Re: Old Fortran version

On Tue, 20 Feb 2007 15:50:20 -0800, glen herrmannsfeldt wrote:

George Baltz wrote:

Yes, the tape you have is in what Exec 8 (OS/2200 now) calls COPY,G
format, which is an image of the native storage of Program Files (sorta
like a PDS in OS/360 terms) on disk. The text of the programs is
wrapped in System Data Format (SDF), with control words before each
line, and even multiple versions of the same line (a built-in versioning
system).

You mean like a dump of a PDS? On disk, a PDS has a directory, followed
by the members with an EOF between each one. There are no added control
words. When written to tape, such as an IEHMOVE unloaded PDS, control
information has to be added, but it is no longer a PDS.

-- glen

Something like that. OS/2200 program files have similar structure
(directory followed by the individual texts), but each member (called
an element, in Univac-speak) is formatted in SDF, which includes the
control words. These specify the line length, at which cycle (or
revision) each line was added or deleted, and the character set (ASCII/FD).

The @COPY,G format is a disc (drum?) image of the program file. If the
tape were made with @COPOUT, it would be like the IEHMOVE above (I think -
sorry, but the last IBM mainframe I worked on was a 7094.)


--
George Baltz N3GB
Computer Sciences Corp Rule of thumb: ANYthing offered
@NOAA/NESDIS/IPD by unsolicited email is a hoax,
Suitland, MD 20746 ripoff, scam or outright fraud.

.

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