Biorythms is a desktop biorythm plotter. It uses the algorithms
from the old BBC welcome version. It has an option of a BBC style
20 day plot or a plot for the whole month. It defaults to my birth-
day when run (but this can easily be changed in the program as it 
is in BASIC). The Adjust button on the mouse can be used to increment
the days, months and years in 10's, the Select button for 1's (Obviously).

PS Mode 20 sprite again

From : Shaun Burnett