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> Acorn computers, creator of the ARM processor.

Whoah! I didn't realize they were the same company!

Fun fact: the ARM 1 was designed using some custom software on a BBC Micro and tested in simulation (sub 1KLOC) before they submitted the design for tape-out and production. First silicon actually worked!

https://en.wikichip.org/wiki/acorn/microarchitectures/arm1

oh sure, design an entire cpu on a 6502 with 128kb of ram, no problem.

It's wild how spoiled we are. The ATmega328p on a $10 Arduino Nano is 10x faster than that

Probably more like 64 KB, assuming 6502 second processor...

(Actual usable space is less! The second processor's onboard OS uses 2 KB. The BASIC interpreter uses 16 KB for its code plus another approx 1.1 KB for workspace.)

Yup. ARM == "Acorn RISC Machine"

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