[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>

> >         <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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