Device: D/T8550
Model: M
Tip key:
Date created: O95/04/03
Date last altered: A95/04/03
SYMPTOM:
IBM PS/2 8555SX systems may fail to function at an increased
processor speed after installing the 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 labelled
"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/N13H6694, FRU P/N13H6697, card assembly
P/N78G2521.
_________________________________________
| _|_______System board
| ___________ |
| (___________)fuse |
| Memory Sockets |
| ______________ __ | __ |
| | | | | | | |
| | | | | | | |
| | PINTO 3A | | | | | |
| | 64F3646 | | | | | |
| | | | | | | |
| | | | | | | |
| |______________| | | | | |
| | | | | |
| | | | | |
| |__| |__| |
|_________________________________________|
The diskette utility provided with the 486SLC Processor Upgrade
contains a benchmark test called PUZZLE.EXE. When this test is
performed on a system with the processor upgrade, the results
are consistent with the test results of the original system
board with the Intel 386SX processor installed (45-125 seconds).