Re: Kit-Based Lisa

Also, I forgot to mention, I was hoping to somehow duplicate the keyboard and mouse

On Mar 18, 3:38 pm, Kevin Keith <krfke..._at_email.domain.hidden> wrote:
> OK! Thanks for the help!
>
> On Mar 18, 3:11 pm, Ray Arachelian <r..._at_email.domain.hidden> wrote:
>
>
>
> > Kevin Keith wrote:
> > > The only parts that won't be like the real Lisa is the floppy drive
> > > and the video.  Other than that, it will be exactly the same.  Unless
> > > someone here knows where I can find a GCR floppy drive, I think this
> > > makes the most sense.  Also, does anyone know if the technical
> > > documents for that COP421 is?
>
> > I don't know enough about the real COP421 to answer that, however both
> > the set of functions of the GCR floppy and how the 68K sees the COP421
> > are documented in the Lisa Hardware Guide.  Also, the Lisa schematics.  
> > So start there.
>
> > The HWG has full documentation on the 6504 floppy.  You could build a
> > circuit that does the same kind of thing.  If you can figure out how to
> > adapt a 1.44 floppy drive to encode GCR, and you probably could - for
> > example the CatWeasel controller allows for Macintosh floppies to be
> > read by a PC controller and takes care of the multi-speed translations,
> > you could even get GCR compatibility.  You might want to add a solenoid
> > and mechanism to push the eject button and you'll have the auto-eject.  
> > You'll also want to look at Inisde Mac for Sony 400K details as the 1983
> > HWG refers to the twiggy drives.
>
> > If you do go with a full COP421 - say you find the way to dump the code
> > inside one and say you can find all of its documentation, you'll still
> > need at that point to either build an interface to the mouse and
> > keyboards you wish to use.  So it's probably best to ignore that path,
> > and build something that behaves the same way as the 68K expects the
> > COP421 to behave.
>
> > Of course having a copy of the actual COP421 code will help far more.
>
> >http://pdf1.alldatasheet.com/datasheet-pdf/view/8264/NSC/COP421.html
>
> > But start with the Lisa HWG - specifically the 1983 version.- Hide quoted text -
>
> - Show quoted text -
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