Here is the Apple ][ / ][+ version of the "Boing!" demo for the
Amiga.
 
For those unfamiliar with that program, this program displays a
solid sphere rotating in three dimensions and bouncing like a
ball, with sound.
 
It is in EXECUTIONER 4-BIT packing, so you all should be able to
download it. It is 15 blocks as an EXEC file, 8 blocks for real.
It takes about 2 minutes to KERMIT it at 1200 baud.
 
To throw in some magic words, the program uses reduced-flicker
animation of a sphere that has been transformed in 3-d and
rendered in 2-d using a z-buffer algorhythm. Initial generation
of the sequences was executed with 10-digit math (far beyond the
resolution of the screen for no readily apparent reason.)
 
This is V1.1. Version 1.0 had no sound, and no speed control.
V2.0 has been designed, but not yet fully implemented, and
includes digitized sound and more color.