IBM Aptiva Handbook page 78

The system board, sometimes called the planar or
motherboard, is the main circuit board in the system
unit. It supports a variety of devices and provides other
basic computer functions that are preinstalled or that
you can install later. The system board shown on
page 63 has the following parts:
1
12V speaker connector. Holds the connector for
12V speakers.
2
Power switch connector. Holds the connector
from the power switch.
3
5V auxiliary power supply connector. Holds the
3-wire connector from the power supply.
4
Wake Up on Ring connector. Holds the Wake Up
on Ring cable that attaches to the internal modem.
5
Power supply connector. Holds connectors P1
and P2 from the power supply. Connector P10
attaches to the riser card.
6
Local Bus IDE connector 1. Holds signal cables
that attach to drives.
7
Local Bus IDE connector 2. Holds signal cables
that attach to drives.
8
Diskette drive connector. Holds signal cables
that attach to drives.
9
3.3V power supply connector. Holds connector
P11 from the power supply.
10
Battery. A 3-volt (CR2032) lithium battery. If you
replace the battery, you must use the same type.
64 Chapter 6: Adding and replacing system board components
Cache memory module socket. Can hold a
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256KB or 512KB cache memory module. Any cache
memory module you install must meet the following
specifications.
Specifications: 160-pin; 64-bit; 256KB (32KBx64) or
512KB (64KBx64); 15 nanoseconds (ns); pipelined
burst synchronous SRAM.
12
Processor socket. Holds the processor.
13 Processor. A Pentium class processor.
Memory module sockets (for SIMMs). Your
14
system board has a set (bank) of sockets for system
memory modules. These memory modules are called
single inline memory modules (SIMMs). The sockets
are numbered 1 through 4, with socket 4 at the edge
of the board.
You can upgrade the memory on your system board
to a maximum of 128MB. Before you remove modules
from or insert modules into any of the sockets, see
"Installing system memory modules" on page 68 for
guidelines you must follow. For possible module
placement configurations, see the specification table
in "Memory module placement" on page 151. Any
SIMM you install must meet the following
specifications.
Specifications: 72-pin; 32-bit or 36-bit; 4MB, 8MB,
16MB, or 32MB; 60 nanoseconds (ns); tin-lead
contacts; fast-page mode or extended data out (EDO);
dynamic random access memory (DRAM).
15 VESA video feature connector. Used for motion
video adapter cards, such as a television card.
Riser card connector. Holds the riser card, which
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contains connectors for adapter cards.