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.

You don’t need to go searching for a Commodore 64 on Ebay to relive the vintage PC’s glory days. Avid gamer Petri Wilhelmsen is providing a way to write and run C64 programs on Windows PCs for ...