32-Bit Local Memory Size; Table 2-9: Switch Settings For Different 32-Bit Local Memory Sizes - Datatech Enterprises Apex 386/25 User Manual

32-bit Local Memory Size

Switches 3 and 4 of SW1 are used to select local memory size (total
onboard 32-bit memory plus the 32-bit memory on the PEI-306). Note
that the settings are for 32-bit memory sizes less than or equal to the
memory sizes indicated in the table.

Table 2-9: Switch Settings for Different 32-bit Local Memory Sizes

To add a 16-bit RAM Board in the AT slot, your total 32-bit memory must
equal exactly either 2MB, 4MB or 8MB. Otherwise, your system will
crash due to a starting address conflict for the 16-bit memory on the
RAM board.
Remember that you'll have to insert the four pieces of module RAM
before you can add a 32-bit extension memory card.
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Chapter 2: Setting Up your System