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42 SBC-350A User's Manual
Installing DRAM (SIMMs)
You can install anywhere from 1 MB to 16 MB of on-board
DRAM memory using 256 KBx9, 1 MBx9 or 4 MBx9 SIMMs
(Single In-line Memory Modules). Access time should be 70 ns or
less.
Memory installs in one bank composed of four SIMM sockets. See
the figure on page 5 for help identifying the banks. You must fill all
four sockets, and all SIMMs must be of the same capacity, i. e. you
cannot mix 256 KB SIMMs with 1 MB SIMMs. The following
table shows the memory size for different SIMM capacities:
System memory size SIMM size and number
1 MB 256 KB x 4 pcs
4 MB 1 MB x 4 pcs
16 MB 4 MB x 4 pcs
The procedure for installing SIMMs appears below. Please follow
these steps carefully.
1. Locate the CPU card’s memory banks, shown in the figure on
page 5.
2. Install the SIMM cards. Install each SIMM so that its chips face
away from the CPU and its gold pins point down into the
SIMM socket.
3. Slip each SIMM into a socket at a 45 degree angle and careful-
ly fit the bottom of the card against the connectors.
4. Gently push the SIMM into a perpendicular position until the
clips on the ends of the SIMM sockets snap into place.
5. Check to ensure that each SIMM is correctly seated and all
connector contacts touch. The SIMM should not move around
in its socket.