8-Bit Character Assembly Subroutines

Summary

This document provides technical documentation for the "8-Bit Character Assembly Subroutines" designed for the PDP-8 computer (specifically for the 680 Data Communication System).

Key functions include:

• Data Handling: The subroutines manage the assembly of serial-bit Teletype data into 8-bit characters and facilitate their transmission.
• Requirements: The software requires specific memory allocation (based on the number of Teletype lines), defined tags for buffers/pointers, and a minimum PDP-8 configuration with 680 hardware.
• Pseudo Commands: The document details specific commands for initialization (T8INIT), checking output status (T8SOF), and checking input availability (T8SIR and T8SIE).
• Interrupt Handling: It outlines the necessary interrupt service routines, including clock IOT definitions and methods for managing multiple Teletype lines.
• Implementation: The document provides detailed technical specifications, including memory storage calculations, timing tables, program listings, and flow charts to assist developers in integrating these subroutines into their main programs.