Function
Outputs a list of the operator's numbers of magnetic tape decks that are available from the loading of magnetic tapes.
Format
In both cases the parameter is optional. If it is omitted then the numbers of any available tape decks are output; if a standard characteristic has been declared by means of the STAPE GIN macro then only decks with the standard characteristic will be listed. If MODEnumber is specified, then only the number of decks that can be switched to the specified mode are output. (For details of modes see the MODE command.) If PRperipheral property name is specified then only the number of decks with the peripheral property name specified are output.
Forbidden contexts
NOT OPERATOR, REMOTE
Execution
A reply is output on the operator's console in the format
UNITS AVAILABLE ARE: decimal integer
decimal integer ...
The decimal integers are the operator's numbers of the magnetic
tape decks that are disengaged or engaged but not in use at the time the
decks were examined. If there are no decks available, the reply
NO UNITS AVAILABLE
will be output.
No attempt is made to switch any decks to the specified mode.
Examples
TRANSPORTS
Error Messages
PARAMETER FORMAT ERROR
ILLEGAL MODE GIVEN
ILLEGAL COMBINATION OF PROPERTIES