SIMM Infonnation
SIMM Size Jumpers (2)
-
are set to 1 M (1 MegaByte
SIMMS). Move the
jumpers to the 4M
positions when changing
to 4 MegaByte SIMMS.
-
Jumper is connected for
STANDARD SIMM
Memory. Move to the other
pins when using expansion
SIMM slots.
-
Two 1 MegaByte SlMMs
-
Expansion slots are empty
Figure 29
-
SIMM Access on the new Rev Board
You will notice that there are two slots with SIMMs installed, and two slots that are empty.
These empty slots are called Expansion SIMM Slots, and are used for installing additional
SIMMs (when expanding the memory). Directly above the Standard SIMM Slots, you will find
the Memory Expansion Jumper, and a pair of SIMM Size Jumpers.
About the Memory Expansion Jumper
The Memory Expansion Jumper allows you to access the information in the Expansion SIMM
Slots. It must be moved to the EXP (Expansion) pins in order for any SIMMs plugged into the
expansion slots to be recognized. If you do not have any SIMMs plugged into the Expansion
slots, the Memory Expansion Jumper must be installed on the STD (Standard) pins, or the ASR-
10 will not boot up (display will be blank).
About the SIMM
size
Jumpers
The SIMM Size Jumpers determines whether the ASR-10 will recognize lMegaJ3yte or
4MegaByte SlMMs. Both jumpers must be set to the same value (i.e., either both lM, or both
4M). The ASR-10 will not work properly if one is set to 4M and the other to
1M.
Installing SlMMs (new Rev board)
Memory is user installable in
2,4,8,
and 16 MegaByte configurations, with 1 and 4 MegaByte
SIMMs. There are only four possible memory configurations available on the ASR-10, as shown
in the diagram:
ASR Service Manual
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