[Coladam] Re : More fun adventures in CP/M

Daniel Bienvenu newcoleco at yahoo.fr
Fri Feb 19 20:51:32 CET 2010

The following came from a paper titled "Everything you wanted to know to start you off with CP/M". It confirms your supposition about compression.

With CP/M, to get the listing of the files, you'll type DIR<Ret> and this is what you might see :-

A:> FILENAME.COM (Runnable file)
A:> FILENAME.BAK (Backup file)
A:> FILENAME.LBR (Library file)
A:> FILENAME.DOC (Documentation file)
A:> FILENAME.ARK (Archive file similar to library file but further compressed - use UNARCxx.COM to decompress)
A:> FILENAME.DZC (Crunched file - use UNCR.COM to decompress)
A:> FILENAME.DQC (Squeezed file - use UNSQ.COM to decompress)

You may find that a library file will contain a number of compressed files. These will have to be DELIBed and then decompressed in 2 seperate moves. Generally archived files can be extracted and decompressed in one move which is the main advantage of archive over library files.


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