In [EMAIL PROTECTED], on 05/01/2007
at 11:25 AM, Patrick O'Keefe [EMAIL PROTECTED] said:
This calulates the offset of the middle element of a table FSVO
middle. r2 = table entry length
r3 = (non-zero) table length
BXLE R2,R2,* DOUBLE OFFSET UNTIL TAB SIZE
SRL
On Sun, 29 Apr 2007 13:55:24 -0300, Shmuel Metz (Seymour J.)
[EMAIL PROTECTED] wrote:
...
*All* instructions should be used with care and with adequate
documentation. You don't need new instructions to write obscure
code;
it's been done with BXH and BXLE.
...
From a binary search routine I
On Sat, 28 Apr 2007 17:41:44 EDT, Bill Fairchild wrote:
(2) so I can understand the code 6 months later
Or sometimes even the next week.
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Tom Marchant
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== Tom Marchant == wrote2007-04-30 14:29:
On Sat, 28 Apr 2007 17:41:44 EDT, Bill Fairchild wrote:
(2) so I can understand the code 6 months later
Or sometimes even the next week.
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04/28/2007 05:41 PM
Please respond to
IBM Mainframe Discussion List IBM-MAIN@BAMA.UA.EDU
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Re: latest Principles of Operation
In a message dated 4/27/2007 5:28:48 P.M. Central Daylight Time,
[EMAIL PROTECTED] writes:
Unless you have gotten so old you
On 30 Apr 2007 08:00:17 -0700, [EMAIL PROTECTED] (Thomas H Puddicombe)
wrote:
Unless you have gotten so old you can't remember what your own code does.
I have had that problem since way before I got old (or at least older).
The
two main reasons why I write lots of comments in my code:
(1)
In [EMAIL PROTECTED], on 04/27/2007
at 03:54 PM, Patrick O'Keefe [EMAIL PROTECTED] said:
And (from from earlier in this thread), it is very rare for a
carpenter to have to understand the internal workings of his tools
well enough to rebuild them to fulfill a new purpose.
And it is very rare
snip---
I once worked in an Assembler shop where the manager forbade the use of
BXH/BXLE because he couldn't grasp how they worked. I did get to see
some interesting dumps caused by BCT(R) loops gone awry, though. :-)
In a message dated 4/27/2007 5:28:48 P.M. Central Daylight Time,
[EMAIL PROTECTED] writes:
Unless you have gotten so old you can't remember what your own code does.
I have had that problem since way before I got old (or at least older). The
two main reasons why I write lots of comments
Bill, I totally agree. While I knew (I'm old, too) all the clever things I
could do in ASM/HLASM in OS/360 == early z/OS througout my career as a
sysprog writing system level code, it was imperative that I documented all
of my code and used documented operating system interfaces (even SVC
Rick Fochtman [EMAIL PROTECTED] wrote in message
news:[EMAIL PROTECTED]
--snip---
Complexity is far too often used as an excuse for incompetence or
laziness; not always or even most of the time, but still far too often.
You don't let a carpenter
On 27 Apr 2007 09:07:25 -0700, [EMAIL PROTECTED] (Dean Kent) wrote:
The human mind has a limited capacity for organizing information into
something meaningful. It would be interesting to see a graph showing the
percentage of people able to properly handle various levels of complexity,
and I
Dean Kent writes:
The human mind has a limited capacity for organizing information into
something meaningful. It would be interesting to see a graph showing the
percentage of people able to properly handle various levels of complexity,
and I suspect that as the complexity increases the
Howard Brazee [EMAIL PROTECTED] wrote in message
news:[EMAIL PROTECTED]
A lot of our smarts is in seeing patterns, simplifying what we are
looking for. Occasionally this kind of shortcut causes us to miss
things, but pattern recognition allows the chess master to ignore dead
ends that
(simplified) in the morph from cp67 to vm370.
so possibly still part of the recovery in the aftermath of future system
project ... recent reference in this thread
http://www.garlic.com/~lynn/2007i.html#31 Latest Principles of Operation
I was given the opportunity to reintroduce the resource manager
- Original Message -
From: john gilmore [EMAIL PROTECTED]
Newsgroups: bit.listserv.ibm-main
To: IBM-MAIN@BAMA.UA.EDU
Sent: Friday, April 27, 2007 10:57 AM
Subject: Re: latest Principles of Operation
Views like his are common, but they are also curiously parochial.
