This is an MMU for the famous DEC PDP F-11 (Fonz, 302 and 303). 3.6 MHz, 6micron NMOS, 10k transistors.

Package

DEC 304E
21-15542-01
5084-30
8313

Die

DC304

MMU
SADIE VMS

DZ AV MR SH SM WVBH PC BJ TGS

(DEC logo) (C) 1978