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Fix bad documentation which got checked in somehow.
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@@ -1,2 +1,48 @@
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-d
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\r
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aeslanier
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====
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## 616kB 5.25" 77-track SSDD hard sectored
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<!-- This file is automatically generated. Do not edit. -->
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Back in 1980 Lanier released a series of very early integrated word processor
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appliances, the No Problem. These were actually [rebranded AES Data Superplus
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machines](http://vintagecomputers.site90.net/aes/). They were gigantic,
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weighed 40kg, and one example I've found cost ꆲ5bb4
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of nearly ㇢1a6e
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8080 machines with 32kB of RAM, they ran their own proprietary word
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processing software off twin 5.25" drive units, but apparently other software
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was available.
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The disk format is exceptionally weird. They used 77 track, 32 sector, single-sided
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_hard_ sectored disks, where there were multiple index holes,
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indicating to the hardware where the sectors start. The encoding scheme
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itself is [MMFM (aka
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M2FM)](http://www.retrotechnology.com/herbs_stuff/m2fm.html), an early
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attempt at double-density disk encoding which rapidly got obsoleted by the
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simpler MFM --- and the bytes are stored on disk _backwards_. Even aside from
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the encoding, the format on disk was strange; unified sector header/data
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records, so that the sector header (containing the sector and track number)
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is actually inside the user data.
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FluxEngine can read these, but I only have a single, fairly poor example of a
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disk image, and I've had to make a lot of guesses as to the sector format
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based on what looks right. If anyone knows _anything_ about these disks,
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[please get in touch](https://github.com/davidgiven/fluxengine/issues/new).
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## Options
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(no options)
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## Examples
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To read:
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- `fluxengine read aeslanier -s drive:0 -o aeslanier.img`
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## References
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* [SA800 Diskette Storage Drive - Theory Of
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Operations](http://www.hartetechnologies.com/manuals/Shugart/50664-1_SA800_TheorOp_May78.pdf):
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talks about MMFM a lot, but the Lanier machines didn't use this disk
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format.
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