DEC Digital PC 3500 System Reference Manual page 99

Main Logic Board Expansion
Computer memory is installed using the three DIMM sockets located on the main
logic board as shown in Figure 4-1. All three DIMM sockets (J18, J19, and J20)
accept single or dual bank DIMMs.
When adding memory make sure you reference the memory configuration table and
follow these memory expansion guidelines:
•
Install 168-pin DIMMs using 66 MHz (or faster), 64-bit SDRAMs.
NOTE
DIGITAL does not support computer performance, product
warranty, or service calls resulting from installation of non-qualified
DIMMs.
•
Single bank DIMMs are available in 16 MB and 64 MB memory modules.
Single bank DIMMs have components to provide one 64-bit wide memory
access.
•
Dual bank DIMMs are available in 32 MB and 128 MB memory modules.
Dual bank DIMMs have two sets of components, each providing 64 bits
(ECC DIMMs are 72 bits wide).
4-2
: Install DIMMs supplied by Digital Equipment Corporation.