This is an MMU for the famous DEC PDP F-11 (Fonz, 302 and 303). 3.6 MHz, 6micron NMOS, 10k transistors.
DEC 304E 21-15542-01 5084-30 8313
DC304 MMU SADIE VMS DZ AV MR SH SM WVBH PC BJ TGS (DEC logo) (C) 1978
mz_lmplan10x
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