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