ICL 1900 Series George 3 Operating System Commands

SAVE (SV)

Function

Saves the state of the current core image in a file.

Format

SAVE file name,device type

The file name is that of a filestore file to which the core image is to be written. The device type is optional. If present, it must be either *CP (if a card file is required) or *DA (if a disc file is required). If the parameter is absent, GEORGE assumes the device type to be *DA.

If the device type is *CP, the file name can be the name of an existing serial file to which the user has WRITE access. Otherwise a file with the specified name will be created.

The TRAPGO entrant description qualifier may be specified with the SAVE command to set the required traps for the file.

Forbidden contexts

NO CORE IMAGE

Execution

A binary dump of the program is produced in a format acceptable to the LOAD, LOADENTER, RESTORE and RESUME commands and to an Operator's Executive. The file name cannot be obeyed as a macro.

If the program has any peripherals, a message is output to the monitoring file system for each one in the form

    peripheral name NOT SAVED

This means that if the saved file is restored, these peripherals will be lost.

Examples

SAVE SVFILE(3)
Reply *LP0 NOT SAVED

Notes

1. The SAVE command does not alter the state of a program in any way.
   
   
2. When an overlay program is loaded, the program file is (traps permitting) ASSIGNed to the program so that the program can access its overlays. This file is released by SAVE as are all other peripherals connected to the program. This also applies to an ONLINEd magnetic tape in the case of a program overlaying from magnetic tape.
   
   If a program is loaded from a basic peripheral type file, the 'retain load peripheral' bit may be set so that the program can read data following the binary program in the file. As above, traps permitting, the file is ASSIGNed to the program by LOAD and released by SAVE. If this file is ASSIGNed again when the saved file is restored, it is not repositioned at the start of the data.
   
   
3. It should be noted that the following details in the saved file are taken from the current state of the program and they will be attributed to the program when it is reloaded.
   
   The request slip in the saved file contains the size of the core image at the time the SAVE command was issued. A supplementary request slip will be formed if one existed whent he program was first loaded or if the program was nor in compact mode when the SAVE command was issued. In either case the current branch and address modes will be recorded in the supplementary request slip.

Error Messages

FILE NAME PARAMETER MISSING
z IS NOT A CORRECT PERIPHERAL NAME