What are the limitations of arcade monitors?
With a 15Khz monitor, there is an important limit. This is vertical resolution. Assuming a vertical sync range of 50-60 Hz, a 15Khz monitor can only display approx 250-300 lines. (this figure is arrived-at by dividing Hfreq by Vfreq, and allowing about 10 “wasted” lines for vertical flyback time) This is perfect for most older games. Any game which originally used a 15Khz monitor can of course be displayed at it’s native resolution providing the VGA card can be configured to do so. Some later games use high-res monitors and have vertical resolutions of 480 or higher. For these, we can enable interlacing and still display at the native resolution. An interlaced picture scans even and odd lines separately, so we can have 480-600 lines interlaced. For the same reason, to display a Windows desktop at 640 X 480 we need to interlace. Unfortunately this does not give a good result on a Windows desktop because interlacing causes horizontal lines which are 1 pixel wide (which may Windows screen
