> I can't be the only person to start my low level programming
> career with a ZX81, armed only with a manual and a hex editor

My very first exposure to a major construction project and personal
computing was the ETI-660. In at the deep end

http://mattmik.com/eti-660/

Based on the RCA 1802. Still have it

All programming was in hex through the keys. (remember hex
listings in magazines like Compute ! No downloads in those days)

After that introduction the fully-featured Commodore 64 was a
relative doddle to do assembly on, and 68HC and PICs after that

Joe
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