Toshiba Equium 5160D Series Preliminary Maintenance Manual page 18

The four sockets are arranged in two banks of two sockets each. The sockets are designated
Bank 0 and Bank 1. Each bank provides a 64/72-bit wide data path. Both SIMMs in a bank
must be of the same memory size and type, although the types and sizes of memory may differ
between banks. Bank 0 only, Bank 1 only, or both of the banks may be populated. There are
no jumper settings required for the memory size or type, which is automatically detected by
the system BIOS. Use only tin lead SIMMs when adding DRAM.
Note: Due to electrical loading characteristics, 64 MB SIMMs using 16 Mb
technology are not qualified for use on the AP440FX system board. 64 MB
SIMMs using 64 Mb technology have not been qualified, however, they may be
supported by the system board when they become available, depending upon the
individual characteristics of the memory module. If 64 MB SIMMs are qualified
for use on the AP440FX system board, the total onboard memory capacity
becomes 256 MB.
Extended Data Out (or Hyper Page) DRAM is designed to improve the DRAM read
performance. EDO DRAM holds the memory data valid until the next memory access cycle,
unlike standard fast page mode DRAM that tri-states the memory data when the precharge
cycle occurs, prior to the next memory access cycle. EDO DRAM timings are X-2-2-2.
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