I'm looking for a reference for a command which used letters for musical notes, and would play very simple tunes with square waves. It ran on an IBM AT, circa 1984, which was running a version of IBM/MS DOS. This hardware had a simple timer to control the speaker. Circuit diagrams etc were in the Technical Reference manual (PDF) (pages 1-30, 1-76, 1-77).
The notation was something along the lines of
- A single string of ASCII characters
- Something indicated the tempo
G#played a note
- There were characters for "go up/down" an octave
- There was some way to indicate amount of staccato
Do you know what it was?