IBM 6643 - Manual (Page 23)

22 Ethernet connector
23 PS/2 keyboard and mouse connector.
CMOS Clear jumper settings
CMOS Clear Jumper Description
1.2 Normal
2.3 Clear CMOS
To clear CMOS, see “CMOS Clear Procedure” on page 72.
Processor Speed Settings
Processor FSB speed for the IBM Personal Computer Types 2179 and 6643 are set
in the Setup Utility (configuration) program. There are no jumper settings for
processor speed.
System Board Memory
Types 2179 and 6643 use PC133 Non-Parity DIMM memory modules.
Removing a DIMM
Note:
Be careful not to push too hard on the retaining clips, because the DIMM might eject too
quickly.
Chapter 4. FRU replacements 15