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The A3000 series can output a variety of video signals.  Like every
other Amiga, it has a 15 Khz RGB Analog port, suitable for attaching an RGB
monitor like the Commodore 1084 series.  This port can also be used for a
video encoder like the Commodore A520 modulator for composite and RF
signals, and for genlocks, like the SuperGen.  It's also usable for video
system hacks like the DCTV paintbox.  15 Khz monitors, while cheap, are
really a pain because of the interlace flicker.  One port the A3000 doesn't
have, is the mono composite out found on the A500/2000, or the colour
composite jack on the A600/1200.

The A3000 also has a special Amber deinterlacer circuit, which can
output clean 31.5 Khz RGB Analog video too.  This is similar to VGA, and
you can attach a PC VGA monitor to this port with no trouble.  This port
scandoubles or deinterlaces the 15 khz signal in hardware, unlike the AGA 
DoubleNTSC mode.  This means no speed degredation, and no extra DMA bandwidth.  
It also has no effect on NTSC: applications, such as the VideoToaster, but
means you can run the Switcher or CG flickerfree.

VGA type devices can also be added to the A3000 deinterlacer
output, including VGA/Composite adapters and LCD projection panels.

Most A3000 owners should pick up a multiscanning PC SVGA monitor.
You'll want it to be compatible with 50 Hz refresh (VGA level is 60 Hz) for
PAL compatibility, and also higher resolutions, if you purchase a graphics
card in the future.  Some will suggest a full 15 Khz multiscan monitor like
the Commodore 1950 and 1960, but the added expense and trouble (both are
known to have reliability problems) aren't worth the benefit of having a 15
Khz fallback.  The deinterlacer already upscans any NTSC signal anyways.  

Finally, the A3000, with its ECS chipset, can generate VGA level
signals in a method similar to the AGA systems.  Modes such as
Productivity: raise the Amiga sync rates, while using up DMA bandwidth and
slowing the machine down.  It's probably not a good idea to use these
modes, but they can be generated.  The signal will come out of the 31 Khz
deinterlacer port, but the deinterlacer will just pass it through
untouched.  The signal also comes out the DB23 video port simultaneously.