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System Overview 1-13
System Board
The subsections that follow provide service-related information about system
board components.
Figure 1-10. System Board Features
Main Memory
The four SIMM sockets can accommodate one or two pairs of EDO SIMMs.
The base configuration for main memory is one pair of 16-MB nonparity
SIMMs installed in sockets J6J1 and J6J2. Main memory can be expanded
using pairs of 16- or 32-MB SIMMs. The SIMMs within each pair (J6J1 and
J6J2 or J7J1 and J7J2) must be the same capacity and parity type, but the two
pairs need not match each other.
The system’s ECC support, which is built into the system board, corrects single-
bit errors and detects all multiple-bit errors. To use the ECC support, all
installed SIMMs must be parity SIMMs.
parallel port
connector (PARALLEL)
mouse connector
(MOUSE)
diskette-drive interface
connector (FLOPPY)
power input connector
(POWER)
secondary EIDE channel
connector (SEC IDE)
ISA expansion-card
connectors (ISA1,
ISA2, and ISA3)
keyboard connector
(KEYBRD)
SEC cartridge
connector (SLOT 1)
system board
jumpers
primary EIDE channel
connector (PRI IDE)
PCI expansion-card
connectors (PCI1,
PCI2, PCI3, and PCI4)
control panel
connector (J9D1)
battery socket (BT9M1)
serial port
connector (SER1)
SIMM sockets
(J6J1, J6J2, J7J1, and J7J2)
microprocessor fan
connector (J8L1)
wave-table upgrade
connectors (J7C1
and J7D1)
SCSI hard-disk drive
access indicator cable
connector (J8D1)
3.3-V power
input connector
(J7M1)
USB connectors
(USB)
integrated audio
controller jacks
(LINE OUT, LINE
IN, and MIC IN)
MIDI/game port
(GAME/AUDIO)
CD-ROM drive
audio cable
connector (CDROM)