🚀 go-pugleaf

In 1986 I worked for a company that had a DEC wordprocessor which turned
out to be a PDP-8. One day a DEC-technician arrived to repair something
in the machine.

To my surprise the machine still had core in it. When the repair was
finished, the technician asked if we were interested in a special demo
program he had. Sure, we're always interested.

The technician took an AM-radio from his toolbox and installed it next
to the machine. He tuned in on a certain frequency indicated on the
radio. Next he removed some panels from the PDP-8, uncovering the core.
He started a program from floppy which provided a menu from which you
could choose a song. You also had to specify the kind of terminal and
what type of floppy-drives were connected to the machine.

Then, we could hear the song on the radio!! The two DX-type floppy drives
ware mistreated as drums (they make an awful noise when the head is
loaded on the floppy!). The program also transmitted CTRL-G's to the
terminal to have it behave as another instrument.

One of the most spectacular demo's I've ever seen.
Actually it is very simple: the core generates interference when it is
accessed. All your program has to do is to access the core in such a way
that the correct interference is generated. The only problem is that
your program also resides in the core, so any changes to the program may
change the core's access-pattern, and subsequently changing the notes.

Rob.