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sandeep chopra
New User
Joined: 28 Aug 2008
Posts: 11
Location: Noida
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We can access DCB when following combinations of RMODE and AMODE.
AMODE 24 and RMODE 24
AMODE 31 and RMODE 24
But we cann't access DCB when we give AMODE 31 and RMODE ANY.
I know in this case we need to take storage below the line through GETMAIN and we have to move our DCB in that storage. Initially this was the limitation for AMODE 31 also but which was resolved by the IBM.
But after searching in google i did not find a good answer why we can not access DCB when RMODE ANY or RMODE 31? |
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dick scherrer
Moderator Emeritus
Joined: 23 Nov 2006
Posts: 19244
Location: Inside the Matrix
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Hello,
It may help if you post the code for the problem dcb. |
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sandeep chopra
New User
Joined: 28 Aug 2008
Posts: 11
Location: Noida
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Hi Dick,
Thanks for your comments. I think no need to post code.It's a general concept in assembler which i want to clear. Whenever we try to access DCB in any assembler program having AMODE 31 and RMODE 31, we get S0C4. |
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Robert Sample
Global Moderator
Joined: 06 Jun 2008
Posts: 8696
Location: Dubuque, Iowa, USA
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Figure 83 in the DF/SMS Using Datasets manual has reentrant code opening a DCB with AMODE 31 and RMODE ANY -- so it can be done, and your statement
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| But we cann't access DCB when we give AMODE 31 and RMODE ANY. |
has something to do with your site and its standards -- not the Assembler. |
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Bill O'Boyle
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Joined: 14 Jan 2008
Posts: 2501
Location: Atlanta, Georgia, USA
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You can assemble the program as AMODE 31, RMODE ANY, however, you'd have to obtain 24-Bit dynamic storage (GETMAIN, STORAGE OBTAIN) for the DCB.
The JFCB's address is an AL3 (max address X'007FFFFF') so, this is why 31-Bit addressing will cause a S0C4.
You may want to review DCBE. 
Bill |
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enrico-sorichetti
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Joined: 14 Mar 2007
Posts: 10873
Location: italy
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sandeep chopra
New User
Joined: 28 Aug 2008
Posts: 11
Location: Noida
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Thanks for reply Bill.
Yes we take dynamic storage below the line to access DCB for this case. But how can this below the line dynamic storage is accessed but not of DCB directly without moving DCb in dynamic storage. |
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UmeySan
Active Member
Joined: 22 Aug 2006
Posts: 771
Location: Germany
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Morning Sir !
As told before, use DCBE.
Programm-Definitions:
Filename = S3MSGS
S3MSGS_DCB DCB
DDNAME=S3MSG,DSORG=PS,MACRF=PM,DCBE=S3MSGS_DCBE
S3MSGS_DCBE DCBE RMODE31=BUFF
Xample-Coding:
USING IHADCB,R4
L R4,=A(S3MSGS_DCB)
IF DCBOFLGS,Z,DCBOFOPN,TM
THEN C='Dataset is not open'
OPEN ((R4),OUTPUT)
EIF |
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PeterHolland
Global Moderator
Joined: 27 Oct 2009
Posts: 2481
Location: Netherlands, Amstelveen
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S3MSGS_DCB
S3MSGS_DCBE
Always thought a label has a max of 8 characters. |
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Robert Sample
Global Moderator
Joined: 06 Jun 2008
Posts: 8696
Location: Dubuque, Iowa, USA
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| Peter, Assembler is slowly catching up ... labels can be 31 characters now (IIRC). |
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PeterHolland
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Joined: 27 Oct 2009
Posts: 2481
Location: Netherlands, Amstelveen
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| Robert Sample wrote: |
| Peter, Assembler is slowly catching up ... labels can be 31 characters now (IIRC). |
Robert,
if thats true, then it is me being stuck in the dark ages. 
And :
pics, movies or it didnt happen.  |
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Robert Sample
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Location: Dubuque, Iowa, USA
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From the HLASM General Information manual:
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3.5.7 Symbol Length
High Level Assembler supports three types of symbols:
Ordinary symbols
The format of an ordinary symbol consists of an alphabetic character, followed by a maximum of 62 alphanumeric characters.
