CCSD3ZF0000100000001NJPL3IF0PDS200000001 = SFDU_LABEL
RECORD_TYPE                    = STREAM
PRODUCT_CREATION_TIME          = 1991-08-10
OBJECT                         = TEXT
   NOTE                        = "Description of IBM-PC software
                                  provided with the MDIM CD-ROM set"
END_OBJECT                     = TEXT
END

                        PC Display Software

This directory contains software which can be used to display the Mars
Digital Image Map (MDIM) images on a personal computer with EGA, VGA or
Enhanced VGA display.   The program IMDISP.EXE allows the user to
display and manipulate individual files or browse through directories
and subdirectories at will.

The file IMDISP.EXE should be put into a subdirectory which is in your
computer's path table.  This will allow it to be invoked from any
subdirectory on any hard disk or CD-ROM drive. Optionally, IMDISP can
be executed directly from the CDROM.

To display an image on the MDIM CD-ROM type 'FILE', which will prompt
you with a list of file names on the current disk drive. Type 'D' to
select a new drive, then type the letter of your CD-ROM drive ('L' for
example).  The display will show you the various subdirectories on the
MDIM CD-ROM (SCXXXXXX, MI50N220, etc).  Select one of the subdirectories
and a list of file names (ending in '.IMG') will appear.  Select a file
and the image will be loaded then displayed on the screen.  This can
take ten or twenty seconds since the image is loaded into a memory
buffer before being displayed.

You can also use the BROWSE command to view MDIM images. Inside a
subdirectory simply type 'browse' and all the images in that
subdirectory will be displayed.  To display all images on a disk, type
'BROWSE *.IMG ALL', when positioned at the ROOT directory of the CD-ROM.

When viewing the 1/64th degree versions of the images ('MG' 
subdirectories), you can use the cursor command to locate a feature of
interest in an image, then type 'DISPLAY SOURCE' which will display the
same location on the higher resolution 1/256th degree version ('MI'
subdirectory) of the image.

To see more detail in the images, use the 'set' command to set lo and
high values to 96 and 144 respectively (eg. 'set lo 96 hi 144' then
'display'; or 'browse *.img all lo 96 hi 144'.