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From: graham@smaug.enet.dec.com
Newsgroups: comp.sources.wanted
Subject: Re: What does this assembler code do?
Keywords: VAX, VMS, backup
Message-ID: <1990Dec4.182620@smaug.enet.dec.com>
Date: 4 Dec 90 23:31:53 GMT
References: <RALPH.90Dec4163345@orion.laas.fr>
Sender: newsdaemon@shlump.nac.dec.com
Reply-To: graham@smaug.enet.dec.com ()
Distribution: comp
Organization: Digital Equipment Corporation
Lines: 14

In article <RALPH.90Dec4163345@orion.laas.fr>, ralph@laas.fr (Ralph P. Sobek)
writes:
|>The following embedded assembler code belongs to some C language code
|>for reading VAX VMS Backup tapes under Unix.  Maybe this would compile
|>under Ultrix. 

It appears to convert a 64-bit absolute VMS time value (the address of which is
passed
as the first parameter to the routine) into the number of seconds since 1am on
1-JAN-1970!

It does this by subtracting 0x007C956FADAFA800 ( 1-JAN-1970 01:00:00.00) from
the time
value passed and dividing the result by 10,000,000