One difference was the use of flat vs round toggle
switch handles.
The
round handles cut into your fingers and made them SORE
after toggling
in
long programs. My first Altair was a 8800 but had the
flat handles as
used
on the A model. Steve Gabley (sp?) was tracking Altair
serial numbers
and
differences. He said that my Altair was the highest
known SN for an
8800
and one of very few 8800s with the flat handles. You
should check
with him,
I'm sure that he could tell you a lot more about
the differences.
At least some 8800a systems had the round switches. . . like mine.
Erik S. Klein
The Vintage Computer Forum
www.vintage-computer.com/vcforum