[Coco] 6309/6809 opcodes with mixed 8/16 bit registers

[Mike Pepe]

> -----Original Message-----
> From: coco-bounces at maltedmedia.com [mailto:coco-
> bounces at maltedmedia.com] On Behalf Of William Astle
> Sent: Thursday, November 22, 2012 9:19 PM
> To: coco at maltedmedia.com
> Subject: Re: [Coco] 6309/6809 opcodes with mixed 8/16 bit registers
> 
> On 12-11-22 09:55 PM, Mike Pepe wrote:
> > I could have sworn the HCF on the 6809 was $FF. I recall that if you
> > were to take a 6809, stick it on a breadboard, give it power and clock
> > it'll run the address bus test routine- the data bus should float to
> > $FF if it's not connected...
> >
> > Hm, I should (re?) try that. I'm certain I've done this before.
> 
> $FF is STU extended so it's definitely not HCF.
> 
 
Yeah- I can give this a shot next time I clean the bench off and see what
happens. :)