Abacus Super Pascal 64 for the Commodore 64. Most people associate the Commodore 64 with Commodore BASIC and precompiled applications, but it also had a number of alternative development environments ...
Once upon a time, you might have developed for the Commodore 64 using the very machine itself. You’d use the chunky old keyboard, a tape drive, or the 1541 disk drive if you wanted to work faster.