POOL.BA INSTRUCTIONS CLUB 100 Library - 415/939-1246 BBS, 937-5039 NEWSLETTER, 932-8856 VOICE POOL is a machine-language pixel graphics demo based on an idea of Ken Marks's (see "Designer Screens" in the June '84 issue of 80 Micro): you watch the path of a perfectly elastic pool ball as it bounces around a rectangular table. Two "gimmicks" give the resulting graphics surprising complexity: 1) While the ball moves in the northwest screen quadrant, mirror images of it also move simultaneously in the other three quadrants. When the quadrants overlap (you choose the size), the resulting "interference" patterns can be astonishing. 2) The balls "flip" the pixels in their paths: that is, they turn "on" pixels "off", and vice versa. POOL is a BASIC program - just RUN it & respond to the prompts. It creates a machine-language subroutine below HIMEM, so it shouldn't interfere w/ other ML programs. CAUTION: POOL is written for the M100 - DO NOT attempt to use it on the M200! While the balls are moving, the following keys are active: ESC: hit "ESC" to return to the BASIC program. s: hit "s" (lowercase!) to "freeze" the display. The display will remain frozen until you hit "s" again, or ESC to return to BASIC. 1-9: POOL can move the balls at one of 9 speeds. Hit a number key to change the speed. Speed "1" is the slowest, and CRAWLs. The speed roughly doubles from each number to the next; speed 9 is really too fast to follow. The program begins at speed 6. Hint: choose the table dimensions so that the quadrants overlap; also helps to make the horizontal dimension ALMOST a multiple of the vertical dimension. If you find a particularly breathtaking configuration, share it!...Tim Peters Further notes by Rick Mendosa: Here are some of my favorite patterns: 155/63/39/13; 150/63/39/13; 152/63/13/39 and especially 131/43/anything/anything. Also 237/59/0/0; 212/55/0/5; 238/60/0/0. The best patterns come when you close your eyes to go to sleep. At least for me, the afterimages jumble together fantastically. Try it with abstract music like Philip Glass's Koyaanisqaatsi in the background.