6809 SBC

[Henk Gooijen]

From: "CSquared" <csquared3 at tx.rr.com>
Sent: Saturday, January 30, 2010 4:20 AM
To: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org>
Subject: Re: 6809 SBC

> When I moved from the 6800 to the 6809 (in assembly language - *many* 
> years ago) I was sort of astounded and at the same time very pleased by 
> the way many of the little subroutines I had written for the 6800 became 
> one instruction in the 6809.  I think it will always be my favorite 
> 8-bit CPU.  My only annoyance at the time was the fact that there was no 
> way for the software to reset the companion UART chip, whose number I've 
> completely forgotten by now.  6821 maybe???
> Later,
> Charlie Carothers

I am somewhat a Motorola-guy, so a bit biased :-)   Of the 8 bit CPUs the
6809 indeed would be my favorite. The 6821 PIA (parallel I/O) has the RST*
pin, the 6850 ACIA (serial I/O) does not.

- Henk.