Console Tape Messages

Unique CA 1 console messages are issued to the operator as conditions warrant in standard operating system format. For example, when an NL or BLP tape is opened, the operator is asked to enter the volume serial number. For a specific volume request, the volume serial number entered must be the same as specified in the JCL; if not, CA 1 assumes the wrong tape is mounted and has the tape demounted.

For a nonspecific request, the volume serial number must be replied twice. This gives the operator a chance to correct an incorrect response. The volume serial number is then used to access the TMC information.

Provisions are available to process nonresident tapes whose volume serial numbers are identical to those in the CA 1 controlled tape library. When this type of tape is mounted for output and the JCL specifies the keyword indicating a nonresident tape (LABEL=EXPDT=98000 or ACCODE=xCANORES), the operator is asked to verify that the tape actually is a nonresident tape.

Nonresident tapes are protected with the standard system type protection. That is, for SL tapes, if the HDR1 expiration date is greater than the current date, the operator has the option to override the expiration date and allow output, or to demount the tape.

CA 1 also provides protection in the event that dual-density drives are in use, or label types are mixed within the environment. CA 1 system options LCHG and DCHG determine whether dynamic label or density changes can occur in the real-time environment. Appropriate demounts or verification messages are issued, depending on the options in use. System option TCHG controls whether recording technique (TRTCH) changes are allowed.

Note: For more information about console messages and valid responses, see the Message Reference Guide.