Someone
who wants
On Fri, 27 Apr 2007 17:57:12 +, john gilmore
[EMAIL PROTECTED] wrote:
Dean Kent writes:
The human mind has a limited capacity for organizing information
into something meaningful. ...
...
Views like his are common, but they are also curiously parochial.
Someone who wants to do physics
-Original Message-
From: IBM Mainframe Discussion List On Behalf Of john gilmore
Dean Kent writes:
[ snip ]
With programmers, on the other hand, we too often proceed
very differently.
Statement-level procedural languages like COBOL are
frequently subsetted, the use of
If the program can be done efficiently only by clever programming (and if that
efficiency is really
needed) then the clever programming needs to be accompanied by VERY clear
documentation.
Real programmers don't comment code.
It was hard to write; it should be hard to read!
(8-{}
-
Too busy
-Original Message-
From: IBM Mainframe Discussion List
[mailto:[EMAIL PROTECTED] On Behalf Of Patrick O'Keefe
Sent: Friday, April 27, 2007 3:55 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: latest Principles of Operation
snip
I seem to have lost the beginning of this sub-thread
On Fri, 2007-04-27 at 16:22 -0500, McKown, John wrote:
That's what I think started this fork() of the original therad.
Which of course made the whole thing too complex. Maybe we need to make
it simpler ...
D'oh - back where it started.
Time for my first coffee of the day.
Shane ...
://www.garlic.com/~lynn/2007i.html#25 Latest Principles of Operation
http://www.garlic.com/~lynn/2007i.html#26 Latest Principles of Operation
http://www.garlic.com/~lynn/2007i.html#31 Latest Principles of Operation
http://www.garlic.com/~lynn/2007i.html#43 Latest Principles of Operation
part
Unless you have gotten so old you can't remember what your own code does.
You start writing everything down.
I represent that remark.
IBM Mainframe Discussion List IBM-MAIN@BAMA.UA.EDU wrote on 04/27/2007
05:19:47 PM:
If the program can be done efficiently only by clever programming
(and
On 25 Apr 2007 12:33:54 -0700, in bit.listserv.ibm-main you wrote:
On Wed, 25 Apr 2007 14:16:47 -0500, Rick Fochtman wrote:
With the new instructions, I now count 751 instructions documented in the
POO. That's up a lot from the (IIRC) 143 for S/360.
It's called evolution, son. Like it or
--snip---
nominally the argument is that complexity contributes to confusion and
failures ... KISS is frequently better because it minimizes confusion
which can be major source of failures, vulnerabilities, threats and
exploits. however, another
Clark Morris wrote:
The frustrating thing is that there is no compiler switch to tell most
of the compilers that these instructions can be used because the
target is known. ISV's normally have to hang back on using these
instructions because the target processor may not have the
instruction.
