Bob Fraser worked at Atari for four years: he worked on the
early CX70 light pen, helped write the specs for an unreleased
database manager for the Atari 8-bits. and later moved into Atari's
Games Design Research Group under Alan Kay, where he experimented
with 3-D graphics. He wrote a chapter of De Re Atari — chapter 7,
all about sound — and two applications that were published by Atari
Program Exchange: Supersort, a data sorting routine; and Insomnia,
a sound editor.
Supersort was APX catalog number 20030, and was for sale starting
with the first APX catalog, summer 1981. Insomnia was catalog
number 20073 and was available about six months later in the winter
1981 catalog.
The CX70 light pen: it's rare — according to AtariWiki, it was
only offered by Atari for a few months in 1981. After our
interview, Bob sent me his: prototype #2. He also sent me a lot of
floppy disks (around 70) which I was able to get the data off of.
They include many of his 3-D rendering demonstrations, source code
for an early version of the Ballsong demo, several early versions
of Mike Lorenzen's MEDIT text editor, light pen software, internal
development tools, and more. I've put them all online, have fun
digging through them.