | |
| |______________| | | | | |
| | | | | |
| | | | | |
| |__| |__| |
|_________________________________________|
The record says the affected planars were removed from stock. There are two
main variants of the 8555 SX, the Early
(ZM16) and Late (ZM22)
planars. Both of my sample boards do not have 64F3646.
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