Rick Fochtman wrote:
That increased instruction set allows for vastly increased capability,
in spite of the perceived complexity. Simple applications can still be
coded using simple instructions, but more complex requirements can be
met more simply and efficiently by using some of those added
-Original Message-
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
Behalf Of Edward Jaffe
Sent: Thursday, April 26, 2007 9:45 AM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: Latest Principles of Operation
Clark Morris wrote:
The frustrating thing
On Thu, 2007-04-26 at 12:26 -0300, Clark Morris wrote:
The frustrating thing is that there is no compiler switch to tell most
of the compilers that these instructions can be used
The IBMers contributing to GCC have been doing pretty well on this
front. GCC 4.1 uses 34 new instructions for z9
On Thu, 26 Apr 2007 09:58:01 -0600, Jeffrey D. Smith
[EMAIL PROTECTED] wrote:
-Original Message-
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
Behalf Of Edward Jaffe
Sent: Thursday, April 26, 2007 9:45 AM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: Latest Principles
Mainframe Discussion List IBM-MAIN@BAMA.UA.EDU
04/26/2007 12:10 PM
Please respond to
IBM Mainframe Discussion List IBM-MAIN@BAMA.UA.EDU
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Subject
Re: Latest Principles of Operation
Speaking of dual pathing.that brings to mind something I could not
remember
most of the time, but still far too
often. You don't let a carpenter into your house if he doesn't know
how to use his tools, do you
re:
http://www.garlic.com/~lynn/2007i.html#25 Latest Principles of Operation
http://www.garlic.com/~lynn/2007i.html#26 Latest Principles of Operation
well, i
On Thu, 26 Apr 2007 15:13:37 -0300, in bit.listserv.ibm-main Clark
Morris [EMAIL PROTECTED] wrote:
On 26 Apr 2007 08:45:03 -0700, [EMAIL PROTECTED] (Edward Jaffe)
wrote:
Clark Morris wrote:
The frustrating thing is that there is no compiler switch to tell most
of the compilers that these
3880-xx Controller series followed by the 3990-xxx series
DASD was 3380-D, 3380-E, 3380-J, 3380-K, 3390-1, 3390-2, 3390-3 (today's
major image) and 3390-9 (a true SLED pulled by crippled and maimed dogs)
Yes, the 3380s had four paths. Do not recall if it was ever increased.
Bob Richards
DASD was 3380-D, 3380-E, 3380-J, 3380-K, 3390-1, 3390-2, 3390-3 (today's major
image) and 3390-9 (a true SLED pulled by crippled and maimed dogs)
You forgot the old 3380-1 (the original).
It had four on a stick and you could have internal path contention.
Yes, the 3380s had four paths. Do not
Hi Tom,
What is MVCOS? (Where did you hear about it?)
Scott
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Scott Blackledge wrote:
What is MVCOS? (Where did you hear about it?)
http://shareew.prod.web.sba.com/client_files/callpapers/attach/SHARE_in_Tampa_Bay/S8162JE123550.pdf
--
Edward E Jaffe
Phoenix Software International, Inc
5200 W Century Blvd, Suite 800
Los Angeles, CA 90045
310-338-0400
: Latest Principles of Operation
Scott Blackledge wrote:
What is MVCOS? (Where did you hear about it?)
http://shareew.prod.web.sba.com/client_files/callpapers/attach/SHARE_in
_Tampa_Bay/S8162JE123550.pdf
--
Edward E Jaffe
Phoenix Software International, Inc
5200 W Century Blvd, Suite 800
John P Baker wrote:
It is disturbing that the MVCOS instruction is not described in the latest
POP.
And, quite surprising.
--
Edward E Jaffe
Phoenix Software International, Inc
5200 W Century Blvd, Suite 800
Los Angeles, CA 90045
310-338-0400 x318
[EMAIL PROTECTED]
Edward Jaffe wrote:
John P Baker wrote:
It is disturbing that the MVCOS instruction is not described in the
latest
POP.
And, quite surprising.
Not really--CSP didn't make it into the POP until some time after the Linux
developers had been using it.
Bob
Bob Rutledge wrote:
Edward Jaffe wrote:
John P Baker wrote:
It is disturbing that the MVCOS instruction is not described in the
latest
POP.
And, quite surprising.
Not really--CSP didn't make it into the POP until some time after the
Linux developers had been using it.
