One of my favorite retro projects in this real-time TRS-80 (Model I assembler and emulator that assembles and runs Z80, literally with each key press. Mind boggling how today's CPUs can emulate and entire 8-bit computer dev-process all between key presses in a browser. https://www.teamten.com/lawrence/projects/assembly-language-...." The author even says "How about: With every keystroke in the IDE’s code editor, we assemble the whole program, reset a virtual TRS-80 to a known state, install the program, and run it??