1 Dec
2007
1 Dec
'07
4:09 a.m.
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