Teaching kids about computers...

[Sean Conner]

It was thus said that the Great John Honniball once stated:
> Tony Duell wrote:
> >The 6809 and 6502 buses are _very_ similar (read 'E' for 'Phi2', 
> >basically ;-)). Most I/O cards would work with either CPU (hence the lack 
> >of problems in haveing a 6809 CPU in a System).  Of course the 
> >instruction set, and thus firmware/software are very different.
> 
> I've successfully installed a 6809 in a previously 6502-based
> machine: the Compukit UK101.  I had to write new EPROM-based
> firmware for it, of course.  As far as the bus and I/O devices
> are concerned, it Just Works.  Even the pinout is similar enough
> that the socket adaptor is easy to build.

  I seem to recall that the original Apple I had a jumper that selected
between a 6502 and a 6800.  The ony reason that Apple used the 6502 was
price.

  -spc (or so I've heard ... )