An interesting observation. It prompts the thought of how far away this simulator is from an actual ZX81, and how much it has been pulled away from a ZX81 by dint of training data where simulated retrocomputers of other types all boot into copyright messages. I wonder how often the spicy autocomplete engine tried to make it put up a "READY" or "OK" prompt.

One ZX81 clone actually did have a "READY" prompt, I read. Actual intelligence was doing the same in the 1980s. (-:

Almost none of the domain knowledge came from Claude. This is something I did by hand 40+ years ago (an assembler and a disassemble/debugger, which is in parts similar to the emulator)

This time it was almost as fun : 1/8 of the mental effort per line, x 8 the speed.

true - it's an homage to the zx81, ts1000, spectrum and ts2068