Variable symbols
The format of a variable symbol consists of an ampersand (&) followed by an alphabetic character, followed by a maximum of 61 alphanumeric characters.
Sequence symbols
The format of a sequence symbol consists of a period (.) followed by an alphabetic character, followed by a maximum of 61 alphanumeric characters.
External symbols are ordinary symbols used in the name field of START, CSECT, RSECT, COM, DXD, and ALIAS statements, and in the operand field of ENTRY, EXTRN, WXTRN, and ALIAS statements. Symbols used in V-type and Q-type address constants are restricted to 8 characters. You can specify an alias string of up to 64 characters to represent an external symbol. |
I was wrong -- 63 is the limit. |
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PeterHolland
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Joined: 27 Oct 2009
Posts: 2481
Location: Netherlands, Amstelveen
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Robert,
thanks a lot. |
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Bill O'Boyle
CICS Moderator
Joined: 14 Jan 2008
Posts: 2501
Location: Atlanta, Georgia, USA
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| PeterHolland wrote: |
S3MSGS_DCB
S3MSGS_DCBE
Always thought a label has a max of 8 characters. |
Peter,
I have a tough time defining labels greater than eight positions (almost have to force myself), but even IBM DSECTS, Macros, etc, have them, so I go with the flow.
No longer are positions, 10 and 16 enforced either as HLASM has taken on a "Free Flow" format.
HLASM has also incorporated a Macro-Option, which allows (for example), an IF/THE/ELSE construct, cloaking Assembler as some sort of low-level HLL.
UmeySan demonstrated this in his above post.
It takes some time to get used to these nuances....
Bill |
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PeterHolland
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Joined: 27 Oct 2009
Posts: 2481
Location: Netherlands, Amstelveen
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Bill,
thanks.
All this new stuff makes it terrible difficult for an old hand like me. I think
all the wizzkids on this forum can handle all those novelties better than me.  |
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UmeySan
Active Member
Joined: 22 Aug 2006
Posts: 771
Location: Germany
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Good evening, ladies!
If-constructs and other macros like this had been primordial develloped by IBM. I first came in contact with this in 1980.
Now some shops maintain these macros broaden the range.
But the origin was startet by IBM. |
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PeterHolland
Global Moderator
Joined: 27 Oct 2009
Posts: 2481
Location: Netherlands, Amstelveen
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Good evening, ladies!
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Try to find some IT work where guys are not ladies. |
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Akatsukami
Global Moderator
Joined: 03 Oct 2009
Posts: 1788
Location: Bloomington, IL
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| PeterHolland wrote: |
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Good evening, ladies!
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Try to find some IT work where guys are not ladies. |
The hard part is finding work where the ladies are not guys |
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dbzTHEdinosauer
Global Moderator
Joined: 20 Oct 2006
Posts: 6966
Location: porcelain throne
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| i personally like aggressive women. |
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UmeySan
Active Member
Joined: 22 Aug 2006
Posts: 771
Location: Germany
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Morning gentlemen !
First: @All
"Morning ladies" is a comon phrase within the military jargon.
Second: @Peter
Wizzkids !? -> If you are older than 55, older then me, and an higher ranking officer, then ok, it's on me to clean your shoes and to serve you a drink, otherwise ...
Third: @Dick
I really aggree!!! Just reminds me of this fantastic little busty blond saucy fox, having a fine time on a controller unit during nightshift. But as you already know about me, all blonds have gone, just the good old red wine is still here with me, sitting in my private litte dark and binary universe, thinkink gloomy thoughts and remembering all these good old days. :-))
@ All again:
I won't lett you die a wretched death. There are a lot of new fantastic
enhancements in the Assembler-Language. For example the Cobol Search/String/Unstring pendants SRST & MVST.
Plse forgive my churlishness & let god spend us all a lazy long weekend.
And personaly i thank god, for the possibility to spread my wisdoms during my worktime for a customer and get payed for it. I really love my job.
Nice weekend ! |
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