mbler List
on behalf of robi...@dodo.com.au
Sent: Sunday, August 9, 2020 10:53 AM
To: ASSEMBLER-LIST@LISTSERV.UGA.EDU
Subject: Re: Case Study: IBM SYSTEM/360-370 ARCHITECTURE (1987)
On 2020-08-09 15:05, Seymour J Metz wrote:
How is the ASCII bit relevant to teletypes? It only affects the
handling o
on behalf
of robi...@dodo.com.au
Sent: Sunday, August 9, 2020 10:53 AM
To: ASSEMBLER-LIST@LISTSERV.UGA.EDU
Subject: Re: Case Study: IBM SYSTEM/360-370 ARCHITECTURE (1987)
On 2020-08-09 15:05, Seymour J Metz wrote:
> How is the ASCII bit relevant to teletypes? It only affects the
> ha
: IBM Mainframe Assembler List
on behalf of Robin Vowels
Sent: Saturday, August 8, 2020 11:40 PM
To: ASSEMBLER-LIST@LISTSERV.UGA.EDU
Subject: Re: Case Study: IBM SYSTEM/360-370 ARCHITECTURE (1987)
- Original Message -
From: "Steve Smith"
To:
Sent: Sunday, August 09, 2020 10:57
Assembler List on behalf
of Leland Bond <0d7433ac18a9-dmarc-requ...@listserv.uga.edu>
Sent: Sunday, August 9, 2020 2:52 AM
To: ASSEMBLER-LIST@LISTSERV.UGA.EDU
Subject: Re: Case Study: IBM SYSTEM/360-370 ARCHITECTURE (1987)
The source for the ISPF/PDF SVC allowing it to run I
My discussion was about the architecture. The fact that it wasn't
supported by the OSes of the day may be true, but that doesn't mean it was
"prevented", or *couldn't* be used. If customers thought it was useful,
they could have asked IBM to support it, or implemented it themselves. The
salient
-LIST@LISTSERV.UGA.EDU
> Subject: Re: Case Study: IBM SYSTEM/360-370 ARCHITECTURE (1987)
>
> But do remember that in Ye Gude Auld Days, there was a widely known
> "magic" SVC which granted authorization to the user.
>
> On 8/8/20, Doug Wegscheid wrote:
>> Site-s
:20 PM
To: ASSEMBLER-LIST@LISTSERV.UGA.EDU
Subject: Re: Case Study: IBM SYSTEM/360-370 ARCHITECTURE (1987)
But do remember that in Ye Gude Auld Days, there was a widely known
"magic" SVC which granted authorization to the user.
On 8/8/20, Doug Wegscheid wrote:
> Site-specific
/~smetz3
From: IBM Mainframe Assembler List on behalf
of Charles Mills
Sent: Saturday, August 8, 2020 5:19 PM
To: ASSEMBLER-LIST@LISTSERV.UGA.EDU
Subject: Re: Case Study: IBM SYSTEM/360-370 ARCHITECTURE (1987)
Or a dozen or more other non-magic ways
: IBM Mainframe Assembler List on behalf
of Charles Mills
Sent: Saturday, August 8, 2020 7:53 PM
To: ASSEMBLER-LIST@LISTSERV.UGA.EDU
Subject: Re: Case Study: IBM SYSTEM/360-370 ARCHITECTURE (1987)
I am not suggesting anything nefarious or in violation of the Statement. A
program that is linkedited
PM
To: ASSEMBLER-LIST@LISTSERV.UGA.EDU
Subject: Re: Case Study: IBM SYSTEM/360-370 ARCHITECTURE (1987)
- Original Message -
From: "Steve Smith"
To:
Sent: Sunday, August 09, 2020 10:57 AM
Subject: Re: Case Study: IBM SYSTEM/360-370 ARCHITECTURE (1987)
> The ASCII feature of S
- Original Message -
From: "Steve Smith"
To:
Sent: Sunday, August 09, 2020 12:23 PM
Sheesh... I missed it somehow, but it is in there. ED & EDMK did support
ASCII mode, and used x'3x' zones in that case.
This old, possibly original
The "-0" version of IBM manuals is always the
- Original Message -
From: "Charles Mills"
To:
Sent: Sunday, August 09, 2020 11:29 AM
ED was not part of the original S/360 instruction set? Did you look under
Decimal Instructions?
It isn';t under "Decimal Instructions".
Try the chapter, Logical Instructions.
---
This email has
- Original Message -
From: "Steve Smith"
To:
Sent: Sunday, August 09, 2020 10:57 AM
Subject: Re: Case Study: IBM SYSTEM/360-370 ARCHITECTURE (1987)
The ASCII feature of S/360 probably wasn't used because it's nearly
useless.
What? See my earlier report that no IBM
Sheesh... I missed it somehow, but it is in there. ED & EDMK did support
ASCII mode, and used x'3x' zones in that case.
