Computer Interactive Graphics for PDP-8

The CIG-8 Mark II is a software overlay for FOCAL 1969 designed to enable interactive graphics on a non-storage scope for 8-K PDP-8 computers. The manual details the system requirements, installation procedures, usage instructions, and functional descriptions of the display language. It includes technical documentation such as symbol definitions, memory maps, patches, and examples for creating and manipulating graphic displays. Additionally, the document contains the complete assembly source code for the overlay, including the display interpreter and associated FOCAL subroutines for graphing, axes generation, and text handling.