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Article #7556

Re: ATT Targa-xx, part 2

#7556
From: John Chapman
Date: Tue, 09 Sep 1986 05:13
71 lines
3406 bytes
We have had news problems so if you have seen a previous posting of these
articles by myself I apologize, but I would like to get any info. that is
floating around out there.
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> > Has anyone out there tried any of these boards with or without AT&T's
> > software?  I'm looking for a review.
> > 
> > Truevision Advanced Raster Graphics Adapter (TARGA):
> > There are several versions of this board.  They all capture in 1/30s from
> > camera or VCR.  Hardware zoom (2X, 4X, and 8X).  Smooth independent vertical
> > and horizontal scrolling.  Bit-pane masking.  "Robust" gen-lock capability.
> > Up to 512 x 420 pixel resolution depending on color depth and model.
>               ^^^
> 
> The vertical resolution is adjustable; mine works fine at 483.
> 
.
.
.
> screen copies possible).  In its standard configuration, the TARGA has
> a non-broadcast horizontal blanking interval; there are black bands
> to the left and right of the picture visible onscreen.  However, an
> option is available to change the timing, making the signal broadcast
> compatible.


 Is this the (~$200) overscan option?
 Are the pixels square without the option? Are they 5/4 (or any other
 'nice' ratio) with the option?

> 
> The documentation is superb.  Many helpful routines are shipped with
> the board (in Computer Innovations' dialect of C, though I've had
> little trouble rewriting them for QNX C).  Between the two, it's been
> very easy to get full function from the TARGA.  The frame grabber is

Could you give a brief summary of the software provided with  the board?

> very accurate, with no perceptible h-shift or field locking problems.
> The output signal is very clean; there are no transients at intensity
> boundaries, and the picture is quite stable.
> 
> Two small problems:  With the exander option installed (to adjust the
> blanking interval) the board is a little wider than one slot.  Also,
> in my case, the genlock failed after several hours operation, due
> to heat I suspect.  It works fine with the cover off the PC, and I
> expect that an expansion box with a fan will solve the problem.
> 
> I have not found much use for the blend capability, and would have
> preferred a graphics overlay channel instead.  I understand this is
> being considered.
> 
> I have alot of software working with this board (z-buffer, utilities, etc.)
> and would be happy to correspond with others about it.
> 
> 		-Steve Miller ihnp4!bellcore!bambi!steve
> 		              Image Space Inc.
> 		              Suite #3
> 		              125 Washington St.
> 		              Hoboken NJ, 07030
> 		              (201) 798-0429

john chapman
{watmath,ihnp4,uw-beaver}!ubc-vision!sfucmpt!sfulccr!chapman


 
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From: chapman@fornax.uucp (John Chapman)
Newsgroups: net.micro.pc,net.micro.att,net.graphics
Subject: Re: ATT Targa-xx, part 2
Message-ID: <3@fornax.uucp>
Date: Tue, 9-Sep-86 01:13:42 EDT
Article-I.D.: fornax.3
Posted: Tue Sep  9 01:13:42 1986
Date-Received: Tue, 16-Sep-86 22:44:37 EDT
Distribution: net
Organization: Computing Science Dept, SFU,  Burnaby, B.C. Canada
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