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<H2><A NAME="SECTION00451000000000000000"> </A>
<A NAME="hardware"> </A>
<BR>
Hardware
</H2>
<UL>
<LI>Computer system: any system which can run either VAX/VMS or UNIX
operating systems. MIDAS implementations have been made on a large
number of systems from vendors e.g. VAX stations, DEC stations,
SUN SPARCstations, HP 700 series, IBM RS/6000 systems, PCs.
The availability for a specific system can be checked by
asking the MIDAS Support.
<LI>Memory: depending on the number of users of the systems but
normally at least 8 Mbyte. A physical memory that is too small may
significantly reduce the performance due to swapping of data to disk.
<LI>Disk: the full MIDAS system requires of the order of 100 Mbyte of
disk storage
depending on the type of CPU. During installation an extra 10 Mbyte
should be available for temporary files such as object code.
The size of the system can be reduced in three ways: a) source
files can be deleted after implementation, b) help-files can be
removed if on-line help is not required, and c) parts of the
system which are not used (<I>e.g.</I> crowded field photometry or
echelle packages) need not be loaded. Implementations using shared
libraries are available on some systems (<I>e.g.</I> SPARCstations and
PCs). This reduces the needed disk space significantly.
<P>
A typical disk size for a single user system is approximately 200
Mbyte assuming 60 Mbyte for the operation system, 80 Mbyte for MIDAS,
and 50-100 Mbyte for a user with 2-dimensional data.
<LI>Terminals: any alpha-numeric terminal can be used. MIDAS can either
work in a simple line-by-line mode or provide special features such
as line editing by using a terminal definition file for special
terminal features.
<LI>Graphic display: the graphics software of MIDAS uses the device
independent plotting library AGL <A NAME="tex2html4"
HREF="footnode.html#foot418"><SUP>1.4</SUP></A> made by the italian ASTRONET. Drivers
for a significant number of different devices are available <I>e.g.</I>
X Window System, PostScript, aand various types of graphics
terminals
(see a complete list in Chapter <A HREF="node83.html#graphic-and-image-display">6</A>).
It is possible to write drivers for devices for which none exist
(see the AGL driver manual).
<LI>Image displays: MIDAS uses the <B>I</B>mage <B>D</B>isplay
<B>I</B>nterfaces which provides a general interface to image display
devices. The X Window System running under different window
managers is fully supported. Other devices can be used if an
appropriate set of IDI-routines are written. A list of currently
available IDI-routines can be obtained from the MIDAS Support Group.
</UL>
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<ADDRESS>
<I>Petra Nass</I>
<BR><I>1999-06-09</I>
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