It's certainly impressive, but not extraordinary by the standard of the day for a good programmer. I once stuffed a software UART, simple command interpreter a

It's certainly impressive, but not extraordinary by the standard of the day for a good programmer. I once stuffed a software UART, simple command interpreter and a temperature control algorithm into a microcontroller that had a single accumulator and a grand total of 504 bytes of OTP Flash (a donut to anyone who can guess what it was from that odd memory size :-) and didn't give it a second thought until years later someone pointed out that it was unusual.