If you (like me) have JPD but don't read japanese (like me too)
  this mail is your! =8^)

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  JPEG file decoder                                        JPD.COM      
  System: MSX2+, MSX Turbo R (V9958 only)
          MSXDOS2, and 2 segmentos of mapper or more (please more!)

  Copyright (c) 1995-1996 Hiroyuki_KAKAMI
  Specyal tanks to SEIGA
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  Sintax:

  JPD <file name>[.JPG] [options]


  Line command arguments:


  /H      : Display a short list about the available options

  /I      : Information about the JPEG file. You can use wildcards 

  /D<s>   : Specify the directory for store the captured pictures.
            It be wrote in BSAVE format. 
  
  /S[n]   : Specify the screen mode for display the JPEG files.
            The values are:

            0   - Soory the original DOC is in Japanese
            1,6 - Screen 12 (256x424) 19.268 colors
            2,7 - Screen  8 (256x424)    256 colors
            3,8 - Screen  7 (512z424)     16 colors

            The default value is 1. The values 6,7 and 8 specify
            the fast-view option (all pixes be are 4x4 size)

  /A      : (AUTO) adjust the screen automaticly(?)
                      H SIZE     ACTION
                    ========== ============
                     < 256      middle, 2x
                    256...511   middle
                    512...640   wide
                    641...1K    full

  /M      : (MIDDLE) aligns the image to middle screen


  /W      : (WIDE) stretch the image. The result can be fine. Is
            original image dependent.

  /F      : (FULL) full size.

  /C      : (COMPRESS) reduce the image size to fit in screen

  /X      : (EXTENDED) equal to /C but growning the picture.

  
  While the picture in displayed you can use:

  [SPC]   : next picture

  [ESC]   : quit and return to MSXDOS2

  [RET]   : stop the visualization

  [CSR]   : You can use the cursors keys [UP] and [DOWN] to
            do a SCROLL in image.

  [F1-3]  : screen-mode
            [F1] Screen 12 (256x424) 19.268 colors
            [F2] Screen  8 (256x424)    256 colors
            [F3] Screen  7 (512z424)     16 colors

            Shift+[F1-F3] enable the fast-view mode

  [L] [;] : left
  [R] [:] : right
  [J]     : scale-down
  [K]     : scale-up      


  All informations listed above can be obtained using: JPD /H in
  MSXDOS2 Prompt. The JPD.DOC is originally in japanese (JIS). 

  
  Sorry my english... :(
---
Giovanni Nunes - http://www.geocities.com/ResearchTriangle/2472/