KB10012: Atari Models Compared – Consoles, 8-Bit Computers, and ST Line

Atari produced hardware across three largely separate product families: home game consoles, 8-bit personal computers, and the 16/32-bit ST computer line. Each family has its own architecture and software ecosystem. This article covers all the major models across these families.

Home Consoles

Atari 2600 / VCS (1977)

The Atari Video Computer System (later renamed 2600) was one of the most influential game consoles ever produced. It used a MOS 6507 processor (a cost-reduced 6502 variant) at 1.19 MHz with just 128 bytes of RAM. The TIA (Television Interface Adapter) chip handled both video and audio, producing a 160-pixel-wide playfield with a limited color palette (128 colors NTSC, 104 PAL). Games were stored on ROM cartridges, typically 2 KB to 4 KB initially, though bank-switching techniques later allowed much larger cartridges. The 2600 went through several hardware revisions over its long life (1977–1992), including the "heavy sixer" (original six-switch model in a thick case), the "light sixer," the four-switch "Darth Vader" model, and the compact 2600 Jr.

Atari 5200 (1982)

The 5200 SuperSystem was based on the same hardware as the Atari 400/800 computers (see below). It used a 6502C CPU at 1.79 MHz with the ANTIC and GTIA graphics chips, giving it far superior visuals to the 2600. It had 16 KB of RAM and supported up to 32 KB cartridges. The controller featured an analog joystick, numeric keypad, and start/pause/reset buttons. However, the non-centering analog sticks were fragile and widely criticized. The 5200 was not backward-compatible with 2600 cartridges at launch (an adapter was released later) and arrived at the onset of the 1983 video game crash, limiting its commercial success.

Atari 7800 (1986)

The 7800 ProSystem used a custom "SALLY" 6502C CPU at 1.79 MHz with a new MARIA graphics chip capable of displaying up to 100 sprites on screen with a 256-color palette. It was backward-compatible with the entire 2600 cartridge library out of the box. The 7800 had 4 KB of RAM (with an optional POKEY sound chip in some cartridges for improved audio). Originally designed in 1984, it was shelved during Atari's sale to Jack Tramiel and finally released in 1986, by which time the NES had already captured the market. Despite being technically competitive, its late release and limited third-party support kept it in the NES's shadow.

Atari Lynx (1989)

The Lynx was a handheld game console that was technically ahead of its time. It featured a 16-bit custom "Mikey" chip (based on a 65C02 core) at 16 MHz, hardware sprite scaling and rotation, a backlit color LCD screen (160×102 resolution, 4,096-color palette), and the ability to link up to 8 units via the ComLynx cable. The original Lynx (model number PAG-0200) was large and heavy; the Lynx II (PAG-0401, 1991) was a more compact redesign with improved battery life and a clearer screen. Despite its technical superiority over the Game Boy, the Lynx's higher price, larger size, and shorter battery life limited its market success.

Atari Jaguar (1993)

Atari's last console, marketed as the first 64-bit game system. The Jaguar used a complex multi-processor architecture: a "Tom" chip handling graphics (with a GPU and object processor), a "Jerry" chip handling audio (with a DSP), and a Motorola 68000 at 13.3 MHz acting as a general-purpose manager. It had 2 MB of RAM and used ROM cartridges. The Jaguar CD add-on added double-speed CD-ROM capability. The system struggled with a difficult-to-program architecture and a small game library, and was discontinued in 1996.

8-Bit Computers

Atari 400 and 800 (1979)

Atari's first personal computers used a MOS 6502B CPU at 1.79 MHz with three custom chips: ANTIC (display list processor for flexible screen modes), GTIA (graphics and color), and POKEY (sound, keyboard scanning, and serial I/O). This custom-chip architecture gave the 400/800 impressive graphics and sound capabilities for 1979—up to 320×192 resolution with 256 colors (through artifacting) and four-channel sound. The 800 had two cartridge slots, four joystick ports, and 8 KB of RAM expandable to 48 KB via internal slots. The 400 was the budget model with a membrane keyboard and 8 KB of RAM (expandable to 16 KB initially). Both ran Atari BASIC from a cartridge.

Atari 1200XL (1983)

The 1200XL was meant as a premium replacement for the 800. It had 64 KB of RAM, an improved keyboard, built-in diagnostic LEDs, and function keys. However, it had compatibility problems with some 400/800 software and peripherals, removed the second cartridge slot and two of the four joystick ports, and was priced too high. It was quickly replaced.

Atari 600XL and 800XL (1983)

The XL series corrected the 1200XL's missteps. The 800XL shipped with 64 KB of RAM, a built-in BASIC, the Parallel Bus Interface (PBI) for expansion, and excellent software compatibility. It became the best-selling Atari 8-bit computer. The 600XL was the budget model with 16 KB of RAM. Both used the same 6502C/ANTIC/GTIA/POKEY architecture as the originals.

