[Coco] [OFF] Hitachi MB-6890 information needed

[Luis Antoniosi (CoCoDemus)]

Well it turns out that the invalid op trap helped much more than you think.

Since invalid ops will trap, just run all the possible permutation of bytes
and take note of the ones that do not trap and are not listed on motorola
datasheet. Now your job became much more easier ;)



On Tue, Apr 22, 2014 at 4:53 PM, Arthur Flexser <flexser at fiu.edu> wrote:

> I agree, that's the first thing you'd notice, the only apparent difference
> in behavior between the 6809 and the 6309 running in 6809-emulation mode.
>
> But suspecting the existence of hidden features on that basis is a lot
> different than discovering them in the level of detail that was published,
> which is what makes me think that a leak from Hitachi probably helped.  If
> not, whoever wrote the original Japanese paper that was translated and
> summarized by Hirotsugu Kakugawa  was one hell of a talented and
> dedicated detective!
>
> Art
>
>
> On Tue, Apr 22, 2014 at 4:39 PM, Luis Antoniosi (CoCoDemus) <
> retrocanada76 at gmail.com> wrote:
>
> > executing invalid op codes on 6309 makes it to trap. The 6809 will be
> > wandering between those invalid codes until it finds valid ones. This is
> > what raised some eye browns about the 6309 extra functions.
> >
> >
> >
> >
> > On Tue, Apr 22, 2014 at 4:12 PM, Arthur Flexser <flexser at fiu.edu> wrote:
> >
> > > I'm sure Hitachi would indeed claim that the features were found by
> > hackers
> > > and not leaked by any employee, in order to avoid any disputes with
> > > Motorola.
> > >
> > > Art
> > >
> > >
> > > On Tue, Apr 22, 2014 at 4:08 PM, Bill Pierce <ooogalapasooo at aol.com>
> > > wrote:
> > >
> > > >
> > > > You are right Art, here is a link to the original English translation
> > of
> > > > the article by Hirotsugu Kakugawa, but it also states that even
> Hitachi
> > > > admits that some hackers found the secret features of the chip.
> > > > >From this document, our current tables and charts of the 6309 were
> > > > spawned.
> > > >
> > > > ftp://maltedmedia.com/coco/INFO/6309memo.txt
> > > >
> > > >
> > > > Bill Pierce
> > > > "Today is a good day... I woke up" - Ritchie Havens
> > > >
> > > >
> > > > My Music from the Tandy/Radio Shack Color Computer 2 & 3
> > > > https://sites.google.com/site/dabarnstudio/
> > > > Co-Webmaster of The TRS-80 Color Computer Archive
> > > > http://www.colorcomputerarchive.com/
> > > > Co-Contributor, Co-Editor for CocoPedia
> > > > http://www.cocopedia.com/wiki/index.php/Main_Page
> > > > E-Mail: ooogalapasooo at aol.com
> > > >
> > > >
> > > >
> > > >
> > > > -----Original Message-----
> > > > From: Arthur Flexser <flexser at fiu.edu>
> > > > To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> > > > Sent: Tue, Apr 22, 2014 3:25 pm
> > > > Subject: Re: [Coco] [OFF] Hitachi MB-6890 information needed
> > > >
> > > >
> > > > I think a more accurate history is that there was a Japanese magazine
> > > > article about the 6309's extra registers and other features, which
> got
> > a
> > > > great deal more attention a couple of years after it was published
> when
> > > > someone translated it into English and it became available online.
>  The
> > > > article contained very great and accurate detail about the 6309,
> which
> > to
> > > > my mind makes it implausible that it was simply the product of
> > someone's
> > > > experimentation and detective work.  I strongly suspect that the
> > > > information was leaked by someone at Hitachi.  I'm sure the Hitachi
> > brass
> > > > were terribly upset about that.  (Oh, no!  Now people will realize
> that
> > > the
> > > > 6309 is more powerful than the 6809, and we'll probably sell way more
> > of
> > > > them than we expected.  Dang it all!!)
> > > >
> > > > Art
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > --
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> > > > Coco at maltedmedia.com
> > > > http://five.pairlist.net/mailman/listinfo/coco
> > > >
> > >
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> > >
> >
> >
> >
> > --
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> >
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