CPU: MOS Technology 6502C (1.79MHz for NTSC / 1.77MHz for PAL) MEMORY: 16Kb, 64Kb to 128Kb RAM (600XL, 65XE/1200XL/800XL, 130XE respectively), 16-32Kb ROM GRAPHICS: Upto 16 colors on screen at 160x192 or 2 colors at 384x240 (overscan) from an 128 to 256 color palette (the last available only on GTIA chip found in later than the old 400/800 models). SOUND: (POKEY custom chip) sound generator of 4 voices, 3.5 octaves, capable for polyphonic music and sound effects. MEDIA/STORAGE: cartridge slot, external tape-recorder, external fdd 360kb
Introduced in 1979 (Atari 400 and 800 models) and manufactured until 1992 (the XL and XE series), the Atari 8bit home computers are all are based on the MOS Technology 6502 CPU running at 1.79 MHz. These home-micro computers were designed with enclosed modules for memory, ROM cartridges, and keyed connectors. The system did not required the user to enter commands to boot the system, while the OS would boot automatically loading drivers from devices on the serial bus (SIO). In 1983 the 600XL was the replacement for the 400, while the 800XL would replace both the 800 and 1200XL. Both machines looked similar to the 1200XL, but were smaller back to front, the 600 being somewhat smaller than the 800 front-to-back. In 1985 (the period when Jack Tramiel was the head of Atari) the mighty 65XE and 130XE models introduced adding a few nice features such as more graphics modes. By the way, the XE stands for XL-Expanded! Note that both models introduced as the initial models for the...Atari ST series, and visually resembled the Atari ST casing. The graphics capabilities provided horizontal and vertical coarse scrolling requiring minimal CPU direction. Furthermore, the ANTIC hardware supports horizontal and vertical fine scrolling—shifting the display of screen data incrementally by single pixels horizontally and single scan lines vertically.
The Atari XL/XE (default) color palette
256-color palette with 16 on-screen (for GTIA chip based models)