PATH command for Apple II ProDOS

A Forth interpreter, entirely written as bash script. But by now is yoda (https://github.com/Bushmills/yoda) the better bashforth.

jet simulation in basic

the official cc65 wiki

Davex is a command-line shell for the Apple II family of computers. Davex runs on ProDOS 8, and a subset of functionality is ported to SOS.

The original sources of MS-DOS 1.25, 2.0, and 4.0 for reference purposes

cc65 - a freeware C compiler for 6502 based systems

Multi Tasking OS for Apple IIe //c IIgs