newbie tech - dim colours

[smartbloke@fastmail.fm]

[ukvac] newbie tech - dim colours
Trying to wire up an adaptor to play a Super Qix bootleg in my Universal
Mr. Do cocktail cab.
Have it pretty much working [ no sound yet ] except for the colours ...

All the colours seem correct - i.e. everything which should be red is
red, green is green, blue is blue but some of the colours appear dimmer
than they do if I run up the Super Qix bootleg in mame, e.g. the
background of the screen when playing the game in mame is a lightish
blue, when playing on my cab the background is blue - but it is such a
dark blue that it is only just different from the black.

My question, basically, is what could be causing this ;-
1) Is there a difference between the colour outputs from the board and
the colour outputs my cab is expecting ?
2) Can mame be used as a colour guide ?
3) Can I put this down to a fault on the board ?

I seem to recall someone once mentioning pos and neg sync signals but I
can't remember the details - would this have anything to do with it ?

Anyway, I only have the Universal cab that I can test this in - so any
suggestions much appreciated.

Ta,
smartbloke

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smartbloke@fastmail.fm

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[Macro]

RE: [ukvac] newbie tech - dim colours
2) Can mame be used as a colour guide ?

If you have a board and it differs from Mame, it's more likely that the
board is correct.

3) Can I put this down to a fault on the board ?

just check that your video ground is wired correctly, thats the most common
reason for video faults. (check it with a meter, I've had boards where the
video ground pin isn't actually connected to ground!)

>I seem to recall someone once mentioning pos and neg sync signals but I
>can't remember the details - would this have anything to do with it ?

This is just the sync, if you have your monitor set for one (if it's
switchable), and the board puts out the other you will have great problems
getting a stable picture.

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