[Color Computer] Re: [Coco] Hidden 256-color mode

[Mark Marlette]

At 08:21 PM 7/28/2005, you wrote:


Al H. had the board at the last ChicagoFest. I got to see it. You better 
give yourself more than a week. It took a development team a to develop 
that board and for a single person to reverse engineer it will take ten 
times as long.

Mark




>On 28 Jul 2005 at 23:55, James Diffendaffer wrote:
>
>To:                     ColorComputer at yahoogroups.com
>From:                   "James Diffendaffer"
><jdiffendaffer at yahoo.com>
>Date sent:              Thu, 28 Jul 2005 23:55:16 -0000
>Subject:                [Color Computer] Re: [Coco] Hidden 256-
>color mode
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>
> > I think the best way to determine if the 256 color mode is in the GIME
> > is to examine the prototype and learn how to turn it on... then test
> > the GIME with working code.
> >
>
>I can't agree more here. I would love to have a week with that
>board. I used to design hardware prototype boards for software
>engineers to develope software on. It would be a treat to examine
>this one.
>
> > It would be interesting to compare dies of the GIME versions.
> >
> > I'm not sure removing the mode from the die would result in
> > significant cost savings since it looks like a simple design.  It
> > appears that the data sent to lookup colors just bypasses that phase
> > and goes strait to the output through an additional register.  That
> > means there could only be a couple additional gates to sense state to
> > turn it on and disable the other data path.  It even requires a reset
> > to disable.  It can't require a lot of chip realestate.  What it
> > translates to on the die who knows.  A register, an and gate or two
> > and a flip-flop could be expensive.
> >
> >
>****
>
>If they were usig a lookup table to do psuedo color then yes that
>would take up a bit of real estate. On the prototype board is a 512
>byte sram chip. It happens to be located near what appears to be
>the composite video out and sound connectors.
>
>*****
> >
> >
> > >> The possibilies I see are:
> > >> yyyyyrgb - 8 colors with 32 levels of intensity
> > >
> > >****
> > >
> > >first off this format will yield three colors and 32 levels of
> > > intensity.
> >
> > RGB
> > 000 - 1
> > 001 - 2
> > 010 - 3
> > 011 - 4
> > 100 - 5
> > 101 - 6
> > 110 - 7
> > 111 - 8
> >
> > Or am I missing something?
> >
>
>
>My fault there. Old age brain fart.
>
>james
>
>
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