Max Resolution---: 640 Horizontal dots x 
                   200 Vertical dots/lines 
Dot Pitch--------: .37mm 
CRT Size---------: 12"/  11.5" viewable 
Video Bandwidth--: 6.5MHz   (+/- 1.5DB) 
  

Scanning Frequencies 

               60Hz model     50Hz model 
Horizontal:    15.734kHz      15.696kHz 
Vertical:         60Hz           50Hz 
  

 Pin    Function 

  1     Red video ground 
  2     Red composite video 
  3     Composite sync 
  4    (not used) 
  5     Green composite video 
  6     Green video ground 
  7    (not used) 
  8    (not used) 
  9     Blue composite video 
 10    (not used) 
 11    (not used) 
 12    (not used) 
 13     Blue video ground 
 14    (not used) 
 15    (not used) 
Shell   Shield ground 
  

---------------------------- 
  

From: Mitchell Spector 

    The above specs show only maximum resolution when used 
with a plain Apple IIgs. It has an interlaced mode which 
allows you to display 640x400, though it isn't going to be 
easy to look at for long periods of time. You can see the 
interlaced mode if you have a VOC or Second Sight card. 

    The viewable area on an Apple IIgs is probably a fair bit 
less than 12"/ 11.5" viewable when you take into account all 
the space reserved by the border in all display modes. That 
probably makes it about 10" viewable or so. If you hook up 
another video source (e.g. a SuperNintendo) then you can use 
the entire 11.5", including what would be the border area.