"APL90 was written in C, between 1982 and 1988, at the Ecole des Mines
de Saint-Etienne (France), by Jean-Jacques Girardot, Fran�ois Mireaux
and Sega Sako (with the additional help of a lot of people)" (APL90
Manual). At the time, it was available on most UNIX and UNIX-like
platforms, as well as the Macintosh. However, this is an early
implementation of APL on the Macintosh, and does not take much
advantage of the Macintosh GUI - one can easily see this from the
screenshot. It is essentially a raw port of the UNIX programs to get
APL up and running on the Macintosh. It was compiled with Mac C by
Consulair.
APL (A Programming Language) was developed in the early 1960s by Ken
Iverson and some colleagues at IBM. Mathematically inspired, it makes
use of numerous non-ASCII characters, including some Greek letters.
While APL is probably not considered a mainstream programming
language, it still exists, with a few implementations available for
Mac OS X, such as OpenAPL and J.
Note: The disk images may have incorrect checksums. However, they will
open with Mini vMac, possibly fixing them.
