PGSHOW - The FULL-FEATURED
  Atari Portfolio Graphic Viewer
  by Don Messerli

  PGSHOW V2.1 (06/01/91 - 1788 bytes)
  (c)Copyright 1991 Software Vineyard
  All Rights Reserved

  (How about more 40 column manuals!!)
  (With no tabs this time)

  New Features
  ------------
  I found ways to squeek another 20%
  increase in speed from PGSHOW.
  This was mainly because I'm getting
  better at 8088 assembler.

  See Revision History at end of this
  file to see what changed from 1.1
  to 2.0.

  What is it?
  -----------

  PGSHOW is a program that allows you 
  to view Portfolio Graphic Files on
  the Atari Portfolio.  These files
  are now compressed and have a .PGC
  extension.  If you have old PGF
  files, please compress them with
  PGCOMP.EXE.

  How do I use it?
  ----------------

  SYNTAX:  PGSHOW <filename> [seconds]
   
  Seconds is a value from 0 to 255.
  If you specify 0 secs, PGSHOW will
  display the next file specified
  without a delay.  This is good for
  animation-like effects. 
  If you leave off the seconds, PGSHOW
  will wait for a keypress.

  Multiple filename-seconds pairs can
  be specified on the command line.
  PGSHOW will show one file after the
  other.

  The default file extension is .PGC,
  it can be omitted.

  Where do I get .PGC files?
  --------------------------
   
  There are 6 .PGC files included in
  the distribution:

  GORBY.PGC   Gorbachev
  FUJI.PGC    Atari Computer Logo
  PORTF.PGC   Portfolio Logo
  BOMB.PGC    A bomb with lit fuse
  USA.PGC     A map of the U.S.
  SPIRAL.PGC  A rectangular spiral

  Also included in the distribution
  is a batch file called ademo.bat.
  It is to be used with Warren
  Flarity's ADEMO pictures to show
  off the new animation capabilities
  of PGSHOW.
    
  You can also create your own .PGC
  files with tools that will be
  forthcoming from Software Vineyard:

  PGEDIT  A .PGC file editor that
          runs on a desktop PC.
          Has it's own GUI and some
          nice features. Requires
          VGA, 512K, and Microsoft(R)
          compatible mouse.
          (Available now)

  PGDUMP  A screen dump utility to
          dump graphic screens from
          within other programs.
          (ETA September 1991)

  PGLIB   A library of machine
          language routines to add
          to your own C programs for
          reading and writing .PGF
          files.
          (Available now)

  PGC Grabber for the Mac
          A program that runs on the
          Mac and allows you to grab
          the upper left-hand corner
          of a MacPaint image and
          save it as a PGC file.
          (Available now)

  PGC Grabber for the Atari ST
          A program that runs on the
          ST and allows you to grab
          any part of a NEO, DEGAS,
          or DEGAS ELITE picture and
          save it as a PGC file.
          (Available June 1991)

  All of the above programs are going
  be Public Domain and free to all!

  PBASIC 3.1 and above have commands to
  support reading, writing, and
  showing PGC files.
  (*PBASIC is (c)1991 BJ Gleason)
  
  The .PGC format
  ---------------

  The PGC (compressed) format was
  developed jointly by Don Messerli
  of Software Vineyard and BJ Gleason
  of Thin Air Labs.
  The format is non-proprietary.  The
  specification is in the file
  PGCSPEC.ZIP.  We encourage all who
  are developing graphics applications
  for the Portfolio to support the PGC
  format.  It is my hope that all PGF
  files be converted to PGC format and
  that people forgive me for jumping
  the gun with the PGF format.  Some
  programs will continue to create PGF
  files.  They can be converted with
  PGCOMP.ZIP
  
  What if I find bugs?
  --------------------

  Please report any bugs and send
  comments to Don Messerli

  Compuserve    72500,1671
  GEnie         DMESS

  Revision History
  ----------------
  Version  2.1    06-01-91
  - Speed increase of 20% through
    better coding.

  Version  2.0    01-06-91
  - Uses direct writes to LCD
    controller memory to increase
    speed and eliminate visible
    screen refresh.
  - Specifying 0 seconds causes
    no delay.  Earlier versions
    waited for a keypress.

  Version 1.10  12-29-90
  -No longer support .PGF files.
  -Added support for .PGC files
   which are compressed graphic files.

  Version 1.01  12-23-90
  -Fixed bug where multiple filenames
   with no seconds specified caused
   PGSHOW to skip next filename
  -Made .PGF default file extension,
   so it doesn't have to be typed on
   command line.

  Version 1.00  12-16-90
  Initial Release

  In Closing
  ----------

  Have fun with it!  Upload
  your graphic creations for
  others to enjoy.......
                        DM