====== ATARI 8-Bit Systems ======


==== Introduction ====

The Atari released the **Atari 400** and **Atari 800** 8 bit systems in 1979. These were 6502 based systems and included custom chips to provide support for Player/Missile graphics (Sprites), display list based graphics modes, four channels of audio and more. **Star Raiders** was a first-person space combat simulator released in 1980 that showcased a lot of the capabilities of the hardware.

Many revisions and enhanced versions of the systems were released over the years starting with the **1200XL** in 1983 followed by the **600XL** and the **800XL**. In 1985 the **65XE** and **130XE** replaced the **XL** systems. Support for the 8-bit line was officially dropped in 1992.

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==== Applesauce Support ====


=== Disk Types ===

Reading and writing the following **Atari 8-bit** disk types is supported:

^  Atari 8-bit  |
|5.25" SD (Single Sided - 90 KiB)\\ 5.25" ED (Single Sided - 130 KiB)\\ 5.25" DD (Double Sided - 360 KiB)|

=== File Systems ===

File System support for the following **Atari 8-bit** operating systems is available:

^  Atari 8-bit  |
|Atari DOS 2.x  |

Applesauce will be able to verify directories and files in these disks as good or bad. In addition you can export individual files. Exported files can be saved in raw data format or converted to modern text formats.

=== Disk Image Formats ===

The following disk image formats are supported.

^  Atari 8-bit  |
|ATR\\ ATX      |


=== Recommended Drives ===

Atari disks are single sided and either single density or, with the released of the 1050 drive, "enhanced density". Atari later released the **XF551** drive which supported double sided/double density disks. Many users would notch the diskette and use the other side creating what is known as a "flippy" disk. Thus to image Atari disks it is generally recommended you find a third-party Apple II drive which could reach 40 tracks and install an Applesauce sync sensor. Many such drives exist such as the **MicroSci A2** drive.

For double sided **XF551** disks a PC drive can be used.


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==== General Information ====


=== Drive Information ===

5.25"

The most common format, used by the **Atari 810** drive, is a single sided single density 40 track disk with 18 sectors of 128 bytes per track. Single sided double density disks that used 256 bytes per sector were common with third party drives.

When the **Atari 1050** drive was released an "Enhanced Density" was included that was 40 tracks with 26 sectors of 128 bytes per track.

The **Atari XF551** drive added a double sided double density format of 40 tracks of 18 sectors with 256 bytes each using both sides of the disk.

=== Emulators ===

Useful for image verification.

^Windows                                                    ^Mac                                            ^Linux  ^
|[[https://www.virtualdub.org/altirra.html|Altirra]] (Atari 800/XL/XE) |||
|[[https://atari800.github.io/|Atari800]] (Atari 800/XL/XE) |[[https://www.atarimac.com/atari800macx.php|Atari800MacX]] (Atari 800/XL/XE) |[[https://atari800.github.io/|Atari800]] (Atari 800/XL/XE) |