Diagnose A8

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Article #1066

#1066

From: Rich Greenberg
Date: Wed, 23 Mar 1994 16:47

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Usage of DIAGNOSE A8,  general i/o.                                          
                                                                             
I just converted one of my utilities that had been using DIAG 20             
i/o so that it would work in XA mode.  One of the conversions was            
to change DIAG 20 to DIAG A8.  The control block for DIAG A8 needs            
the storage key of the buffer.  What I did was:                              
                                                                             
           LA     R5,BUFFER                                                  
           ISKE   R2,R5                                                      
           N      R2,=A(X'00F0')                                             
           STC    R2,SGIOKEY                                                 
                                                                             
What I am asking is:  Is this the best way to do it?  While looking up       
ISKE in the POPs (Its not one I use every day) I also saw ISKV.  I am not    
sure if this is the instruction I should have used in the more general case. 
Or is there a better scheme that I missed?                                   
                                                                             
Does anyone know how far back DIAG A8 goes?  I tested the NUCON bit which    
says that DIAG A8 is available (same byte that says if in XA mode) and       
dual pathed that part of my code back to DIAG 20.  Should I have bothered?   
-- 
Rich Greenberg            Work: ETi Solutions, Oceanside & L.A. CA 310-348-7677
N6LRT   TinselTown, USA   Play: richgr@netcom.com                  310-649-0238
Pacific time.  I speak for myself and my dogs only.  Canines: Chinook & Husky

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From: richgr@netcom.com (Rich Greenberg)
Subject: Diagnose A8
Message-ID: <richgrCn4Mnz.KuE@netcom.com>
Organization: NETCOM On-line Communication Services (408 241-9760 guest)
Date: Wed, 23 Mar 1994 16:47:59 GMT
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