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fluxengine/doc/disk-atarist.md
2025-08-20 21:23:02 +02:00

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atarist
====
## Almost PC compatible
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Atari ST disks are standard MFM encoded IBM scheme disks without an IAM header.
Disks are typically formatted 512 bytes per sector with between 9-10 (sometimes
11!) sectors per track and 80-82 tracks per side.
For some reason, occasionally formatting software will put an extra IDAM record
with a sector number of 66 on a disk, which can horribly confuse things. The
Atari profiles below are configured to ignore these.
Be aware that many PC drives (including mine) won't do the 82 track formats.
## Options
- Format variants:
- `360`: 360kB 3.5" 80-track 9-sector SSDD
- `370`: 370kB 3.5" 82-track 9-sector SSDD
- `400`: 400kB 3.5" 80-track 10-sector SSDD
- `410`: 410kB 3.5" 82-track 10-sector SSDD
- `720`: 720kB 3.5" 80-track 9-sector DSDD
- `740`: 740kB 3.5" 82-track 9-sector DSDD
- `800`: 800kB 3.5" 80-track 10-sector DSDD
- `820`: 820kB 3.5" 82-track 10-sector DSDD
## Examples
To read:
- `fluxengine read -c atarist --360 -s drive:0 -o atarist.img`
- `fluxengine read -c atarist --370 -s drive:0 -o atarist.img`
- `fluxengine read -c atarist --400 -s drive:0 -o atarist.img`
- `fluxengine read -c atarist --410 -s drive:0 -o atarist.img`
- `fluxengine read -c atarist --720 -s drive:0 -o atarist.img`
- `fluxengine read -c atarist --740 -s drive:0 -o atarist.img`
- `fluxengine read -c atarist --800 -s drive:0 -o atarist.img`
- `fluxengine read -c atarist --820 -s drive:0 -o atarist.img`
To write:
- `fluxengine write -c atarist --360 -d drive:0 -i atarist.img`
- `fluxengine write -c atarist --370 -d drive:0 -i atarist.img`
- `fluxengine write -c atarist --400 -d drive:0 -i atarist.img`
- `fluxengine write -c atarist --410 -d drive:0 -i atarist.img`
- `fluxengine write -c atarist --720 -d drive:0 -i atarist.img`
- `fluxengine write -c atarist --740 -d drive:0 -i atarist.img`
- `fluxengine write -c atarist --800 -d drive:0 -i atarist.img`
- `fluxengine write -c atarist --820 -d drive:0 -i atarist.img`
## References
- [Atari ST Floppy Drive Hardware
Information](https://info-coach.fr/atari/hardware/FD-Hard.php) by Jean
Louis-Guerin
- [Atari ST Floppy Drive Software
Information](https://info-coach.fr/atari/software/FD-Soft.php) by Jean
Louis-Guerin