Also, it’s a minor thing, but a carry out from addition is actually slightly faster than all Boolean logic for XOR.

So

(X+Y)-2*(X AND Y)

I actually did a benchmark on this some years ago. Pedantic I know.

https://imapenguin.com/2021/06/quick-post-xor-in-commodore-basic-2/

The table on p75 could use a sentence of explanation. I understood it fine as if you need this, then do this. But some people might get confused.

I have the spiral bound first edition within arms reach at all times. Looking forward to this one in print. Outstanding work.

This actually dumps right to the machine monitor after about 60% of the title screen is printed on my MiniPET 40/80

You had me at "Procedurally Generated"