Type ASSEMBLE
Source Lines : 737
Fixes Applied : 1
Most Recent Version : Tuesday, December 12, 1978
Last Fix ID : [R10475DS]

Module

     DMSDSK (DISK)

Function

       TO DUMP A  DISK FILE TO CARDS, OR TO  LOAD FILES FROM
       CARDS TO DISK.

Attributes

       TRANSIENT (WITH SYSTEM OPTION); SERIALLY REUSABLE.

Operation

       THE OPERATION OF DISK DEPENDS  ON WHETHER THE CALLING
       PROGRAM SPECIFIES DUMP OR LOAD.

       DUMP:   DISK COPIES  THE  FILE  DESIGNATION FROM  THE
       PARAMETER  LIST INTO  BYTES  58 -  76  OF AN  89-BYTE
       BUFFER. (THE FIRST  FOUR BYTES OF THE  BUFFER CONTAIN
       AN    IDENTIFIER    CONSISTING   OF    AN    INTERNAL
       REPRESENTATION OF  A 12-2-9 PUNCH AND  THE CHARACTERS
       'CMS'.)   THEN    DISK   TEMPORARILY    CHANGES   THE
       CHARACTERISTICS OF THE FILE IN  THE 40-BYTE FST ENTRY
       TO MAKE IT APPEAR AS  A FILE OF 800-BYTE FIXED-LENGTH
       RECORDS.  (THE CORRECT FST ENTRY IS RESTORED WHEN THE
       FILE HAS  BEEN DUMPED,  OF COURSE.)   DISK MOVES  THE
       INITIAL VALUE FOR SEQUENCING
       (001)  INTO BYTES  77-80 OF  THE  BUFFER.  DISK  NEXT
       CALLS THE DMSBRD FUNCTION
       PROGRAM TO READ  THE FIRST 50 BYTES  OF THE TEMPORARY
       COPY INTO
       BYTES 6-55 OF THE BUFFER AND THEN THE DMSCIO FUNCTION
       PROGRAM TO PUNCH
       THE CONTENTS OF THE BUFFER.  HAVING PUNCHED THE FIRST
       CARD,  DISK  INCREMENTS THE  SEQUENCE  NUMBER  (BYTES
       77-80 OF THE  OUTPUT BUFFER) AND OVERLAYS  BYTES 6-55
       OF THE BUFFER WITH THE NEXT 50 BYTES OF THE FILE
       BY CALLING DMSBRD.   IT THEN PUNCHES THE  CONTENTS OF
       THE
       BUFFER.    DISK  REPEATS   THIS   PROCESS  FOR   EACH
       SUBSEQUENT 50  BYTES OF  DATA IN  THE TEMPORARY  DISK
       FILE.   WHEN  THE END-OF-FILE  IS  ENCOUNTERED,  DISK
       GENERATES AN  END CARD (ONE WITH  N IN COLUMN  5) AND
       PUNCHES IT,