02-20-2020
Very cool.
I did a lot of mucking around with Simulated Annealing and the Metropolis algorithm while in uni. Using it for tasks like fitting various sized files onto minimum numbers of floppy disks, finding optimum solutions for student + classroom + teacher timetables for schools etc.
But given the money to be made in the financial realm, I can't see these algorithms making it to the public domain any time soon.
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ARFF(8) System Manager's Manual ARFF(8)
NAME
arff, flcopy - archiver and copier for floppy
SYNOPSIS
/usr/sbin/arff [ key ] [ name ... ]
/usr/sbin/flcopy [ -h ] [ -tn ]
DESCRIPTION
Arff saves and restores files on VAX console media (the console floppy on the VAX 11/780 and 785, the cassette on the 11/730, and the con-
sole RL02 on the 8600/8650). Its actions are controlled by the key argument. The key is a string of characters containing at most one
function letter and possibly one or more function modifiers. Other arguments to the command are file names specifying which files are to
be dumped or restored. The default options are correct for the RX01 floppy on the 780; for other console media, the f and m flags are
required.
Files names have restrictions, because of radix50 considerations. They must be in the form 1-6 alphanumerics followed by "." followed by
0-3 alphanumerics. Case distinctions are lost. Only the trailing component of a pathname is used.
The function portion of the key is specified by one of the following letters:
r The named files are replaced where found on the floppy, or added taking up the minimal possible portion of the first empty spot on
the floppy.
x The named files are extracted from the floppy.
d The named files are deleted from the floppy. Arff will combine contiguous deleted files into one empty entry in the rt-11 direc-
tory.
t The names of the specified files are listed each time they occur on the floppy. If no file argument is given, all of the names on
the floppy are listed.
The following characters may be used in addition to the letter which selects the function desired.
v The v (verbose) option, when used with the t function gives more information about the floppy entries than just the name.
f causes arff to use the next argument as the name of the archive instead of /dev/floppy.
m causes arff not to use the mapping algorithm employed in interleaving sectors around a floppy disk. In conjunction with the f
option it may be used for extracting files from rt11 formatted cartridge disks, for example. It may also be used to speed up
reading from and writing to rx02 floppy disks, by using the `c' device instead of the `b' device. It must be used with TU58 or
RL02 media.
c causes arff to create a new directory on the floppy, effectively deleting all previously existing files.
Flcopy copies the console floppy disk (opened as `/dev/floppy') to a file created in the current directory, named "floppy", then prints the
message "Change Floppy, hit return when done". Then flcopy copies the local file back out to the floppy disk.
The -h option to flcopy causes it to open a file named "floppy" in the current directory and copy it to /dev/floppy; the -t option causes
only the first n tracks to participate in a copy.
FILES
/dev/floppy or /dev/rrx??
floppy (in current directory)
SEE ALSO
crl(4), fl(4), rx(4), tu(4), rxformat(8)
AUTHORS
Keith Sklower, Richard Tuck
BUGS
Device errors are handled ungracefully.
4th Berkeley Distribution November 16, 1996 ARFF(8)