READCARD When the READCARD * command is issued, control cards encountered in the
input card stream are displayed at the terminal (see message
DMSRDC702I), to indicate the names assigned to each file. DMSRDC'OlI NULL FILE The spooled card reader contains no records after the control card.
DMSRDC702I :READ filename filetype fn (other information'
A READ control card has been processed; the designated file is
being written on disk.
DMSRDC702I READ CONTROL CARD IS MISSING. FOLLOWING ASSUMED: DMSRDC702I :READ READCARD CMSUTl A1 The first card in the deck is not a READ control card. Therefore,
the file READCARD CMSUT1 A1 is created.
DMSRDC73AI RECORD LENGTH IS 'nnn' BYTES The records being read are not 80 bytes long; this message gives
the length. DMSRDCOOAE DEVICE 'cuu' {INVALID OR NONEXISrENTIUNSUPPORTED DEVICE TYPE} RC=36 DMSRDCOq2E NO FILEID SPECIFIED RC=2Q DMSRDCOSQE INCOMPLETE FILEID SPECIFIED RC=2Q DMSRDC062E INVALID * IN FILEID RC=20 DMSRDC05QE DISK 'mode' NOT ACCESSED RC=36 DMSRDC10SS ERROR 'nn' WRITING FILE 'fn ft fm' ON DISK RC=100 DMSRDC12QS ERROR READING CARD FILE RC=100 DMSRDC205W READER EMPTY OR NOT READY RC=8
Section 2. CMS 157

RELEASE RELEASE Use the RELEASE command to free an accessed disk ana make the files on
it unavailable. The format of the RELEASE command is: r ----------_._------_._-_._-----, , RELease , { CUU} (DET()]] , mode , L _____ _
cuu is the virtual device address of the disk that is to be released.
mode Valid addresses are 001 through 5FF for a
basic control mode and 001 through FFF for a extended control mode. virtual machine in
virtual machine in
is the mode letter at which the disk is currently accessed.
DET specifies that the disk is to be detached from your virtual
machine configuration; CMS calls the CP command DETACH.
1. If a disk is accessed at more than one mode letter r the RELEASE cuu
command releases all modes. If you access a aisk specifying the
mode letter of an active disk r the first disk is released.
2. YOl cannot release the system disk (S-disk). 3. When a disk is releasedr the user file directory is freed from storage and that storage becomes available for other CKS commands and programs. When you release a read/write CKS disk r either with the RELEASE command or implicitly with the FORMAT command, the user
file directory is sorted and rewritten on disk; user(s) who may
subsequently access the same disk may have a resultant favorable
decrease in file search time.
4. When a disk is released, any read-only extensions it may have are
not released. The extensions may be referred to by their own mode
letters. If a disk is then accessed with the same mode as the
original parent disk, the original read-only extensions remain extensions to the new disk at that mode.
5. In CMS/DOS, when you release a disk, any system or programmer unit assignments made for the disk are unassigned. DASD cuu DETACHED
This is a CP message that is issued when you use the DET option.
It indicates that the disk has been detached.
158 VK/37Q CMS Command and Macro Reference