1. they never put a standart rs232 port on their stuff.
sure you could
use 1488's , but that was not the point. There was no real rs232.
They did later with the B series machines and the Plus/4, but it was too
late by then.
2. The disk drives were basically computers to
themselves;
I dunno. I think the drive was fine with it's own CPU. What was a bear
was the slow IEC protocol.
Search for Commodore Trivia and IEC to find Jim Butterfield's
information on why the IEC protocol ended up so slow. If you can;t find
it, let me know, and I will post it here. It's a good read.
3. 40 columns just ain't cool. 80 is the way to
go.
Again, fixed with the B series and the C128, but again, too late.