TOPS-20 Commands Reference Manual

CSAVE

Makes a non-sharable copy of the program in memory and stores it in a file, in compressed executable format.

Format

@CSAVE (ON FILE) filespec (WORDS 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

Caution

Inefficiency of CSAVE Compared to SAVE

The CSAVE command saves in a compressed-formatted file whatever program the system finds in memory. When the file is returned to memory, this format prevents other users from sharing the in-memory copy of the file. Therefore you should ordinarily use the SAVE command instead for storing programs in executable format.

Related Commands

GET	for putting a saved file into memory
LOAD	for putting source or output files into memory
RUN	for running executable programs
SAVE	usual command for saving programs in executable format

Examples

Save your currently loaded program in compressed executable format.
```
@CSAVE
 DMN.EXE.1 SAVED
```

Mount a magnetic tape set. Then load an ALGOL program and save it in three places in executable format: once in a disk file under the same filename, again in a disk file under a new filename, and once on magnetic tape.

@MOUNT TAPE TAPBAK: /WRITE-ENABLED
[Mount Request TAPBAK Queued, Request-ID 140]
[Tape set TAPBAK, volume TAPBAK mounted]
[TAPBAK defined as MT2:]
@LOAD TESTA1
LINK:   Loading

EXIT
@CSAVE
 TESTA1.EXE.1 Saved
@CSAVE BAK
 BAK.EXE.1 Saved
@CSAVE MT2:
 MT2:BAK Saved
@DISMOUNT TAPE TAPBAK:
[Tape dismounted, logical name TAPBAK: deleted]

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