If it becomes necessary to apply a program Temporary Fix (PTF) to a YM/370 component, refer to the gDQ Generation for detailed information on applying PTFs. Figure 3. -Plgure-4; and Figure 5 summarize the debugging process from identifying the
problem to finding the cause. 14 IEM iM/370 System Programmerls Guide

Page of GC20-1807-7 As Updated April 1, 1981 by TNt GN25-0829 Ii Is there an ABEND condition? II If the message DMKDMP9081 SYSTEM FAILURE, COOE XXX XXX
appears on the console and I the alarm rings,
this is a CP ABEND.
The svstem dumps to disk or to the
printer if the set dump E command
has been issued, and automaticallv performs IPL. • V II If the messages DMKDMP9081 SYSTEM FAILURE, COOE XXXXXX DMKCKP9601 SYSTEM WARMSTART DATA SAVED DMKCKP961W SYSTEM SHUTDOWN COMPLETE
appear on the console,
this is a CP ABEND.
The system dumps to tape !l!' p!inte, .nd stops. - C5J II If the message DMSABNI48T SYSTEM ABEND XXX, CALLE!;) FROM YYYYYY appears on the terminal, this is a CMS ABEND.-C51 II If an ABEND message
from the virtual machine appears
on the terminal, START DEBUGGING ,_,w,_ __________ ...... I. has elapsed II If pressing the REOUEST key on the operator's
console leaves the REOUEST PENDING light on,
a CP disabled wait state exists.
The CPU console light will be on. --- C5J II If the CPU oonscle wait light is on,
the system is in a CP enabled wait state. II If the real PSW problem bit is OFF, f4;l there is a CP loop. ---_ .... II If anv of the following messages . DMKDSP450W CP ENTERED; DISABLED WAIT PSW DMKDSP451W CP ENTERED; INVALID PSW DMKDSP452W CP ENTERED; EXTERNAL INTERRUPT LOOP
DMKPRG453W Ci' ENTERED; PROGRAM INTERRUPT LOOP appears on the terminal,
there i. a disabled wait or an interrupt loop in the
this is an ABEND in the No problem exists
virtual machine. -------__ '\ operating svstem controlling this virtual machine._C5J II Otherwise, an ABEND
condition does not exist, I Fiqure ____________________ 0) 3. fI Unexpected Results? II If an operating system which
executes properly on a real machine
fails to execute properlv under VM/370, there are unexpected results r--"""\ inCP. • l5
A
J II
I! a program which executes under V the control of an operating svstem on
a real machine fails to execute correctly with the same operating svstem under VM/370, there are unexpected results rs;l in the virtual machine. V II
I! the program's output is Inaccurate or miSSIng, there are unexpected results
in the problem program. If the output is redundant r-::'\ check for a loop. - 0 II check for a wait or o Does a Problem Exist? II
I! preSSing the ATTN key once does not cause an mterrupt, V there is a disabled loop in the virtual machine. ) II
I! processing has ceased in the virtual machine without reaching end-of·job, the virtual machine is in an GJ enabled wait state and no 1/0 interrupt has ocwrred. li
lt processing time exceeds normal expectations,
the virtual machine mav have an enabled loop. ) Part 1. Debugging with VM/370 15