191-201 Cached Processor Option for Model 8557
SHS04G5106 IBM PS/2 Cached Processor Option HML
EPRM IBM PS/2 Cached Processor Option for Mod. 56/57
rf855657.exe 8556/8557 reference diskette v2.10 -supports SLC2/SLC3 upgrades
8556/57 Diags Disk Ver 2.04 or better supports all 8556/57 386SX / SLC
systems, including 8556/57 systems with processor options: 386SLC, 486SLC2,
8556/57 Cached Processor Upgrade FRU 92F0078
Note the unpopulated jumper "BYPASS JUMPER".
Not having one in-hand, I see the wires from the OS1 outline, going under
- IBM 386SLC-20 with Internal memory cache controller and 8KB cache memory
- Improves processor throughput up to 88% depending on application
- Installs into a math co-processor 121-pin socket connector
- Provides a socket for 80387SX 20MHz or equivalent math co-pro.