home PDP-10 TOPS-20 Commands Reference Manual Top: Chapter 2 Command description

SAVE

Stores a copy of memory in an executable file.

Format

   @SAVE (ON FILE) filespec  (PAGES FROM) loc1 (TO) loc2, loc3 loc4, ...

where:

filespec

is the file specification under which you want to store the program.

Default filespec - program name.EXE

loc1 loc2,
loc3 loc4,
...

are pairs of octal numbers or symbolic expressions that specify the span(s) of memory pages you want to save.

Default loc1 loc2 - all assigned pages of memory from 0 to the highest page number of the highest existing section

Output

Status of Files

If you use recognition of the file specification, the system prints !Old Generation!, !New Generation!, or !New File!, to indicate its status on disk, or !OK! if saved on a non-disk device.

Hints

Saving Programs Before Running Them

When you load a source or object program using the LOAD command, save it using SAVE before running it. Then you can run it in the future using RUN, without first loading it using a LOAD-class command. This is also true if you save the program after running it, but it will then be in a post-run state.

More Information

For more information about saved files, see the TOPS-20 Monitor Calls Reference Manual.

Restriction

Saving an Execute-only Compiler

It is illegal to use the SAVE command after using the LOAD command for an execute-only compiler. An alternative is to use LINK with the LOAD command and the /SAVE switch.

Related Commands

GET for putting a saved file into memory
LOAD for putting a source or object file into memory
RUN for running a saved program
START for starting the program in memory

Examples

  1. Save the program currently in memory. 
    @SAVE
 TESTF1.EXE.6 Saved
  2. Mount a magnetic tape in write-enabled mode. Use the GET command to put an executable program into memory, then save it (specifying a new filename) on tape and on disk. Finally, start the program, which is still in memory. 
    @MOUNT TAPE LAT:/WRITE-ENABLED
[Mount request LAT: queued, request-ID 415]
[Tape set LAT, volume LAT mounted]
[LAT: defined as MT2:]
@GET TESTF1
@SAVE LAT:TAP.EXE
 MT2:TAP.EXE Saved
@SAVE
 TAP.EXE.1 Saved
@START

THIS IS A TEST.

CPU time: 0.04  Elapsed time: 0.17