6809 SBC

[Tony Duell]

> I seem to remember having to send three consecutive software reset
> commands to something or other, quite possibly 6850:s, and probably
> Motorola ones. If you sent only one, the chip did not reset, you had to
> send three at once.

That sounds more like the Intel 8251 USART. IIRC on that chip you have to 
send the reset command 3 times to ensure it's treated as a command and 
not as data to be loadrd into one of the configuration registers.

-tony