GT44 Graphics System

This manual provides comprehensive documentation for the GT44 Graphics System, a disk-based PDP-11/40 computer enhanced with graphic processing capabilities. It covers system architecture (including the VT11 Graphic Display Processor, VR17 CRT, and Light Pen), technical equipment specifications, operating procedures, and programming concepts. The document also includes details on the PDP-11/40 instruction set, VT11 instruction set, and advanced programming techniques such as subroutines, light pen interaction, and managing flicker-free displays. Appendices provide character code tables and the BM792-YB bootstrap loader program listing.