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

[James Diffendaffer]

After checking the GIME pinouts, pins 65-68 are Composite, Red, Green
and Blue.  So, does that mean the video DAC is internal???  If so then
if it's in there it would be 256 colors.

Since all address and data lines go through the GIME I think the
shortage of pins doesn't make any sense.  Shortage of bits in
registers would make sense so my comment was probably wrong.

Now, something else to mull over.  There is a pullup on pin 38. 
Anyone know what this pin actually does???  I'd think it would be +5v
or GND unless it has some specific function.

--- In ColorComputer at yahoogroups.com, "James Diffendaffer"
<jdiffendaffer at y...> wrote:
> If they left the mode in the die but the control line(s) for intensity
> off of the chip it should still have a 64 color mode with the
> intensity bits ignored.  ;)
> 
> >> The possibilies I see are:
> >> yyyyyrgb - 8 colors with 32 levels of intensity
> >> yyrrggbb - 64 colors with 4 levels of intensity
> >> 
> >> I think the last one makes the most sense and would be most usefull
> >> for games.  It still works within the 64 color palette of the CoCo
> >> but with intensity.
> >
> > Now, that is an interesting idea...  I wonder if they might have
> > just hooked the two intensity bits to some video amps that might
> > then have been left-out of the final board design?  Well, it's an
> > idea anyway... :-)
> >
> > I don't suppose there are any unused (or otherwise likely) pins on
> > the GIME?  Probably not...
> >
> > John
> > -- 
> > John W. Linville




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