Atari 800XL: Difference between revisions
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The '''Atari 800XL''' is a home computer released by Atari, Inc. in 1983 as part of the Atari 8-bit family. It combined the improved electronics of the XL line with a revised, compact case and a full 64 KB of RAM, becoming one of the most popular Atari 8-bit models worldwide. | The '''Atari 800XL''' is a home computer released by Atari, Inc. in 1983 as part of the Atari 8-bit family. It combined the improved electronics of the XL line with a revised, compact case and a full 64 KB of RAM, becoming one of the most popular Atari 8-bit models worldwide. | ||
== | == Architecture and Processor == | ||
The 800XL is powered by the '''MOS Technology 6502C''' microprocessor, running at: | The 800XL is powered by the '''MOS Technology 6502C''' microprocessor, running at: | ||
* '''1.79 MHz''' (NTSC systems) | * '''1.79 MHz''' (NTSC systems) | ||
| Line 37: | Line 37: | ||
This architecture enabled advanced graphics and sound for its era, with hardware support for smooth scrolling, sprites (player/missile graphics), and multiple display modes. | This architecture enabled advanced graphics and sound for its era, with hardware support for smooth scrolling, sprites (player/missile graphics), and multiple display modes. | ||
== | == Memory and Storage == | ||
The Atari 800XL features: | The Atari 800XL features: | ||
* '''64 KB RAM''' – the maximum addressable by the 6502, allowing for more complex software and full compatibility with most Atari 8-bit programs. | * '''64 KB RAM''' – the maximum addressable by the 6502, allowing for more complex software and full compatibility with most Atari 8-bit programs. | ||
| Line 47: | Line 47: | ||
* '''Cartridge slot''' – for instant-loading software and utilities. | * '''Cartridge slot''' – for instant-loading software and utilities. | ||
== | == Display and Graphics == | ||
Graphics are handled by the ANTIC and GTIA chips, offering: | Graphics are handled by the ANTIC and GTIA chips, offering: | ||
* '''Resolution:''' up to 320×192 pixels (bitmap mode) | * '''Resolution:''' up to 320×192 pixels (bitmap mode) | ||
| Line 57: | Line 57: | ||
These capabilities made the 800XL a favourite for games and graphics-intensive applications. | These capabilities made the 800XL a favourite for games and graphics-intensive applications. | ||
== | == Sound Capabilities == | ||
Audio is generated by the '''POKEY''' chip, providing: | Audio is generated by the '''POKEY''' chip, providing: | ||
* '''4 independent voices''' (channels), each with 8-bit resolution | * '''4 independent voices''' (channels), each with 8-bit resolution | ||
| Line 66: | Line 66: | ||
The POKEY chip's flexibility allowed for a wide range of sound effects and music, contributing to the system's strong gaming library. | The POKEY chip's flexibility allowed for a wide range of sound effects and music, contributing to the system's strong gaming library. | ||
== | == Input/Output and Expansion == | ||
The 800XL offers a comprehensive set of I/O ports: | The 800XL offers a comprehensive set of I/O ports: | ||
* '''Cartridge slot''' – for game and utility cartridges | * '''Cartridge slot''' – for game and utility cartridges | ||
| Line 78: | Line 78: | ||
The PBI allowed for advanced expansions, such as memory upgrades and hard disk interfaces, although few peripherals were released for it. | The PBI allowed for advanced expansions, such as memory upgrades and hard disk interfaces, although few peripherals were released for it. | ||
== | == PCB Schematics & Service Manual == | ||
<templatestyles src="Template:StyledTable/styles.css" /> | <templatestyles src="Template:StyledTable/styles.css" /> | ||
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|- | |- | ||
| [[File:Atari 800XL board top perspective fix (72RHA AT8489594 I-474) - retouched.jpg|center|thumb|350x350px|Atari 800XL Logic Board]] | | [[File:Atari 800XL board top perspective fix (72RHA AT8489594 I-474) - retouched.jpg|center|thumb|350x350px|Atari 800XL Logic Board]] | ||
| [[File: | | [[File:Atari 800XL Schematics.pdf|center|thumb|800XL Logic Board Schematic]] | ||
|} | |} | ||
* The full Atari 800XL Field Service Manual, including schematics and troubleshooting flowcharts, is available at: [[Atari 800XL Field Service Manual]] | * The full Atari 800XL Field Service Manual, including schematics and troubleshooting flowcharts, is available at: [[Atari 800XL Service Manual|Atari 800XL Field Service Manual]] | ||
== | == Gallery == | ||
<gallery mode="packed" heights="200"> | <gallery mode="packed" heights="200"> | ||
File:Atari-800XL.jpg|Atari 800XL front view | File:Atari-800XL.jpg|Atari 800XL front view | ||
| Line 101: | Line 101: | ||
</gallery> | </gallery> | ||
