GUIDO Music Learning System (1996) 0 Audio DOS

First Released in 1986 by the University of Delaware, GUIDO (Graded Units for Interactive Dictation Operations) was self-paced Ear Training instructional software designed by and for use at the University of Delaware. It was originally programmed on a Burroughs 6700 and later ported to the PLATO system, before it was redesigned for use on the IBM-PC/XT/AT.

• 2.1

IBM 3270 PC High Level Language Application Program Interface (1985) 0 DOS

The IBM 3270 Personal Computer High Level Language Application Program Interface (abbreviated "HLLAPI") is a software tool which enables users to develop microcomputer applications that transparently establish 3270 emulation sessions when host data is needed.

• 3.x