Originally, Apple did not use DIP SIMMs in the Macintosh SE, because they did
not fit. However, in July 1988, we revised our SIMM strategy for the Macintosh
SE and began shipping the DIP SIMMs with the Macintosh SE. The Macintosh SE
logic board was revised, and a jumper added that lets you put DIP SIMMs in
banks 3 and 4 (the two frontmost banks), and still have room to install an
option board.
This information is documented in the "Technical Procedures" manuals and in a
service notice sent to Apple dealers in July 1988.