5.
re:
http://www.garlic.com/~lynn/2018.html#77 CKD details
http://www.garlic.com/~lynn/2018.html#79 CKD details
(resend) 2305 was also fixed-head disk (head per track, sort of
replacement for 2301 & 2303 fixed-head drums) ... so there was no arm
movement latency, just rotational delay.
most int
From: IBM Mainframe Discussion List <IBM-MAIN@listserv.ua.edu> on behalf of Ron
hawkins <ronjhawk...@sbcglobal.net>
Sent: Wednesday, January 24, 2018 5:59 PM
To: IBM-MAIN@listserv.ua.edu
Subject: Re: CKD details
Tony,
I am way in over my head here, and I am sure I will u
On 24 January 2018 at 17:59, Ron hawkins wrote:
> Tony,
>
> I am way in over my head here, and I am sure I will use the wrong terminology.
Not to worry. I'm sure I've got things wrong too. And the old memory
isn't what it once was...
> As I remember it RPS was
Subject: Re: [IBM-MAIN] CKD details
On 24 January 2018 at 10:57, Seymour J Metz <sme...@gmu.edu> wrote:
I wrote:
>> What use is Set Sector without a block multiplexor channel (which
>> allows disconnect/reconnect)? Were those available for some S/360
>> models?
> Of
@listserv.ua.edu
Sent: 24-Jan-18 4:55:25 PM
Subject: Re: CKD details
There's certainly no requirement to use Set Sector on any disk drive,
but I question whether the 2860 could handle the data rate of a 2305.
BTW, a company called CIG had a block multiplexor channel that you
could attach to a 360/
From: IBM Mainframe Discussion List <IBM-MAIN@listserv.ua.edu> on behalf of
Tony Harminc <t...@harminc.net>
Sent: Wednesday, January 24, 2018 1:28 PM
To: IBM-MAIN@listserv.ua.edu
Subject: Re: CKD details
On 24 January 2018 at 10:57, Seymour
On 24 January 2018 at 10:57, Seymour J Metz wrote:
I wrote:
>> What use is Set Sector without a block multiplexor channel (which
>> allows disconnect/reconnect)? Were those available for some S/360
>> models?
> Of course they were available; the model number for the 230 should be
5.
re:
http://www.garlic.com/~lynn/2018.html#77 CKD details
http://www.garlic.com/~lynn/2018.html#79 CKD details
2305 was also fixed-head disk (head per track, sort of replacement for
2301 & 2303 fixed-head drums) ... so there was no arm movement latency,
just rotational delay.
most internal s
From: IBM Mainframe Discussion List <IBM-MAIN@listserv.ua.edu> on behalf of
Tony Harminc <t...@harminc.net>
Sent: Tuesday, January 23, 2018 6:37 PM
To: IBM-MAIN@listserv.ua.edu
Subject: Re: CKD details
On 23 January 2018 at 13:56, Seymour J Metz <sme...
On 23 January 2018 at 13:56, Seymour J Metz wrote:
> The 3330 was not the first disk drive with Set Sector; that honor belongs to
> the 2305, formally part of the S/360 series rather than the S/370, although I
> imagine that a lot more were sold for use on, e.g., 370/165, than
5.
re:
http://www.garlic.com/~lynn/2018.html#77 CKD details
http://www.garlic.com/~lynn/2018.html#79 CKD details
2305 was also fixed-head disk (head per track, sort of replacement for
2301 & 2303 fixed-head drums) ... so there was no arm movement latency,
just rotational delay.
most internal s
is now a part of Syncsort.
-Original Message-
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of Seymour J Metz
Sent: Tuesday, January 23, 2018 2:04 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: CKD details
Shirley you mean cells. A single sector might contain
behalf of
Christopher Y. Blaicher <cblaic...@syncsort.com>
Sent: Tuesday, January 23, 2018 9:48 AM
To: IBM-MAIN@listserv.ua.edu
Subject: Re: CKD details
With all I put in the last post, I forgot to answer WHY 20 sectors at a minimum
for a record. It is because at a minimum a record consist
From: IBM Mainframe Discussion List <IBM-MAIN@listserv.ua.edu> on behalf of
Anne & Lynn Wheeler <l...@garlic.com>
Sent: Tuesday, January 23, 2018 12:59 PM
To: IBM-MAIN@listserv.ua.edu
Subject: Re: CKD details
t...@harminc.net (Tony Harm
ust a logical position (degrees, radians, IBM magic
> numbers because degrees and radians were NIH...?) on the track.
re:
http://www.garlic.com/~lynn/2018.html#77 CKD details
it use to be all surfaces were data ... with the 3330, one surface
became dedicated to the sector position ... 20 r/w head
On 23 January 2018 at 10:22, R.S. wrote:
> Fortunately your explanation was clear enough to find out each "mini-record"
> has at least 10 cells (9 control plus a t least one for data).
