PCMdmo - Demonstration Program for Pulse Modulation © 1981 Hewlett-Packard
SOFT ID: 11.9512
Published trough the HP Exchange Library Software publishing platform. The principle was simple: If you needed one of the software packages, you could either contribute your own software and get three programs of your choice for free, or you had to pay a nominal transcription fee of $25.
Soft's package.