Disk Shift Register

This document is a technical schematic for the M233 Disk Shift Register, copyrighted by Digital Equipment Corporation in 1969. The circuit utilizes three DEC8271 integrated circuits connected in a series configuration to function as a shift register. Key features of the schematic include:

• Logic Inputs: Controls for Clock, Shift, Clear, and Load Enable signals.
• Data Path: A serial data input leading through three sequential IC stages (E3, E2, and E1) with multiple parallel input/output points.
• Power Requirements: Standard power circuitry including +5V and +3V supply lines with specified resistors (330Ω and 750Ω) and bypass capacitors.
• Technical Specifications: The document notes that all resistors are 1/4W, 5% and all capacitors are 0.1μFD, 100V, 20%. It also defines the pinout for the ICs, specifically noting that pin 8 is Ground and pin 16 is +5V.