This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
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 Frequencies60Hz model 50Hz model Horizontal: 15.734kHz 15.696kHz Vertical: 60Hz 50HzPin 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---------------------------- By: 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.