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Atari 800XL

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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