Does anyone have these?  I found some that get me close, but they're
clearly not correct:

# NTSC
Section "Monitor"
   Identifier      "NTSC"
   VendorName      "Unknown"
   ModelName       "Unknown"
   HorizSync       15-16
   VertRefresh     50-60
   Modeline "736x575i" 14.16 736 760 824 904 575 580 585 625 interlace -hsync -v
sync
   Modeline "736x485i" 14.16 736 760 824 904 485 491 496 525 interlace -hsync -v
sync
   Modeline "640x480i" 14.16 640 728 792 904 480 532 537 625 interlace -hsync -v
sync
   Modeline "736x288" 14.16 736 760 824 904 288 290 292 312 -hsync -vsync
EndSection

anyone have anything better?

        -- Jason R. Thorpe <thorpej@nas.nasa.gov>