Monitor Types

The following are the various resolutions used in video game monitors. The information below was included in an article by Randy Fromm which was published in the August 1994 issue of RePlay Magazine on page 82.

Atari Games Video Standards

Standard Resolution

          HORIZONTAL                    VERTICAL
Scan Frequency: 15.72 KHz    Scan Frequency: 60.0 Hz
   Scan Period: 63.6 µSec       Scan Period: 16.7 mSec
  Active Video: 46.9 µSec      Active Video: 15.3 mSec
   Video Delay: 11.9 µSec       Video Delay:  1.2 mSec
    Sync Pulse:  4.7 µSec        Sync Pulse:  0.2 mSec
     Scan Line: 456 Pixels           Screen: 262 Lines
    Resolution: 336 Pixels       Resolution: 240 Lines
    Clock Freq: 7.16 MHz

Extended Resolution

          HORIZONTAL                    VERTICAL
Scan Frequency: 16.50 KHz    Scan Frequency: 53.0 Hz
   Scan Period: 60.6 µSec       Scan Period: 18.9 mSec
  Active Video: 48.0 µSec      Active Video: 17.4 mSec
   Video Delay: 11.9 µSec       Video Delay:  1.2 mSec
    Sync Pulse:  3.9 µSec        Sync Pulse:  0.2 mSec
     Scan Line: 646 Pixels           Screen: 312 Lines
    Resolution: 512 Pixels       Resolution: 288 Lines
    Clock Freq: 10.67 MHz

Medium Resolution

          HORIZONTAL                    VERTICAL
Scan Frequency: 25.00 KHz    Scan Frequency: 60.0 Hz
   Scan Period: 40.0 µSec       Scan Period: 16.7 mSec
  Active Video: 32.0 µSec      Active Video: 15.4 mSec
   Video Delay:  7.2 µSec       Video Delay:  1.2 mSec
    Sync Pulse:  4.0 µSec        Sync Pulse:  0.2 mSec
     Scan Line: 640 Pixels           Screen: 416 Lines
    Resolution: 512 Pixels       Resolution: 384 Lines
    Clock Freq: 16.00 MHz

VGA20 Resolution

          HORIZONTAL                    VERTICAL
Scan Frequency: 31.55 KHz    Scan Frequency: 70.0 Hz
   Scan Period: 31.7 µSec       Scan Period: 14.3 mSec
  Active Video: 25.6 µSec      Active Video: 12.2 mSec
   Video Delay:  5.7 µSec       Video Delay:  1.1 mSec
    Sync Pulse:  4.0 µSec        Sync Pulse:  0.2 mSec
     Scan Line: 634 Pixels           Screen: 450 Lines
    Resolution: 512 Pixels       Resolution: 384 Lines
    Clock Freq: 20.00 MHz