Twister LX System Board Manual
Chapter 3: Installing the Twister
LX
19
System Memory
System memory is necessary to operate the Twister LX
system board. The Twister LX has three 3.3V unbuffered
64/72-bit, 168-pin DIMM sockets for a maximum of
768MB of EDO memory and 384MB of SDRAM memory.
This section list the rules for adding memory to the
Twister LX, give some examples of common memory
configurations and show how to physically install the
memory.
NOTE: One of the numerous features of Twister LX
allows support for SDRAM with and without SPD
(Serial Presence Detect) support.
Adding Memory
The following is a list of rules to follow when installing
DIMMs. If you follow these rules, your upgrade should be
trouble-free:
❏
Use 10ns or faster SDRAM or 60ns or faster EDO
DIMMs.
❏
DIMM memory modules support EDO and SDRAM
(unbuffered) memory types.
❏
Singled-sided and double-sided memory modules are
supported.
❏
Different memory types and sizes in separate banks
will cause the performance of the memory to run at
the speed of the slowest RAM installed, and/or cause
operating system stability problems.
For long
term
reliability,
Micronics
recom-
mends
using
DIMMs with
gold-plated
contacts.
The use of
tin-plated
contacts
may conflict
with the
gold alloy
on the
DIMM
socket.
168-Pin DIMM
one
bank
