ALR Rack-Mountable Revolution 6x6
 System Board (PCB# 12210290)
Ram Expansion Chart
DIMM Memory Board
Installation Procedure
You must install two SIMMs of the same size and type with a speed of 60-ns in each occupied row. The Revolution 6x6 comes standard with 128-MB of ECC memory installed on the SIMM card. System memory is expandable to 2-GB on SIMM card and up to 4-GB on optional DIMM card.
MEMORY SUBSYSTEM ARCHITECTURE
The Revolution Quad6 memory subsystem architecture supports three types of configurations:
- 4:1 interleaved consists of four or eight rows
- 2:1 interleaved consists of two or six rows
- 1:1 interleaved consists of one row
An interleave in this system requires a minimum of two 36-bit SIMMs (1 row/72-bit wide) containing a total of 64 data bits plus 8 bits of ECC RAM. To ensure optimum performance, follow the procedures below when installing memory.
IMPORTANT! For optimum performance, select a 4:1 interleaved type whenever possible.
- Install SIMMs one row at a time and in successive order, starting with row 1. (A row consists of two memory slots.)
- Use only identical type and size SIMMs with a speed of 60-ns or faster.
Configurations
RAM EXPANSION CHART
Refer to the table and performance guide below for proper RAM configuration.
|
Interleave Type
|
1:1
|
2:1
|
|
SIMM Size
|
SIMM Quantity
|
Total Memory
|
SIMM Quantity
|
Total Memory
|
SIMM Quantity
|
|
512KB x 36
|
2
|
4MB
|
4
|
8MB
|
8
|
|
1MB x 36
|
2
|
8MB
|
4
|
16MB
|
8
|
|
2MB x 36
|
2
|
16MB
|
4
|
32MB
|
8
|
|
4MB x 36
|
2
|
32MB
|
4
|
64MB
|
8
|
|
8MB x 36
|
2
|
64MB
|
4
|
128MB
|
8
|
|
16MB x 36
|
2
|
128MB
|
4
|
256MB
|
8
|
|
32MB x 36
|
2
|
256MB
|
4
|
512MB
|
8
|
|
4:1
|
|
Total Memory Minimum
|
SIMM Quantity
|
Total Memory Maximum
|
|
16MB
|
16
|
32MB
|
|
32MB
|
16
|
64MB
|
|
64MB
|
16
|
128MB
|
|
128MB
|
16
|
256MB
|
|
256MB
|
16
|
512MB
|
|
512MB
|
16
|
1GB
|
|
1GB
|
16
|
2GB
|
INSTALLING MEMORY
NOTE: If you are unsure of the location of the system memory slot, refer to Users Guide for the illustration of the system board.
- Open the system as described in the Users Guide.
- Remove the card retaining bracket securing the memory card to the chassis. Save both bracket and screws.
- Gently pull out the memory card from the system board and lay it (top side up) on a static-free surface.
- Angle the memory module about 45 degrees and insert it into the socket as shown below.
- Push the memory module into the socket until it is firmly seated.
- Tilt up the memory module to a vertical position until the spring-loaded latches locks it into place.
- Repeat steps 4 through 6 to install additional memory modules.
- Reinstall the memory card, making sure it seats firmly into the system board memory slot.
- Secure the memory card with the bracket and screws you removed in step 2.
- Close the system and power it up.
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