My take on the hex-vs-octal 8080/Z80 debate:
My gosh, it doesn't take a mental giant to subdivide an 8 bit quantity into
either octal or hexadecimal! Hex is attractive for 8 bits in that there's
no "hole" to deal with in 16/24/32... bit quantities (although that can be
accomodated with application of a bit of grey matter).
Another reason I like hex for 8 bits is because I can output a line of 16
bytes in a dump format, complete with address and alpha translation on a
single 80-character line. Heaven knows why ZSID went to a two-line format
to do that. But if all you've got is octal, no problem, I can deal with
that, too. Or decimal, for that matter.
If you think that hex-vs-octal is hard mental work, try transposing musical
notation on the fly...
Cheers,
Chuck