Conference wrksys::alphastation

   Different dot pitch -- otherwise, it looks compatible...

 1    VRC21-W3  3    21"(19.6"VIEWABLE IMAGE SIZE)HIGH-RESOLUTION COLOR MONITOR
                     DIAMONDTRON CRT,0.30MM APERTURE GRILL PITCH,VGA TO
                     1600X1200@75HZ,MPRII,ENERGY STAR,HD15 MALE TO MALE VIDEO
                     CABLE,NORTHERN HEMISPHERE OPERATION,FROST WHITE ENCLOSURE

 3 SN-VRCX1-W3  3    21"(19.7"VIEWABLE IMAGE SIZE)HIGH-RESOLUTION COLOR MONITOR
                     DIAMONDTRON CRT,0.28MM APERTURE GRILL PITCH,VGA TO
                     1600X1200@75HZ,MPRII,ENERGY STAR,TCO92,HD15 MALE TO MALE

>>>   Different dot pitch -- otherwise, it looks compatible...
                ---

Correction!  Both monitor have a different APERTURE GRILL PITCH, which is 
not the same as a dot pitch.  I'll spare you the details....


							-Paul

    Thanks,
    I'm not an expert on this, What does APERTURE GRILL PITCH mean?
    Will it work on a 255 with the powerstorm 4d20 and Open VMS?
    Regards
    Martin

It will work. Aperture Grill Pitch is the distance between the little tiny
red dots you see on a white screen when you look closely with a magnifying
glass. More dots is better, i.e. smaller Aperture Grill Pitch is better.

--RS

Trinitron/Diamondtron (apertrue grille pitch) CRT are most notable for 
one or two damper wire on the aperture grille, which cause one or two faint 
horizontal grey shaddow lines on the display.  This can be annoying to some 
people.

Invar shaddow mask (dot pitch) monitor are said to be better at text, while 
some say Trinitron/Diamontron have better color.

.25mm aperture grille pitch have approximately the same sharpness as a 
.28mm dot pitch Invar shaddow mask.

...but that's probably more than you ever wanted to know about monitors!


							-Paul
  

    Martin, Steve, Paul, and for those who are interested in video and
    monitor info.  I will expound a little----But first, from a user's
    perspecitve and from a video perspective the small dot/aperture pitch
    difference, on either of these monitors cannot be seen with the eye;
    I challenge you!!  It can be measured however.
    
    Real briefly, with CRT's there are two major successful technology types
    of common monitors.  
    	o The first, historically, is the tripple electron gun which uses
          a shadow mask (many thousands of holes in thin metal in the right
          places) and the inside of the crt surface is covered with three
          color rare phospher "dots"; RCA brought this from an idea to 
          profit in the standard TV.  Of course the Computer needed better
          video quality so this technology was brougt to the level of
          one of Digital's last products ; the VR320 and equivelents.
          this technology had two problems--low intenstiy, and image
          distortion with high emmisison.  The two culperets were the
          shadow mask, and the dot system gemotry.
    
    	o The second successful technology was designed and very profitably
          sold as the Trinitron crt (tube).  By the way, Sony has sold
          this design and technology to many other current vendors, such
          as Mitsubishi, who sell their slightly modified gun/tube as a
          "Diamondtron" tube.
    	  Back to the Trinitron, triad differences.
          A Trinitron uses a single electron gun, an apertrue grille (fine
          vertical wires with two damper wires, as mentioned) and a
          stripped rare earth phosperesent crt screen (inside of the crt
          envelope).  
          The primary differences and advantages of this configuration is
          this:--there is only two minor negitaves to the system--I will
          explain later.
    	  The apertrue grille allows about 30 persent more electrons to 
          strike the screen phosper--In my opinion the SONY phospers are
          superior to other vendor phospers.  The second advantage
          to this configuration is when there is a bright (lots of electon
          flow) picture, the aperture grille wires do not distort as the
          shadow mask does--shadow mask distortion is called "doming".
          Doming causes video distortion.  The aperture grille wires are
          under significant tension, all that happens to them is the begin
          to stretch, but there is no geometry change to the image.
    	  I am going to stop here, but I did want to mention the two minor
          problems with Trinitron technology.  The first mentioned is the
          two slightly noticable dark lines (1/4 the way up, and down) on
          the screen.  These are the oscillation damping wires.  Along with
          this if the monitor is  tapped on the side--horizontaly or is
          in an area with mechanical vibrations, these wires can and will
          move, giving as "soft" or defocused video image.
          Sometimes things like this is just nice to know!  Thanks for
          listening!
    							Art Brooks
    be seen with the eye.