30 Jan
2010
30 Jan
'10
1:32 a.m.
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.