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

[jdaggett at gate.net]

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
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From:           	Mark Marlette <mark at cloud9tech.com>
Subject:        	Re: [Color Computer] Re: [Coco] Hidden 256-
color mode
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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>
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> >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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