Cromemco Dazzler troubleshooting...

Bill Sudbrink wh.sudbrink at
Fri Sep 7 17:50:44 CDT 2007


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.

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