I have the datasheet. It is a 64kx16 static ram module. Can be configured as 64kx16, 128kx8 or 256kx4. Offered 25 to 65ns access time. If you need more email me, the datasheet is 8 pages. Mine is 1990. David Gesswein http://www.pdp8.net/ -- Run an old computer with blinkenlights.