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The ZX81 had a base configuration of 1 KB of on-board memory that could officially be expanded externally to 64 KB.
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sextractor(1) [debian man page]

SEXTRACTOR(1)							   User Commands						     SEXTRACTOR(1)

NAME
sextractor - extract a source catalog from an astronomical FITS image SYNOPSIS
sextractor image [-c configuration-file] [-parameter1 value1 -parameter2 value2 ...] sextractor image_detect image_measure [-c configuration-file] [-parameter1 value1 -parameter2 value2 ...] sextractor -d DESCRIPTION
SExtractor is a program that builds a catalogue of objects from an astronomical image. Although it is particularly oriented towards reduc- tion of large scale galaxy-survey data, it performs rather well on moderately crowded star fields. On Debian systems, sample SExtractor parameter files are installed to /usr/share/sextractor. Operation modes: -h, --help print this help, then exit -V, --version print version number, then exit -d, --dump dump a default configuration file EXAMPLE
For a minimal sextractor run, without customizing any of the parameters, use sextractor file.fits -c /usr/share/sextractor/default.sex -PARAMETERS_NAME /usr/share AUTHOR
Written by Emmanuel Bertin (Institut d'Astrophysique de Paris and Observatoire de Paris). Copyright 1994-2005 Emmanuel Bertin This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. REPORTING BUGS
Report bugs to <sextractor@iap.fr>. The full documentation for SExtractor is maintained as a Postscript manual available at http://terapix.iap.fr/soft/sextractor ; on Debian systems, it is also installed to /usr/share/doc/sextractor/. SExtractor 2.8.6 January 2013 SEXTRACTOR(1)

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CONFIG.SUB(1)							   User Commands						     CONFIG.SUB(1)

NAME
config.sub - validate and canonicalize a configuration triplet SYNOPSIS
config.sub [OPTION] CPU-MFR-OPSYS DESCRIPTION
../config/config.sub [OPTION] ALIAS Canonicalize a configuration name. Operation modes: -h, --help print this help, then exit -t, --time-stamp print date of last modification, then exit -v, --version print version number, then exit REPORTING BUGS
Report bugs and patches to <config-patches@gnu.org>. COPYRIGHT
Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. SEE ALSO
autoconf(1), automake(1), autoreconf(1), autoupdate(1), autoheader(1), autoscan(1), config.guess(1), config.sub(1), ifnames(1), libtool(1). config.sub (2005-09-19) September 2005 CONFIG.SUB(1)

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