Td8-E Dectape Control

This document provides a technical overview and installation guide for the TD8-E Simple DECtape Control, which interfaces between a PDP-8/E OMNIBUS system and TU56/TU56MH Tape Drive units.

Key highlights include:

• System Overview: The TD8-E uses an M868 quad module to manage data assembly/disassembly, tape motion (direction, start/stop), and read/write operations via command and data registers.
• Installation & Testing: Installation requires specific jumper configurations on M868 and M960 modules to select I/O codes and unit numbers. Acceptance testing involves running the DEC-8E-EUZC-D Formatter Program and the MAINDEC-08-DHTDA diagnostic program.
• Interface Details: A detailed breakdown of the 7008447 cable interface and pinouts for M960/M961 connector modules is provided.
• Functional Description: The manual lists specific instructions (SDSS, SDST, SDSQ, SDLC, SDLD, SDRC, SDRD) used by the PDP-8/E to control tape operations and status monitoring.
• Configuration: It explains how to set up up to four TD8-E modules on an OMNIBUS to control a maximum of eight tape units, utilizing specific octal codes and device code jumpers.