Caterpillar (BRB version)

Caterpillar was originally written for AstroBASIC in 1983. It appeared in two newsletters:

NIAGARA B.U.G. BULLETIN, 1.7 (September 6, 1983): 8-10.
ARCADIAN, 6.10 (Aug. 24, 1984): 95.

There was a revised version, by Klaus Doerge, which was published in 1986:

ARCADIAN, 7.4 (Aug. 15, 1986): 84-85.