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

[Mark Marlette]

At 01:20 PM 7/29/2005, you wrote:

Al needs to get this board to you then. Taking the red dots off and getting 
the chip numbers will take no time at all. There are A LOT of PALS on the 
board. But even at 4x, you'll be done in a month. That is still very quick.

Mark

>Mark
>
>If I have pinouts of all the ICs on hand at the start,  I will  have a
>schematic of that board with in a week. The only thing that would be
>a problem is the PAL chips on board. That will be a bit to decipher
>their function.
>
>james
>
>
>On 29 Jul 2005 at 7:57, Mark Marlette wrote:
>
>Date sent:              Fri, 29 Jul 2005 07:57:51 -0500
>To:                     CoCoList for Color Computer Enthusiasts
><coco at maltedmedia.com>
>From:                   Mark Marlette <mark at cloud9tech.com>
>Subject:                Re: [Color Computer] Re: [Coco] Hidden 256-
>color mode
>Send reply to:          CoCoList for Color Computer Enthusiasts
><coco at maltedmedia.com>
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>
> > 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
> > >Copies to:              Send reply to:
> > >ColorComputer at yahoogroups.com,
> > >         CoCoList for Color Computer Enthusiasts
> > ><coco at maltedmedia.com>
> > >         <mailto:coco-> >request at maltedmedia.com?subject=unsubscribe>
> > >         <mailto:coco-> >request at maltedmedia.com?subject=subscribe>
> > >
> > > > 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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> > > >
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