In message 
<of47993c5c.2a1c8651-on882572b8.005b87b7-882572b8.005da...@selinc.com>, 
dated Mon, 9 Apr 2007, [email protected] writes:

>While there may be some sort of signal that indicates the start (or 
>end) of a vector scan sequence, it is not a fixed frequency sync signal 
>as used with a raster scan display.

I think this is why 'pen down' may work when the z-blanking signal 
doesn't.
-- 
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
There are benefits from being irrational - just ask the square root of 2.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

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