Editing Atari 1200XL (section)

== Display and Graphics ==
Graphics are handled by the ANTIC and GTIA chips:
* '''Resolution:''' up to 320×192 pixels (bitmap mode)
* '''Text:''' 40 columns × 24 rows (default)
* '''Colours:''' up to 16 on screen, from a palette of 256 hues across 16 luminance levels
* '''Player/Missile Graphics:''' 4 players (sprites) and 4 missiles, with collision detection and priority control
* '''Graphics modes 12–15:''' GTIA-specific modes available via BASIC on the 1200XL
* '''Smooth scrolling''' and fine control over display lists, enabling split-screen and mixed-mode graphics

The 1200XL's video output circuit provides enhanced chroma for a more colourful RF image. However, the chroma line is not connected to the 5-pin DIN monitor jack, limiting monitor output to composite video and luminance only. The monitor connector pinout is:
{| class="wikitable" style="width:40%; text-align:center;"
|-
! Pin !! Signal
|-
| 1 || Composite luminance
|-
| 2 || Ground
|-
| 3 || Audio output
|-
| 4 || Composite video
|-
| 5 || Ground
|}