This old, possibly original (it has no date), Principles of Operation was a
whopping 168 pages. But I haven't read the whole thing :-). ED & EDMK are
listed in the "Logical
@LISTSERV.UGA.EDU
Subject: Re: Case Study: IBM SYSTEM/360-370 ARCHITECTURE (1987)
The ASCII feature of S/360 probably wasn't used because it's nearly
useless. Turning on ASCII mode caused PACK & CVD to generate ASCII sign
codes and UNPK to generate ASCII zone codes. As far as I can tell, th
The ASCII feature of S/360 probably wasn't used because it's nearly
useless. Turning on ASCII mode caused PACK & CVD to generate ASCII sign
codes and UNPK to generate ASCII zone codes. As far as I can tell, that's
it. I'd say that the much later PKA & UNPKA instructions make a lot more
sense
-Original Message-
From: IBM Mainframe Assembler List On Behalf
Of Paul Gilmartin
Sent: Saturday, August 8, 2020 5:53 PM
To: ASSEMBLER-LIST@LISTSERV.UGA.EDU
Subject: Re: Case Study: IBM SYSTEM/360-370 ARCHITECTURE (1987)
On 2020-08-08, at 15:19:05, Charles Mills wrote:
>
> Or a dozen o
Charles,What do you mean by other non-magic ways? If you mean back-door
authorization hacks then I have to wonder about there being a dozen or so
methods that rely on coopting a mechanism other than an SVC/PC routine, a TRAPx
or MC instruction handler or a Program FLIH
ASSEMBLER-LIST@LISTSERV.UGA.EDU
Subject: Re: Case Study: IBM SYSTEM/360-370 ARCHITECTURE (1987)
On 2020-08-08, at 15:19:05, Charles Mills wrote:
>
> Or a dozen or more other non-magic ways of getting into supervisor state.
>
How does this interact with IBM's Statement of Integri
I know of at least one event where a site specific SVC which allowed to
store into write protected storage
stopped a whole MVS system, involving thousand of users (IMS, TSO,
Batch, DB2, during day shift),
because the store went into address zero "by mistake".
Kind regards
Bernd
Am
On 2020-08-08, at 15:19:05, Charles Mills wrote:
>
> Or a dozen or more other non-magic ways of getting into supervisor state.
>
How does this interact with IBM's Statement of Integrity:
https://www.vm.ibm.com/devpages/SPERA/istatmnt.html
...
IBM will accept all APARs that describe
Subject: Re: Case Study: IBM SYSTEM/360-370 ARCHITECTURE (1987)
But do remember that in Ye Gude Auld Days, there was a widely known
"magic" SVC which granted authorization to the user.
On 8/8/20, Doug Wegscheid wrote:
> Site-specific SVC to do so?
>
> On Saturday, August 8, 20
The Magic SVC is still at large, along with functionally analogous
abominations such as:o The Prodigal PC Routine.o The Munificent MC Function.o
The Front-ended (Program) FLIH.
These are all harder to discover than a back-door authorization SVC, but all
can be found
On 2020-08-08, at 11:20:25, Robert Netzlof wrote:
>
> But do remember that in Ye Gude Auld Days, there was a widely known
> "magic" SVC which granted authorization to the user.
>
"Widely known"? But wasn't it always site-specific, never
distributed by IBM in a base system? Likewise
But do remember that in Ye Gude Auld Days, there was a widely known
"magic" SVC which granted authorization to the user.
On 8/8/20, Doug Wegscheid wrote:
> Site-specific SVC to do so?
>
> On Saturday, August 8, 2020, 12:11:14 PM EDT,
> wrote:
>
> Interesting are the two paragraphs on page
Site-specific SVC to do so?
On Saturday, August 8, 2020, 12:11:14 PM EDT, wrote:
Interesting are the two paragraphs on page 302, bottom RHS.
Case says that nobody used the ASCII capability of the S/360.
Padegs says that "none of our operating systems were [sic] programmed
to turn in
Interesting are the two paragraphs on page 302, bottom RHS.
Case says that nobody used the ASCII capability of the S/360.
Padegs says that "none of our operating systems were [sic] programmed
to turn in the [ASCII] bit".
So, no-one was able to use the ASCII facility.
On 2020-08-08 12:19, Jim
Study: IBM SYSTEM/360-370 ARCHITECTURE
(1987)
I liked the question:
"As The Principles of Operation is a fairly short
manual-570 pages. How can you describe the architecture in so few pages?"
Tony Thigpen
At 8/7/2020 10:19 PM, Jim Mulder wrote:
https://www.cs.tufts.edu/comp/150FP/archive/alfred-spector/spector87ibm.pdf
Jim Mulder z/OS Diagnosis, Design, Development, Test IBM Corp.
Poughkeepsie NY
THANKS!
Dave Cole
:-)
I liked the question:
"As The Principles of Operation is a fairly short
manual-570 pages. How can you describe the
architecture in so few pages?"
Tony Thigpen
Jim Mulder wrote on 8/7/20 10:19 PM:
https://www.cs.tufts.edu/comp/150FP/archive/alfred-spector/spector87ibm.pdf
Jim Mulder z/OS
https://www.cs.tufts.edu/comp/150FP/archive/alfred-spector/spector87ibm.pdf
Jim Mulder z/OS Diagnosis, Design, Development, Test IBM Corp.
Poughkeepsie NY
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