ICL 1900 Series George 3 Operating System Commands

REDON (RO)

Function

Simulates a command issued by a specified peripheral or indicates to the Librarian that a special tape or disc is to be loaded or engaged.

Format

Basic Peripherals
REDON number,command
The first parameter gives the operator's number of the peripheral. The second parameter is the command that is to be obeyed as if it has been issued from this peripheral.
Magnetic Tape
REDON number,magnetic tape description
number is the geographical number of the deck
magnetic tape description has one of two forms:
- For Xenotapes
  (tape serial number,name(generation number/reel number))
  where tape serial number must have an X appended to it. The other components of the description are used for checking and are optional.
- For non-standard tapes
  name(generation number/reel number)(NONSTANDARD)
  In this case name is the reference for the tape and must be included. The other details are optional.
Discs
REDON number,serial number
or
REDON number(storage unit),serial number
where number is the geographical number of the device and storage unit is a number from zero upwards indicating the part of the device referred to (if the unit is partitioned). The second format should only be used if the unit referred to contains more than one storage unit.

Forbidden contexts

NOT OPERATOR,REMOTE

Execution

Basic Peripherals
REDON can be used to simulate commands issued from paper tape or card readers. Thus it can be used to identify unheaded paper tape or cards. For example:

REDON 27,DOCUMENT FRED

will cause GEORGE to identify the paper tape (for example) on device 27 as the document called FRED.

If the peripheral specified is WRONGed a command error is generated.

If the operator's number of a peripheral of any other type is specified, a command error is generated.
Magnetic Tape
The next tape to be loaded on the specified deck will have its first block checked to ensure that it is not a secure tape. In the case of a Xenotape such details are given in the tape description and will be checked against the tape and the tape will be left positioned after the header label. Non-standard tapes will be left positioned at the start of the tape.

When a tape is RETURNed to the pool it will have POOL TAPE written to its header label only if it is already loaded. If a tape is RETURNed when it is not loaded, a request to load the tape will not be generated and the tape will not have POOL TAPE written to its header label.
Discs
The command indicates that the specified unit is non-standard and may be accesses only by a Q or S trusted program using either mode #1600 or mode #1700. In the non-standard device is disengaged, the command does not terminate until the device is engaged.

Examples

REDON 32,(276212X)	Prepares for the loading of the Xenotape on deck 32
REDON 31,NEWTAPE(NONSTANDARD)	Prepares for the loading of the non-standard tape, to be addressed as NEWTAPE on deck 31
REDON 41(2),#237214	Indicates that the third storage unit on unit 41 is non-standard

Error Messages

Basic Peripherals
COMMAND PARAMETER MISSING
NOT ALLOWED TO USE UNIT z
THE OPERATOR'S NUMBER PARAMETER IS MISSING
UNIT z IS ALREADY ALLOCATED
UNIT z IS NOT ON THIS INSTALLATION
UNIT z IS WRONGED
Magnetic Tape
UNIT z IS ALREADY ALLOCATED
UNIT z IS WRONGED
UNIT z IS NOT ON THIS INSTALLATION
TAPE ON UNIT z HAS FAILED
z DOES NOT SPECIFY NON-STANDARD OR XENOTAPE
NON-STANDARD HEADER LABEL ON UNIT z
TAPE ON UNIT z IS SECURE
ENTRANT DESCRIPTION PARAMETER MISSING
LOCAL NAME NOT SPECIFIED
RESERVATION ON UNIT z CANCELLED
XENOTAPE ON UNIT z NOT CORRECTLY IDENTIFIED
XENOTAPES MUST NOT BE NONSTANDARD
Discs
REDON HAS BEEN OBEYED FOR UNIT z
A STANDARD SU IS LOADED ON UNIT z
NON-STANDARD SU z IS NOT AVAILABLE
SERIAL NUMBER z IS ALREADY ONLINE
SERIAL NUMBER PARAMETER MISSING
UNIT z IS NOT ON THIS INSTALLATION
SERIAL NUMBER IS INVALID