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

[Arthur Flexser]

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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