Jules Richardson wrote:
  Out of interest, were there many manufacturers who
sold a system with
 three different CPUs as standard? There were a few around with two, I
 know... 
But what with different CPU's could you run? Looking back in hind sight
the only OS out there was CP/M for the 8080. All the rest just seemed
to have BASIC in ROM and some way of saveing programs.
  (Torch came close, I suppose, but as they didn't
make the BBC side of
 their systems themselves I'm not sure that they count!) 
I know somebody had planned a 6100 for use as CPU board but I forgot
who. That reminds me now that I got a PDP-8 clone I am going have to
learn how to use it. So what is the best way to learn OS/8? I still
can't get over how many features this has considering the size of the
PDP-8 for memory.
  cheers
 Jules.