Specifications

Chapter 2 Installing LittleBoard 550 Options
LittleBoard 550 QuickStart Guide 17
Refer to the Step 4 in the proceeding procedure, Removing the DIMM, and follow the remaining
steps in that procedure before continuing.
4. Remove the DIMM from its protective bag, handling the DIMM by its edges.
NOTE Ampro recommends using only PC 133 (133MHz), 3.3V, 7.5ns, 168-pin,
SDRAM DIMM, but PC 100 (100MHz, 10ns) will function. PC 133
provides the best performance for the Eden processors.
5. Ensure the two retaining latches are spread outward to accept the new DIMM.
6. Align the notches on the DIMM with the keys on the DIMM slot, holding the DIMM at a 90°
angle to the board. See Figure 2-6.
The DIMM card edge and slot are keyed to install the DIMM into the slot in only one direction.
LB550QSG_05b
DIMM
Notches
Keys
Retaining Latches
DIMM Slot
Figure 2-6. Installing the DIMM
7. Insert the DIMM fully into the slot, handling the DIMM by its edges.
The retaining latches should grasp the DIMM automatically if it is inserted properly. If the
latches do not fully close after you have installed the DIMM, the DIMM is not inserted correctly.
8. Apply firm and even pressure as you push down on the DIMM, fully inserting it into the slot.
CAUTION To prevent damage to the DIMM or the socket, do not rock the DIMM
into place, but apply firm and even pressure downward.
9. If the retaining latches do not close completely on the DIMM, remove it and repeat Steps 5 to 8.
10. Reconnect the power cord to the power source.
11. Restore power to the LittleBoard 550 and observe the boot screen for new memory recognition.
If the system does not boot or there is a problem recognizing the new memory, the new DIMM
could be defective or the DIMM was not properly installed or recognized.