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

[Luis Antoniosi (CoCoDemus)]

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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> >
>
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