"Rick Weiland and I (Bill Gates) wrote the 6502 BASIC," Gates commented on the Page Table blog in 2010. "I put the WAIT ...

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.