Cromemco Dazzler troubleshooting...

[Roy J. Tellason]

On Friday 07 September 2007 18:50, Bill Sudbrink wrote:
> Hi,
>
> I have a Dazzler board set that _almost_ works.
> Gray scale looks good and color looks OK, except
> that it's gray too.  The shades of gray change
> when I flip the color bit at I/O address 0x0F and
> the red and green pots and the blue variable cap
> change the display when in color mode.  The monitor
> I'm using is tested good with a color CCTV camera
> I have lying around.  The geometry changes as
> expected with bit changes at 0x0F and the "dots"
> change as expected when the memory at the address
> assigned at 0x0E is modified.  My guess is that
> something is wrong in the color burst (is that the
> right name?) circuit?  Or is it possible that there
> is something different about the signal that a newer
> (manufactured Jan. 1993) color monitor wouldn't like?
> Unfortunately, the scan of the Dazzler manual on the
> Harte Technologies web site is not at a high enough
> resolution for the schematics to be read in detail.
> A better scan of the schematics would be greatly
> appreciated as would any other help, video signal
> generation is not my strong suit.

Got a scope?  That's the best way to look at the output signal,  and work your 
way back into it until you find out why there's no colorburst in there...

-- 
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space,  a critter that can
be killed but can't be tamed.  --Robert A. Heinlein, "The Puppet Masters"
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