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Add README and UNLICENSE.

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File README.markdown

+DiskSumo
+========
+
+**DiskSumo** is a Commodore 64 BASIC program to dump an image of the
+floppy disk in unit 8 (assumed to be a 1541 disk drive) over the RS-232
+port via the XMODEM protocol.
+
+The file downloaded on the other end of the connection is usable as-is
+as a `.d64` disk image file.  Note, however, that it won't be able to
+transfer anything sensible from disks which use copy-protection schemes.
+
+This is the program I used to transfer my old C64 diskettes to my PC
+(and in fact, I concocted it for that purpose) at some in the mid-aughts.
+So it can be thanked, for example, for the existence of [Bubble Escape 2K][].
+
+I implemented the XMODEM protocol based on a description of it on a
+printout I had made of a posting on a Winnipeg BBS a decade and a half
+earlier.  I no longer have the printout, but I believe the posting was on
+_Eric the BBS_, and the poster was Bruce Walzer.
+
+Since I transferred all the disks that I could (and since I no longer have
+a physical Commodore 64, and since it is of little use on an emulator) I no
+longer have a need for this program.
+
+If you have a need for this program, then the first hurdle you will have
+to overcome is getting it onto your Commodore 64 in the first place.  You
+will probably need to type it in.
+
+The name "DiskSumo" started life as a typo for "DiskDump".
+
+[Bubble Escape 2K]: http://catseye.tc/projects/bubble-escape/
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org/>