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doc/disk-aeslanier.md

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