Organ-AA and Organ-BA

This document provides the documentation and source code for two PDP-12 programs, ORGAN-AA and ORGAN-BA, which allow users to play music on the computer's speaker using the keyboard. ORGAN-AA functions like a standard keyboard instrument, while ORGAN-BA is a simulation that plays a pre-stored melody based on user key presses to control the rhythm. The document includes technical descriptions of how the sound is generated by manipulating bit 0 of the Accumulator to create specific frequencies and provides the PAL III source code for both programs.