System Board
1-13
1.7
Memory Configurations
The system board comes with six 72-pin SIMM sockets that allows you
to expand memory to a maximum of 384 MB. The SIMM sockets
support 5V FPM/EDO DRAMs with 4-, 8-, 16-, 32-, and 64-MB
capacities and 60ns (or less) access time. The FPM DRAM is the
standard DRAM type. The EDO DRAM is actually very similar to FPM.
The only difference is that EDO DRAM holds the memory data valid
until the next memory access cycle, that is similar to pipeline effect
and therefore reduces one clock state, while traditional FPM tri-states
the memory output data to start the pre-charge activity.
Table 1-3 lists the possible memory configurations.
1.7.1
Rules for Adding Memory
•
Use only one type of SIMM in a given bank.
•
You may combine different types of SIMMs for a memory
configuration as long as the SIMMs in each bank are of the same
type.
•
Always install SIMMs in pairs. For example, for a total memory of
8 MB, install two 4-MB SIMMs into the sockets marked SIMM1
and SIMM2 or SIMM3 and SIMM4. You can not use an 8-MB
SIMM alone for an 8-MB memory.
•
Always install SIMMs from the outermost socket first. For
example, socket SIMM1 before socket SIMM2, or socket SIMM3
before socket SIMM4.
•
Always remove SIMMs from the innermost socket first. For
example, socket SIMM4 before socket SIMM3, or socket SIMM2
before socket SIMM1.