== | == Related Pages == | ||
* [[Atari 800XL General Maintenance]] | * [[Atari 800XL General Maintenance]] | ||
* [[Atari 800XL Troubleshooting Guide]] | * [[Atari 800XL Troubleshooting Guide]] | ||
Latest revision as of 17:42, 9 August 2025
 | |
| Atari 800XL home computer | |
| Specifications | |
|---|---|
| Manufacturer | Atari, Inc. |
| Type | Home Computer |
| Released | 1983 |
| Discontinued | 1985 |
| Intro price | US$299 (1983) |
| CPU | MOS Technology 6502C @ 1.79 MHz (NTSC) / 1.77 MHz (PAL) |
| Memory | 64 KB RAM, 16 KB ROM |
| Storage | External cassette tape, optional 5.25" floppy disk drive (Atari 1050) |
| Display | 320×192 pixels (max), 40×24 text, 16 colours (ANTIC/GTIA) |
| Sound | POKEY: 4 voices, 8-bit mono |
| Dimensions | 40.6 cm × 24.1 cm × 7.6 cm |
| Weight | 2.1 kg |
| OS / Firmware | Atari BASIC (in ROM), Atari OS-B |
| Predecessor | Atari 800 |
| Successor | Atari 65XE |
| Codename | Sweet-16 |
| Model no. | 800XL |
The Atari 800XL is a home computer released by Atari, Inc. in 1983 as part of the Atari 8-bit family. It combined the improved electronics of the XL line with a revised, compact case and a full 64 KB of RAM, becoming one of the most popular Atari 8-bit models worldwide.
Architecture and Processor
[edit | edit source]The 800XL is powered by the MOS Technology 6502C microprocessor, running at:
- 1.79 MHz (NTSC systems)
- 1.77 MHz (PAL systems)
The CPU is supported by custom Atari chips:
- ANTIC – programmable video interface, generating display lists and handling graphics modes.
- GTIA – manages colour, player/missile graphics, and collision detection.
- POKEY – provides sound, keyboard scanning, serial I/O, and random number generation.
- PIA – handles parallel I/O for peripheral connections.
This architecture enabled advanced graphics and sound for its era, with hardware support for smooth scrolling, sprites (player/missile graphics), and multiple display modes.
Memory and Storage
[edit | edit source]The Atari 800XL features:
- 64 KB RAM – the maximum addressable by the 6502, allowing for more complex software and full compatibility with most Atari 8-bit programs.
- 16 KB ROM – containing the OS-B operating system and Atari BASIC (in most regions).
Storage options include:
- Atari 1010 Program Recorder – cassette tape drive for data storage and loading.
- Atari 1050 Floppy Disk Drive – external 5.25" disk drive for faster, more reliable storage.
- Cartridge slot – for instant-loading software and utilities.
Display and Graphics
[edit | edit source]Graphics are handled by the ANTIC and GTIA chips, offering:
- Resolution: up to 320×192 pixels (bitmap mode)
- Text: 40 columns × 24 rows (default), with hardware support for 20, 40, or 80 columns (via software)
- Colours: up to 16 on screen simultaneously, with a palette of 256 hues and 16 luminance levels
- Player/Missile Graphics: 4 players (sprites) and 4 missiles, with collision detection and priority control
- Smooth scrolling and fine control over display lists, enabling split-screen and mixed-mode graphics
These capabilities made the 800XL a favourite for games and graphics-intensive applications.
Sound Capabilities
[edit | edit source]Audio is generated by the POKEY chip, providing:
- 4 independent voices (channels), each with 8-bit resolution
- Programmable frequency, volume, and distortion
- White noise generation for percussion and effects
- Keyboard scanning, serial I/O, and random number generation
The POKEY chip's flexibility allowed for a wide range of sound effects and music, contributing to the system's strong gaming library.
Input/Output and Expansion
[edit | edit source]The 800XL offers a comprehensive set of I/O ports:
- Cartridge slot – for game and utility cartridges
- SIO (Serial Input/Output) port – daisy-chained connection for disk drives, printers, modems, and other peripherals
- Parallel Bus Interface (PBI) – a 50-pin edge connector for direct memory-mapped expansion (unique to XL models)
- 2 joystick ports – compatible with Atari-standard controllers
- Composite and RF video outputs – for connection to TVs and monitors
- Audio output – mono sound via TV or monitor
- Power input – external power supply
The PBI allowed for advanced expansions, such as memory upgrades and hard disk interfaces, although few peripherals were released for it.
PCB Schematics & Service Manual
[edit | edit source]| Logic Board | Schematic Diagrams |
|---|---|
_-_retouched.jpg) |
File:Atari 800XL Schematics.pdf |
- The full Atari 800XL Field Service Manual, including schematics and troubleshooting flowcharts, is available at: Atari 800XL Field Service Manual
Gallery
[edit | edit source]-
Atari 800XL front view -
Rear panel with ports -
800XL motherboard -
Atari 1050 disk drive -
Atari 1010 Program Recorder
