IBM 6643, 2179 manual System board layout

7.Lift the computer as shown and take care not to let the keyboard slide off the base.

System board layout

3 2 1

1 Microprocessor connector

2 System fan connector (not used)
3 DIMM connectors

4 Power connector
5 Inverter connector

6 CD-ROM drive or DVD drive connector
7 Diskette drive connector

8 Hard disk drive connector
9 LCD connector

10 CMOS clear jumper
11 Battery

12 PCI expansion slot
13 PCI expansion slot
14 Reserved (not used)

15 CD-ROM or DVD-ROM audio connector
16 Speaker connector

17 USB connector

18 BTN (button) connector
19 IR (Infra Red) connector
20 Audio I/O and USB connector

21 CPU fan connector (fan located on EMC shield)

14Hardware Maintenance Manual