Teaching kids about computers...

[John Honniball]

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.

> -tony

-- 
John Honniball
coredump at gifford.co.uk