Atari 1400XL

Atari 1400XL
Specifications
Manufacturer	Atari, Inc.
Type	Home Computer (prototype)
Released	Never released (announced January 1983 CES)
Discontinued	Cancelled (1983)
Intro price	N/A (prototype only)
CPU	MOS Technology 6502C @ 1.79 MHz
Memory	64 KB RAM, 16 KB ROM
Storage	External cassette tape, external 5.25" floppy disk drive (via SIO)
Display	320×192 pixels maximum, 16 colours with 16 intensity levels (ANTIC/GTIA)
Sound	POKEY: 4 voices; Votrax SC-01 speech synthesizer (built-in)
Dimensions	Similar to Atari 1200XL case
Weight	Unknown
OS / Firmware	Atari XL OS, Atari BASIC Revision B
Predecessor	Atari 1200XL
Successor	Atari 800XL (production replacement)
Model no.	1400XL

The Atari 1400XL was a prototype home computer developed by Atari, Inc. as part of the XL series. Announced at the Winter Consumer Electronics Show (CES) in January 1983, it was intended as an enhanced version of the Atari 1200XL with a built-in 300-baud modem and Votrax SC-01 speech synthesizer. The 1400XL was never commercially released.

Background

The Atari 1200XL, released in late 1982, had been criticised for removing several features present in the earlier Atari 800, including the Parallel Bus Interface (PBI) and the second cartridge slot, while also introducing software compatibility issues. Atari sought to address these shortcomings with a revised line of XL computers, including the 1400XL, the more ambitious 1450XLD, and the production models that would eventually become the Atari 600XL and Atari 800XL.

The 1400XL was conceived as a premium model that would reintroduce the PBI while adding telecommunications and speech capabilities directly into the machine.

Specifications

The 1400XL shared the core architecture of the Atari 8-bit family:

Processor: MOS Technology 6502C at 1.79 MHz
RAM: 64 KB
ROM: 16 KB (Atari BASIC Revision B on cartridge)
Co-processors: ANTIC (video/display lists), GTIA (colour/sprites), POKEY (sound/I/O), FREDDIE (memory manager)
Modem: Built-in 300-baud modem (Bell 103 compatible) with ModemLink software
Speech: Votrax SC-01 speech synthesizer chip
I/O: SIO serial bus, Parallel Bus Interface (PBI), 2 joystick ports, cartridge port, composite video
Keyboard: Full-stroke keyboard with function keys (Reset, Option, Select, Start, Help, F1–F4)
Case: Externally nearly identical to the Atari 1200XL

Built-in Modem

The 1400XL's integrated 300-baud modem was Bell 103 compatible, allowing direct telecommunications without an external peripheral. The bundled ModemLink software provided basic terminal emulation capabilities. At a time when modems were expensive standalone peripherals, a built-in modem would have been a significant selling point for home users interested in bulletin board systems (BBS) and early online services.

Speech Synthesizer

The Votrax SC-01 speech synthesis chip allowed the 1400XL to produce intelligible speech output under software control. The SC-01 used phoneme-based synthesis, where software would send a sequence of phoneme codes to the chip, which would then generate corresponding speech sounds. While the quality was characteristically robotic by modern standards, it represented an advanced feature for a home computer in 1983.

Cancellation

The 1400XL was never released to the public. Internal development difficulties, the commercial failure of the 1200XL, and the broader turmoil within Atari, Inc. — which would be sold to Jack Tramiel in July 1984 — led to the cancellation of the 1400XL project. Atari instead focused on the simpler and more cost-effective 600XL and 800XL models, which were successfully brought to market in late 1983.

Surviving Units

Two variants of the 1400XL prototype are known to exist: one with its own dedicated 1400XL motherboard, and another that appears to use a 1450XLD motherboard without the floppy drive controller board. Surviving units are extremely rare and are highly sought after by collectors.

References

Atari 8-bit computers — Wikipedia
The Atari 1400XL Computer Systems — Atari Museum
Atari 1400XL — Gury's Atari 8-bit Forever Portal