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       cckddiag - Hercules CCKD DASD diagnostic tool


       cckddiag [options...] filename


       Hercules  support  tool  used  to  assist in the diagnosis of CCKD DASD
       problems.  Operates on Hercules CCKD DASD volumes  in  read-only  mode,
       and   displays  various  information  contained  in  CCKD  DASD  files.
       Effective usage requires  internal  knowledge  of  Hercules  CCKD  DASD


       The  following  options  are used to specify which portions of the CCKD
       DASD file are to be  displayed.   Options  may  not  be  combined;  for
       example, -cd1 is not a valid option.  Surround each option by blank(s).

       Argument numbers may be specified either in decimal or hexadecimal.  If
       the  number  begins with the characters 0x the number is presumed to be
       hexadecimal; else the number is presumed to  be  decimal.   No  numeric
       overflow checking is done, the user is assumed (!) to know what they’re

       Options are divided  into  three  categories:  global  options,  track-
       related options, and the offset option.

Global options

       specifies the Hercules CCKD DASD filename (sometimes referred to as the
       DASD image file)

       display version and exit

       display DEVHDR

       display CDEVHDR

       display L1TAB  (note this option is a numeric one)

       enable debug output

Track-related options

       To direct cckddiag to a specific track, two options  are  provided:  -a
       and  -r.   The  remaining  track-related  options  describe the kind of
       output desired.  The TRKHDR for the track is displayed for  all  track-
       related options.

   -a cc hh
       display  absolute  CCHH  data  -  where  cc and hh are respectively the
       cylinder number (relative zero), and the head number (relative zero).

   -r tt
       display relative track data - where tt is the  track  number  (relative

       display  L2TAB  -  requires  a  corresponding -a or -r specification to
       direct cckddiag to a specific track.

       display track data - displays the COUNT, KEY, and DATA record summaries
       for the data residing on the indicated track.

       hex  display  track  key/data  -  displays  the  KEY  and DATA records’
       contents in hexadecimal display format for the indicated  track.   Some
       repetitive data may be omitted from the hex display output.

Offset option

       This  option  provides  the  ability to examine any portion of the CCKD
       file, as an alternative to track specification.

   -o oo ll
       hex display data at offset oo of length ll.


       cckd(4) the Hercules emulator homepage. which describes
              the Hercules CCKD DASD facility.


       2003-02-07 originally written by James M. Morrison

                                  2003-02-03                       cckddiag(1)