User Guide

Hardware Installation
2-7
2.6 Configuring the System Memory
The system memory is expandable to 512 MB by adding single in-line
memory modules (SIMMs). The four 72-pin SIMM sockets accommodate
4-, 16- and 64-MB single-density SIMMs, and 8- and 32-MB double-density
SIMMs. These SIMM sockets also accept both FPM and EDO type DRAMs,
with or without parity. The EDO feature extends the data transfer cycle, thus
improves memory performance. All SIMMs support a DRAM speed of 60/70
ns or less.
The SIMMs with parity supports the ECC (Error Checking and Correction)
feature that enables the system to detect and correct data errors. To fully
support this function, you must install 36-bit parity-type SIMMs (i.e., 8 chips
plus 4 parity chips) in pairs in all banks. The combination of 32-bit non-parity
(i.e., 8 chips) and 36-bit parity-type (i.e., 12 chips) memory configuration is
also possible; however, this does not allow you to make use of the ECC
function.
The following are the possible SIMM configurations. Notice that you must
install the same SIMMs in one bank.
Memory Configurations
Bank 0 Bank 1 Total
SIMM 1 SIMM 2 SIMM 3 SIMM 4 Memory
4 MB 4 MB 8 MB
4 MB 4 MB 4 MB 4 MB 16 MB
8 MB 8 MB 16 MB
8 MB 8 MB 4 MB 4 MB 24 MB
8 MB 8 MB 8 MB 8 MB 32 MB
16 MB 16 MB 32 MB