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doc/disk-mx.md

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-mx
-====
-## Soviet-era PDP-11 clone
-<!-- This file is automatically generated. Do not edit. -->
-
-The DVK (in Russian, 沾7d65
-Computing Complex) was a late 1970s Soviet personal computer, a cut-down
-version of the professional SM EVM (ⵁ241c
---- literally System of Mini Computers), which _itself_ was an unlicensed
-clone of the PDP-11. The MX board was an early floppy drive controller board
-for it.
-
-<div style="text-align: center">
-<a href="http://www.leningrad.su/museum/show_big.php?n=1006"><img src="dvk3m.jpg" style="max-width: 60%" alt="A DVK computer"></a>
-</div>
-
-The MX format is interesting in that it has to be read a track at a time. The
-format contains the usual ID prologue at the beginning of the track, then
-eleven data blocks and checksums, then the epilogue, then it stops. The
-actual encoding is normal FM. There were four different disk variants, in all
-combinations of single- and double-sided and 40- and 80-tracked; but every
-track contained eleven 256-byte sectors.
-
-The format varies subtly depending on whether you're using the 'new' driver
-or the 'old' driver. FluxEngine should read both.
-
-A track is:
-
-  * 8 x 0x0000 words (FM encoded as 01010101...)
-  * 1 x 0x00F3 --- start of track
-  * 1 x 0xnnnn --- track number
-  * 11 of:
-    * 128 words (256 bytes) of data
-    * 16 bit checksum
-  * **if 'new' format:**
-    * 3 x 0x83nn --- `n = (track_number<<1) + side_number`
-  * **if 'old' format:**
-    * 3 x 0x8301
-
-The checksum is just the unsigned integer sum of all the words in the sector.
-Words are all stored little-endian.
-
-## Options
-
-  - Format variants:
-      - `110`: 110kB 5.25" 40-track SSSD
-      - `220ds`: 220kB 5.25" 40-track DSSD
-      - `220ss`: 220kB 5.25" 80-track SSSD
-      - `440`: 440kB 5.25" 80-track DSSD
-
-## Examples
-
-To read:
-
-  - `fluxengine read mx --110 -s drive:0 -o mx.img`
-  - `fluxengine read mx --220ds -s drive:0 -o mx.img`
-  - `fluxengine read mx --220ss -s drive:0 -o mx.img`
-  - `fluxengine read mx --440 -s drive:0 -o mx.img`
-
-## References
-
-  - [The Soviet Digital Electronics
-    Museum](http://www.leningrad.su/museum/main.php) (source of the image
-    above)
-
-  - [a random post on the HxC2001 support
-    forum](http://torlus.com/floppy/forum/viewtopic.php?t=1384) with lots of
-    information on the format
-
+-d
+\r