[Coco] DS1216

[Gene Heskett]

On Tuesday 22 September 2015 23:31:49 K. Pruitt wrote:

> ----- Original Message -----
> From: "Gene Heskett" <gheskett at wdtv.com>
> To: <coco at maltedmedia.com>
> Sent: Tuesday, September 22, 2015 8:06 PM
> Subject: Re: [Coco] DS1216
>
> > On Tuesday 22 September 2015 21:48:41 K. Pruitt wrote:
> >> > ----- Original Message -----
> >> > From: "Gene Heskett" <gheskett at wdtv.com>
> >> > To: <coco at maltedmedia.com>
> >> > Sent: Tuesday, September 22, 2015 4:58 PM
> >> > Subject: Re: [Coco] DS1216
> >> >
> >> >> On Tuesday 22 September 2015 19:52:05 K. Pruitt wrote:
> >> >
> >> > <snip>
> >> >
> >> >>> > --
> >> >>>
> >> >>> Not to hijack this thread, but rather than start an entire new
> >> >>> thread with no context...
> >> >>>
> >> >>> Anybody have any idea why setclk doesn't disassemble correctly?
> >> >>>
> >> >>> eim? oim? aim? Where are these op codes coming from? Are these
> >> >>> even real?
> >> >>>
> >> >>> L02A5    eim   #$63,$0F,s
> >> >>>
> >> >>> Seriously?  Is this actually legit code?
> >> >>
> >> >> Legit code, but for a 6309?
> >> >>
> >> >> Cheers, Gene Heskett
> >> >> --
> >> >> "There are four boxes to be used in defense of liberty:
> >> >> soap, ballot, jury, and ammo. Please use in that order."
> >> >> -Ed Howdershelt (Author)
> >> >> Genes Web page <http://geneslinuxbox.net:6309/gene>
> >> >>
> >> >> --
> >> >
> >> > Thanks for taking the time to answer Gene.
> >> >
> >> > --
> >>
> >> I found Chris Burke's "The 6309 Book" online. I'm surprised to se a
> >> disassember from 1988 spit out 6309 code. I thought the 6309 being
> >> put in to CoCo's was much later. Also surprised to see the setclk
> >> program written in 1989 contain 6309 code. Some of you guys were
> >> way ahead of the curve.
> >
> > I bought my first HD63C09EP as a kit from Chris Burke.  In about
> > that late 80's time frame.
> >
> > As for the setclk, there should have been in those days, a separate
> > version for each cpu as that code would certainly not have worked on
> > a 68x09.  I doubt if it exists today because of the extremely
> > limited amount of difference it would make since its normally only
> > used by the user to set the clock.  With the right clock, that might
> > be once a day if you were being picky.
> >
> > Cheers, Gene Heskett
> > --
> > "There are four boxes to be used in defense of liberty:
> > soap, ballot, jury, and ammo. Please use in that order."
> > -Ed Howdershelt (Author)
> > Genes Web page <http://geneslinuxbox.net:6309/gene>
> >
> > --
>
> I don't think setclk is disassembling correctly for whatever reason. I
> see no data in this disassembly and there should be, based on just
> looking at the binary with a hex editor. I've placed data at the
> bottom of my code and seen disassembler results like this before. I
> don't think I ever saw 6309 code pop up before. But it does run on a
> 6809 and has been on my CoCo since at least 1990 doing it's thing so
> I'm going to assume the 6309 code in the disassembly is just
> randomness. The disaasembler had to spit out something so it did.

It probably was the data buffer, at least 6 bytes of it because that is 
the size of the time packet maintained in the DP.  And it of course 
needs a wider keyboard buffer than that just to hold what you type.

That is one of the things that sleuth does well, but you have to tell it 
what is code and what is data.  But a good disassembly by sleuth will 
reassemble to the exact same crc.  Most of the others need lots of more 
invasive hand massage to achieve that.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>