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    Atari 800XL
    a800xl.jpg
    Photo courtesy of Hans-Martin Krober of The Atari Exhibition

    Model Atari 800XL
    Processor MOS Technology 6502C 1.79MHz (NTSC)
    1.77MHz (PAL)
    Custom LSI Chips ANTIC Microprocessor dedicated to the television display. It retieves the diplay list and display data from RAM using direct memory access (DMA). It processes the higher level instructions in the display list and translates these instructions into a real-time stream of simple instructions to GTIA.
    GTIA (CTIA in very early models) A television interface chip. Converts the digital commands from ANTIC (or the 6502 directly) into the signal that goes to the television. GTIA also adds color values, player-missle graphics, and collision detection.
    POKEY Digital I/O chip. Handles the serial I/O bus, audio generation, keyboard scan, and random number generation. Also digitizes the resistive paddle inputs and controls maskable interrupt (IRQ) requests from peripherals.
    PIA (not sure)
    Memory 64K RAM
    24K ROM
    Operating System XL OS (In ROM)
    Interfaces Cartridge Slot 16K address space
    (2) Joystick (serial) Ports 9-pin D-Type
    Atari Serial I/O (SIO)
    Parallel Bus Interface Provides direct memory access
    RF Interface
    Sound 4 channels 3.5 octaves each channel
    Keyboard 62 keys Full stroke (typewriter-style)
    Function Keys Reset, Option, Select, Start, Help
    Built-in Software Self Test
    Basic Rev. B or C
    Announced June 1983
    Released November 1983

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