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D-10
SPARCcenter 2000 System Board Manual—October 1994
D
D.7 Identifying SIMM or NVSIMM Types
Do not mix SIMMs of different memory capacities in a bank. (SIMMs from
different manufacturers can be mixed, so long as the memory capacities are
equal. SIMM speeds are limited by the speed of the slowest SIMM.) The system
board has various SIMM options:
•
The 8 Mbyte SIMMs are shown as Type A and Type B in Figure D-5.
•
The 32 Mbyte SIMMs are also shown as Type A and Type B in Figure D-5.
Note – Because the SIMM outline varies by the manufacturer, identify the 8
Mbyte and 32 SIMM capacities by the number of pins on each DRAM: DRAMs
on 8 Mbyte SIMMs have 20 pins. DRAMs on 32 Mbyte SIMMs have 24 pins.
•
The 1 Mbyte NVSIMM is identified by the presence of a battery. Refer to
Type C in Figure D-5.
Figure D-5
SIMM Variations
D.8 Locating a Disk Drive Tray
The system cabinet can hold up to three disk drive trays. Install the trays from
the bottom up. For identification purposes, the trays will be numbered 1
(bottom), 2 (middle), and 3 (top). The tray numbering for an expansion cabinet
also starts from the bottom position. Individual disk drive numbers range from
SCSI ID 0 to ID 5 in a drive tray.
1
34
35
68
1
34
35
68
Type A
8 Mbyte or
32 Mbyte
Type B
8 Mbyte or
32 Mbyte
1
34
35
68
Battery
Type C
1 Mbyte NVSIMM