MP01614 TA78schem Jul84

This document is a "Field Maintenance Print Set" (MP-01614) for the Digital Equipment Corporation TA78 Tape Drive, covering variations TA78-BF and TA78-BJ. It is a comprehensive technical manual designed for maintenance and assembly purposes.

The print set includes:

• Mechanical Drawings: Detailed exploded views and assembly diagrams illustrating the physical construction of the TA78 Tape Drive, including its frame, logic assemblies, power/pneumatic assembly, doors, covers, and filters.

• Electronic Schematics and Component Layouts: Circuit diagrams and printed circuit board layouts for several key electronic modules:

  • STI Interface Protocol Micro (detailing logic, data path, clock generation, Error Detection and Correction (EDC), and 8085 timer functions).
  • STI Interface Bus Logic (covering power/connection, data receiver/transmitter, and control functions).
  • 8085 Microcomputer (for CPU, register decode, memory, clock control, and ASCII interface).
  • 8085 Extended Memory Board.

• Parts Lists: Extensive lists of all components required for the TA78 Tape Drive, its various electronic boards, and sub-assemblies.

• Wiring and Harness Assemblies: Diagrams and associated parts lists for the internal wiring and specific cable assemblies, including a "Cable, Joystick."
• Rework Instructions: Specific instructions for wire additions or component modifications on certain boards, such as the STI Interface Protocol Micro and the 8085 Microcomputer.

The document emphasizes its confidential and proprietary nature, belonging to Digital Equipment Corporation, with copyrights dating from 1982.