-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
Behalf Of Charles Mills
Sent: Tuesday, February 20, 2007 5:08 PM
To: [email protected]
Subject: Re: IBM S/360 series operating systems history
<SNIP>
TOS was a piece of work! Every time you linkedited a program (all
executable
programs in DOS/TOS in those days lived in SYSRES) it copied the SYSRES
from
tape to tape, kind of like a "good old days" update of the customer
master
file.
I don't recall if TOS supported overlay structures. That is not an idea
whose time has come: loading overlay segments from tape.
<SNIP>
TPS supported overlay structures (loaded them from the SYSRES tape), so
I just figured its bigger brother, TOS would do the same. I had a friend
who worked for Holiday Inns at Holiday City in Memphis back about 1977
where they were still running TOS (I think he had 128K) with 2311 disk
drives (if I remember the model correctly). I do not know if they
supported ISAM, BDAM or just SAM back then (what a waste of DASD if they
could only do SAM).
And why a copy of the SYSRES puzzles me. TPS actually updated the SYSRES
during a "GEN" process (where I would add in a module or replace one),
not during a run where modules were being pulled in to core.
And to someone else's post about this, an assembly took all 4 of our
tape drives, and the minimal assembly (NO macros) took 30 minutes (give
or take about 15 seconds). Most of that was just initializing things on
the work tapes!!! I say that because I used:
TEST START x'1000'
USING *,R3
NOPR 0
END TEST
A real assembly (that would expand to about 1K in size) with 3 DTFs took
about an hour. One learned to use REP cards, and clearly notate on the
listings what was zapped and why.
Later,
Steve Thompson
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