Programmed Buffered Display

The Type 339 is an advanced incremental CRT display designed to interface with the PDP-9 via a Direct Memory Access (DMA) channel. It operates as a multi-processor system, sharing core memory with the PDP-9. Key features include:

• Performance: High-speed point and vector plotting with multiple scale and intensity levels.
• Standard Accessories: Includes a light pen and a push-button function box for interactive user communication.
• Advanced Logic: Features automatic scissoring, zoom logic, and optional support for a character generator, search logic, and slave mode for multiple displays.
• Programming: Executes instructions directly from lists stored in PDP-9 memory, operating in both control and data states to manage drawing and display parameters.
• Flexibility: Designed for applications such as automated design, information retrieval, and computer-aided instruction, functioning as either a stand-alone system or a buffered terminal.