jc@crosfield.co.uk (jerry cullingford) (04/29/91)
Help! I have the following system:
Amiga 2000 (rev 4.1)
Microway Flickerfixer
Microway DEB with genlock compatibility option
and I'm trying to get it to work with a genlock, in PAL, (as i'm in the UK).
So far, I've tried it with two genlocks - a Rendale 8802, and a minigen.
In both cases, (with the Flickerfixer in the extender),
(1) With no genlock connected, the FF display is fine. (So I must have
installed the extender correctly, right?).
(2) With the genlock connected, the genlocked image is fine,
but the FF display is wrong. It's stable, whereas without the
extender it went totally crazy, but alternate lines are displaced
form each other by around (slightly under?) a character width
(see diagram below).
* * *
* * *
* * *
* * *
* * *
* * *
should be appears as or like this
with the minigen (which is a bit flaky and only displays non-interlace
(even if the screen is supposed to be interlaced, it still only displays
one of the two fields, so you lose every other line)), the FF picture is
rock steady (and wrong), and you can see the comblike effect of the
displacement on each side of the display area.
with the rendale, (which does do interlace properly), the displacement
appears to be about the same, but shimmers, presumably because it's
alternating between the two states above.
Adjusting the flickerfixer pot makes no difference; tweaking the capacitor
as per the DEB instructions doesn't change the effect either.
I assume (total guess!) that somehow the genlock sync is used to reset the
flickerfixers idea of where in the line it is, and that something is
screwing up either the start time of the second FF output line (since it
does 2 for each input line) or the start of input line timing between each
pair of input fields that the FF samples into its memory.
Microway UK seem to be stumped at the moment, and their list of genlocks
that are supposed to work are apparently based on NTSC tests,
so,
(1) Does anyone know if Microway US (Who presumably designed the FF) are
on the net so I can email them for help?
(2) Has anyone managed to get a FF to work with a PAL genlock, and if so,
which model?
(3) Anyone else had similar trouble (or been able to get it to work?)
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| Jerry Cullingford #include <std.disclaimer> +44 442 230000 | ,-|--
| jc@crosfield.co.uk (was jc@cel.co.uk) or jc@cel.uucp x3203 | \_|__
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