I have been told, but never tried myself that the 6809 acts as a 16-bit
counter on the address lines when it finds two data bits shorted
together.
The 68000 was said by the same guy to "pull the pins out of the socket",
i.e., make all outputs high-Z.
Tom Uban wrote:
>
> I worked with a 6809 system back in the early 80s which
> had an LED board to display the state of all of the system
> signals. I don't recall the OP code, but there was one
> which would continuously cycle the address, data, and
> other signals until reset. It made the LEDs light up
> like a christmas tree.
--
Andreas Freiherr
Vishay Semiconductor GmbH, Heilbronn, Germany
http://www.vishay.com
Received on Fri Jun 07 2002 - 13:15:34 BST