Zur deutschen Seite

Single Inline Memory Module (SIMM)

Fabrication Responsibility:
Lyle Johnson, WA7GXD (USA)
Chuck Green, N0ADI (USA)
Larry Brown, NW7N (USA)


The Single Inline Memory Module (SIMM) was developed to provide 16 megabytes for the GPS computer and each of the two RUDAK computers and still allow these computers to fit in their respective P3D module boxes.

Each SIMM consists of 24 each 1 megabit, 20-nSec static RAM chips, along with buffers. The mechanical design is such that they mount at a right angle to the PC board which hosts them (GPS or RUDAK). They are sandwiched with aluminum heat spreaders which also act as additional radiation shields.

The modules are organized so they can serve as 2Mx12 or up to four (4) sections of 1Mx3. This allows their use in the 39-bit-wide GPS memory system or the 12-bit-wide RUDAK memory system.

Last updated: Feb 5, 1996
by Ralf Zimmermann, DL1FDT