16 Dec
2015
16 Dec
'15
12:03 p.m.
On 12/16/2015 10:08 AM, Chuck Guzis wrote:
On 12/16/2015 07:57 AM, Paul Koning wrote:
Does the first block have a PSW looking thing in the appropriate start,
and an I/O program to boot the next record from the boot device?
IBM standard labels are older than ANSI. Then
again, IBM (in OS/360
at least) had something they called "ANSI label" that were not
actually ANSI at all. They used "8 bit ASCII" which was a bizarre
code created from standard 7 bit ASCII by moving one or two of the
bits (bit 6 to bit 7? I don't remember).
Then there's 6 bit ASCII/USASCII. I was trying to avoid using jargon
that some would not understand. I'm quite familiar with IBM EBCDIC
"SL" tape labels.
My point was that the CMS dumpfile tape isn't even a standard labeled
tape. It just starts out with the first block of data and ends with a
double filemark. No standard labels anywhere. Any non-CMS system
would not know what the heck the thing was.
--Chuck