OMG. Can you imagine publishing Machine Code for Beginners today??

Usborne 1980s Computer Books

@paco

On the first computer I used with any regularity, I entered machine code via a hex keypad into its RAM--all 256 bytes of it.

That was an RCA COSMAC ELF single-board computer.

I was around 10 years old.

Assemblers and assembly language are luxury in comparison.

@johnlogic you got me beat. My first was a commodore VIC20. 20 Kb of memory. Of which 3600 or so was RAM.
@paco I don't know the VIC-20 that well. I moved up to an Atari 800 when they were sold fully loaded with 48 kiB of RAM. It also included 10 kiB of OS ROM, where 2 k was just the character set bitmaps.