MVCOS has been
On Mon, 23 Apr 2007 14:10:15 -0700, John R. Ehrman wrote:
The new updated to the z/Architecture Principles of Operation is now
available at
http://publibz.boulder.ibm.com/epubs/pdf/a2278325.pdf
With the new instructions, I now count 751 instructions documented in the
POO. That's up a lot
snip-
The new updated to the z/Architecture Principles of Operation is now
available at
http://publibz.boulder.ibm.com/epubs/pdf/a2278325.pdf
With the new instructions, I now count 751 instructions documented in the
POO. That's up a lot
On Wed, 25 Apr 2007 14:16:47 -0500, Rick Fochtman wrote:
With the new instructions, I now count 751 instructions documented in the
POO. That's up a lot from the (IIRC) 143 for S/360.
It's called evolution, son. Like it or not, we're stuck with it and it
can be a good thing, in spite of
-Original Message-
From: IBM Mainframe Discussion List
[mailto:[EMAIL PROTECTED] On Behalf Of Tom Marchant
Sent: Wednesday, April 25, 2007 2:34 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: Latest Principles of Operation
snip
That wasn't a complaint. Actually, I do like it, even
On 25 Apr 2007 12:41:18 -0700, [EMAIL PROTECTED] (McKown, John)
wrote:
Paraphrasing: Having so many instructions will simply confuse the
programmer! Better to have one, true way than many.
http://www.oreillynet.com/onlamp/blog/2007/04/the_virtues_of_monoculture
html
This article is basically
In a message dated 4/25/2007 1:41:31 P.M. Central Daylight Time,
[EMAIL PROTECTED] writes:
With the new instructions, I now count 751 instructions documented in the
POO. That's up a lot from the (IIRC) 143 for S/360.
I do something similar, but less time-consuming. I look at the number
Gee, the POO I use (paper) tops out at around 175 pages...
-Original Message-
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf
Of (IBM Mainframe Discussion List)
Sent: Wednesday, April 25, 2007 4:07 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: Latest Principles
In a message dated 4/25/2007 3:19:22 P.M. Central Daylight Time,
[EMAIL PROTECTED] writes:
Gee, the POO I use (paper) tops out at around 175 pages...
How does it check for floating point decimal?
** See what's free at http://www.aol.com.
Just 'cause it's 37 years out of date is no reason to pick on it...
-Original Message-
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf
Of Ed Finnell
Sent: Wednesday, April 25, 2007 4:24 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: Latest Principles of Operation
The following message is a courtesy copy of an article
that has been posted to bit.listserv.ibm-main,alt.folklore.computers as well.
Howard Brazee [EMAIL PROTECTED] writes:
That makes sense. But continuing that thought, I see Apple, which
doesn't try to make its OS be all things for all
(and hardware
manufacturers).Even if it *is* UNIX.
re:
http://www.garlic.com/~lynn/2007i.html#25 Latest Principles of Operation
apple os (and next before it) starts out with a MACH microkernel basis
... could be considered striving for KISS ... somewhat like the original
CP67
On Mon, 23 Apr 2007 14:10:15 -0700, John R. Ehrman wrote:
The new updated to the z/Architecture Principles of Operation is now
available at
http://publibz.boulder.ibm.com/epubs/pdf/a2278325.pdf
Thanks, John. Will it be available as a BookManager book too?
--
Tom Marchant
The new updated to the z/Architecture Principles of Operation is now
available at
http://publibz.boulder.ibm.com/epubs/pdf/a2278325.pdf
John Ehrman
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Where is bit 27 of STORE FACILITY LIST in figure 4-18? We have a 2094-S18
with it on!
IBM Mainframe Discussion List IBM-MAIN@BAMA.UA.EDU wrote on 04/23/2007
06:13:09 PM:
On Mon, 23 Apr 2007 14:10:15 -0700, John R. Ehrman wrote:
The new updated to the z/Architecture Principles of Operation
Tom Schmidt wrote:
On Mon, 23 Apr 2007 14:10:15 -0700, John R. Ehrman wrote:
The new updated to the z/Architecture Principles of Operation is now
available
...
So where is the MVCOS instruction? (I was expecting to find it in this
update.)
Good point! I haven't gotten around to
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