DTK Apex 386/33, User Manual

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Card Setup
Memory Banks
The ‘386 RAM Card memory is divided into three banks. At the very
least, bank 0 must be full for the card to function. By setting DIP switch
SW1 and jumpers W1 - W3 the PEI-306 ‘386 RAM Card can be set up
with a minimum of 1 MB and a maximum of 12MB memory.
The PEI-306 RAM Card has SIMM-type RAM module sockets. These
30-pin single-in-line sockets are aligned at an angle of 25 degrees.
Refer to the figure below.
Notch
—— RAM Module
RAM Module
— S o c k e t
Figure 6-11: SIMM-Type RAM Module
Remember that when inserting the RAM module, you must make sure
the notched or dotted end of the module is lined up with the notched
end of the socket. Gently push the RAM module into the socket.
Three banks (bank 0, 1 and 2) for memory are on the PEI-306. Each
bank accomdates a 32-bit wide data bus. Bank 0 must be filled first.
The three banks must be filled with the same type of RAM: either
41256 or 411000.
Chapter 6: Appendix 11