DEC-11-HGT44-A-D GT44 Users Guide Dec73

This document is the GT44 User's Guide from Digital Equipment Corporation, published in December 1973. It describes the GT44 Graphics System, a powerful disk-based PDP-11/40 minicomputer enhanced with dedicated graphic capabilities (referred to as "DECgraphic 11/40").

The guide's purpose is to provide information on the system's description, operation, equipment specifications, controls, start-up procedures, and programming techniques.

Key components of the GT44 system include:

• A PDP-11/40 Computer (with Unibus, KD11-A Processor, MF11-L 16K Core Memory).
• A VT11 Graphic Display Processor (the core of the graphics system, generating displays and driving the CRT).
• A VR17 CRT Display Monitor and a 375 Light Pen for interactive visual output and input.
• RK05 Disk Drives with an RK11-D Controller for mass data storage.
• An LA30 DECwriter with a DL11 Asynchronous Line Interface for hard copy I/O.
• A BM792YB Bulk Storage Bootstrap Loader ROM.

The manual details operating controls and indicators for each component, outlines GT44 start-up and failure procedures, and covers programming concepts and restrictions. it includes the instruction sets for both the PDP-11/40 and VT11, provides programming examples (e.g., initializing the display processor, creating a display file, using stop interrupts), and discusses advanced programming techniques such as subroutines, light pen interaction, special characters, edge violations, and non-flicker display strategies.

Appendices provide character codes and a bootstrap loader program listing.