M216

This document is a proprietary schematic diagram (M216-0-1, Rev B) for a "SIX FLIP-FLOPS M216" circuit, copyrighted by Digital Equipment Corporation in 1967. It is intended solely for test and maintenance.

Key features of the schematic include:

• Components: It utilizes three integrated circuits (E1, E2, E3), identified as DEC7474N type (likely dual D-type flip-flops, thus "six flip-flops"). Three 0.01 MFD, 100V decoupling capacitors (C1, C2, C3) are also present.
• Circuit Functionality: The diagram illustrates the interconnections of these flip-flops, showing various inputs such as "DIRECT CLEAR," "DIRECT SET," and other data/clock lines (AI, DI, K2, etc.), and outputs (F2, K1, N2, R1, U2).
• Power Supply: The circuit operates on +5V and Ground (GND). A -15V line is shown but marked "NOT USED."
• IC Pin Assignments: Important notes specify that Pin 7 on each integrated circuit is connected to GND and Pin 14 to +5V.
• Documentation Details: The drawing was prepared by M. Waller on April 15, 1967.