Frequency and Period Measurement Options for Af04a and Aa50-a Digital-To-Analog Conversion Subsystem

This document provides technical specifications and programming instructions for specific AF04-A and AA50-A hardware modules used with a computer system (such as the PDP-8/E).

Key sections include:

• AF04-A Operations: Details commands for data acquisition, including reading data, clearing flags, and managing bit-level transfers. It outlines the frequency and period measurement capabilities, including technical specifications for sensitivity, impedance, accuracy, and time base stability.
• AA50-A Digital-to-Analog Subsystem: Describes a general-purpose, program-controlled DAC system. It explains the system's architecture, including its interface with the computer, mounting, and output specifications (0 to ±10V).
• Programming Instructions: Provides a list of specific IOT instructions (with octal codes and execution times) for both AF04-A status management and AA50-A DAC channel selection.
• Additional Hardware: Briefly mentions expansion options for the AF04-A system and provides an overview of the AA05-A and AA07 expansion units for increased DAC channel capacity.