Bar Chart Plotting Subroutine

This document is a technical manual for the Bar Chart Plotting Subroutine (DECUS No. 8-279), authored by G. L. Kermez and W. G. Peters of Texas Instruments Limited. Written in MACRO-8, this subroutine was designed as part of a power transistor test system to visualize data distributions on a teletypewriter (TTY).

Key features and operational details include: - Configuration: The subroutine uses 7 octal constants to define the table location, number of readings, search increments, number of classes, Y-axis increments, and the overall class range. - Functionality: It allows for the creation of multiple charts from a single set of data without modifying the source table, enabling the generation of a family of charts with different parameters. - Dependencies: It requires ASR33 service routines (TYPE and CARLF) and includes built-in routines for integer division and decimal printing, which are available for other program tasks. - Flexibility: The document provides illustrative examples (Figures 1-4) showcasing how varied axis values can modify the resulting bar charts. - Technical Note: The simple nature of the integer division subroutine employed may result in errors when handling very large numbers, which the authors suggest mitigating through careful axis value selection.