Atari 65XE and 130XE (1985)

The XE series was a cosmetic and minor functional update. The 65XE was functionally identical to the 800XL with 64 KB. The 130XE doubled the RAM to 128 KB through bank switching, which was useful as a RAM disk or for programs that could use the extended memory. The XE styling was smaller and more angular, matching the Atari ST's design language. An XEGS (XE Game System, 1987) was also produced—a 65XE in a console-style case with a detachable keyboard and a built-in game (Missile Command), marketed as both a computer and a game console.

ST / STE / TT / Falcon Computers

Atari 520ST (1985)

The ST ("Sixteen/Thirty-two") was introduced by Jack Tramiel's Atari Corp after he acquired the company from Warner Communications. It used a Motorola 68000 processor at 8 MHz with 512 KB of RAM. The ST ran TOS (The Operating System) with GEM (Graphics Environment Manager) providing a graphical desktop. It could display 320×200 with 16 colors, 640×200 with 4 colors, or 640×400 monochrome—all from a 512-color palette. The built-in MIDI ports made the ST enormously popular with musicians. The ST was the first affordable personal computer with a built-in bitmapped color GUI, beating the Amiga to market by a few months in some regions.

Atari 1040ST (1986)

The 1040ST doubled the RAM to 1 MB and included a built-in double-sided 3.5-inch floppy drive and power supply (the 520ST had used an external supply). It was the first personal computer to ship with 1 MB of RAM at a consumer price point. Software was otherwise identical to the 520ST.

Mega ST (1987)

The Mega ST moved to a professional desktop form factor with a detached keyboard, built-in real-time clock with battery backup, an expansion bus (the MegaBus), and an optional blitter chip for faster block graphics operations. Available in 2 MB and 4 MB configurations. The Mega ST was aimed at desktop publishing and business users.

Atari STe (1989)

The STe ("ST enhanced") added hardware scrolling, a larger color palette (4,096 colors vs. 512), Genlock capability, enhanced DMA sound (8-bit stereo PCM with hardware mixing, up from the original ST's Yamaha YM2149 PSG chip), an analog joystick port, and SIMM RAM slots for easier memory expansion. The hardware improvements were underutilized by software developers since the installed base was mostly standard STs.

Mega STe (1991)

An upgraded Mega ST with the STe's enhanced chipset, a faster 16 MHz 68000 processor (switchable to 8 MHz for compatibility), a VME expansion bus, SIMM memory slots, and an optional 68881 FPU. It bridged the gap between the consumer STe and the professional TT.

Atari TT030 (1990)

A workstation-class machine with a Motorola 68030 at 32 MHz, an optional 68882 FPU, SIMM memory expandable to 26 MB, 6U VME bus slots, SCSI, and improved graphics supporting resolutions up to 1280×960 monochrome or 320×480 with 256 colors. The TT ran an enhanced TOS 3.0 and was positioned for professional CAD, DTP, and scientific work.

Atari Falcon030 (1992)

Atari's final computer and arguably their most technically impressive. The Falcon used a Motorola 68030 at 16 MHz paired with a Motorola 56001 DSP (Digital Signal Processor) at 32 MHz. The DSP enabled real-time audio processing, software-based modem functionality, and multimedia applications. Graphics came from the new VIDEL chip supporting resolutions up to 640×480 in 256 colors or 320×200 in 65,536 "True Color." Audio was 16-bit stereo with 8 DMA channels. RAM ranged from 1 MB to 14 MB. The Falcon also had a local bus for internal expansion. Only produced for about a year before Atari shifted focus entirely to the Jaguar console.

Quick Comparison Table

Model	Year	CPU	RAM	Type
2600	1977	6507 @ 1.19 MHz	128 bytes	Console
400/800	1979	6502B @ 1.79 MHz	8–48 KB	Computer
5200	1982	6502C @ 1.79 MHz	16 KB	Console
800XL	1983	6502C @ 1.79 MHz	64 KB	Computer
130XE	1985	6502C @ 1.79 MHz	128 KB	Computer
520ST	1985	68000 @ 8 MHz	512 KB	Computer
1040ST	1986	68000 @ 8 MHz	1 MB	Computer
7800	1986	6502C @ 1.79 MHz	4 KB	Console
STe	1989	68000 @ 8 MHz	512 KB–4 MB	Computer
Lynx	1989	65C02 @ 16 MHz	64 KB	Handheld
TT030	1990	68030 @ 32 MHz	2–26 MB	Workstation
Falcon030	1992	68030 @ 16 MHz	1–14 MB	Computer
Jaguar	1993	68000 + Tom/Jerry	2 MB	Console

Collector and Restoration Notes

Atari 2600 consoles are generally reliable, though the heavy sixer models can develop power switch contact issues. The 5200 is known for controller failures—the non-centering flex-circuit sticks wear out; aftermarket replacements and rebuilds are available. On 8-bit computers, power supplies should be tested or replaced before use, and the SIO (serial I/O) ports can develop issues from worn connectors. ST-series machines can suffer from floppy drive failures (especially the internal drives), keyboard membrane degradation, and on Mega ST/TT models, battery leakage from the real-time clock. The Falcon030's surface-mount construction makes it more challenging to repair than earlier STs. Atari Lynx units commonly need capacitor replacement, and the original model's screen can dim significantly with age.