>
> However you used word "SECTORS". I used "34-byte DATA CELL", following the
W dniu 2018-01-23 o 17:50, Anne & Lynn Wheeler pisze:
cblaic...@syncsort.com (Christopher Y. Blaicher) writes:
Your right, things are a little confusing.
SECTORS - Think of it as 224 pieces of pie. It is, I believe, physical.
CELL - Also physical, but I think of them as little chunks of data,
cblaic...@syncsort.com (Christopher Y. Blaicher) writes:
> Your right, things are a little confusing.
> SECTORS - Think of it as 224 pieces of pie. It is, I believe, physical.
> CELL - Also physical, but I think of them as little chunks of data,
> which may be your data or control data for the
-
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of R.S.
Sent: Tuesday, January 23, 2018 10:22 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: CKD details
Fortunately your explanation was clear enough to find out each "mini-record"
has at least 10 cells
cher
Sent: Tuesday, January 23, 2018 8:30 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: CKD details
See the following for how to calculate a sector
https://www.ibm.com/support/knowledgecenter/en/SSB27H_6.2.0/fa2mr_sectval.html
Question 2: why 20 sectors at a minimum. It's a long answer.
We tend
is now a part of Syncsort.
-Original Message-
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of Christopher Y. Blaicher
Sent: Tuesday, January 23, 2018 8:30 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: CKD details
See the following for how to calculate
@LISTSERV.UA.EDU] On Behalf
Of R.S.
Sent: Tuesday, January 23, 2018 7:15 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: CKD details
Another set of questions:
1. What is sector???
3390 specification says it has 224 sectors per track (3380 had 222 sectors per
track).
I cannot find any explanation
Another set of questions:
1. What is sector???
3390 specification says it has 224 sectors per track (3380 had 222
sectors per track).
I cannot find any explanation for that. Size of data cell is 34 bytes
2. In the 3390 reference I read the record can occupy 20 to 1729 data
cells (excluding
is now a part of Syncsort.
-Original Message-
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of R.S.
Sent: Monday, January 22, 2018 12:34 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: CKD details
W dniu 2018-01-22 o 16:49, Christopher Y. Blaicher pisze
On 22 January 2018 at 09:51, R.S. wrote:
> I'm looking for some reference describing track format of CKD disk.
>
> What I know is
> Index Point - Home Address - R0 - other Rn
>
> Some questions:
> 1. IP is just a "start of track", contains no data - Y/N ?
> 2. What
W dniu 2018-01-22 o 16:49, Christopher Y. Blaicher pisze:
[...]
Extended format data sets use a modified form and here each letter is a nibble:
cccHRRKK Still 8 bytes
[...]
I think you mean EAV, not extended format - is it right?
Regards
--
Radoslaw Skorupka
Lodz, Poland
rillium Software is now a part of Syncsort.
>
> -Original Message-
> From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On
> Behalf Of R.S.
> Sent: Monday, January 22, 2018 9:52 AM
> To: IBM-MAIN@LISTSERV.UA.EDU
> Subject: CKD details
>
> I'm looki
-
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of R.S.
Sent: Monday, January 22, 2018 9:52 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: CKD details
I'm looking for some reference describing track format of CKD disk.
What I know is
Index Point - Home Address - R0
a part of Syncsort.
-Original Message-
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of R.S.
Sent: Monday, January 22, 2018 9:52 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: CKD details
I'm looking for some reference describing track format of CKD disk.
What I
I'm looking for some reference describing track format of CKD disk.
What I know is
Index Point - Home Address - R0 - other Rn
Some questions:
1. IP is just a "start of track", contains no data - Y/N ?
2. What is a format of HA?
3. What is a format of R0?
4. What is a format of Count field? How
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