After determining that the system
attention interruption by pressing the
The following message asks the user to
supervisor:
is in a wait state, cause an
attention key (or equivalent).
enter the name of the DOS/VS or03A SPECIFY SUPERVISOR NAME
Entering a null line causes DOS/VS to use the default supervisor. $$A$SUP1. Shortly after entering the supervisor name, the system enters the
wait state again. Allow a few seconds to pass to be sure that the wait
state has been reachede Then, cause another attention interruption with
the attention key.
Next, DOS/VS displays a series of messages that display the status
of the IPL procedure, followed by a prompting message: OI10A GIVE IPL CONTROL COMMANDS In response to this message, enter these commands in this order:
1. The ADD or DEL commands to optionally alter the default DOS/VS configuration, which is established at system generation.
2. The SET command (required) to initialize the date and time clock.
3. The CAT command to optionally define the VSAM master catalog.
4. The DPD command (required) to define the page data set.
After entering the DPD command, this message appears: OI201 DOS/VS IPL COMPLETE It signifies that DOSjVS is loade,l into the virtual machine.
If a warm start copy of the SVA (shared virtual area) is available.
this message also appears: 1TOOA WARM START COpy OF SVA FOUND In response, enter KEEP (or a null line) or REJ, depending upon whether this copy of the SVA is to be used.
If no warm start copy of the SVA is available and the
used, create one by using a standard procedure, depending
available in DOS/VS. When the IPL procedure is complete, this message appears:
BG 1IOOA READY FOR COMMUNICATIONS SVA must be
upon what is
It indicates that the background partition is running and is ready to
accept control commands or job control statements.
The ccmplete VM/310 lcgon and DOS/VS IPL procedure as it would appear
on a 3210 terminal is shown in Figure 16. The exclamation marks (!)
indicate pressing the attention key (or its equivalent) a Section 3. DOS/VS in a Virtual Machine 81

logon tester
ENTER PASSWORD: FILES: 001 RDR, NO PRT, NO PUN (see Note 1) LOGON AT 08:19:52 EST MONDAY 01/12/76
set ecmode on
link dosys 250 250 w
(see Note 2) DASD 250 LINKED R/W ipl 250 (see Note 3) OI03A SPECIFY SUPERVISOR NAME $$a$sup2 01041 IPLDEV=X'250',VOLSER=DOSRE3,CPUID=FF0101530155 01301 DATE=01/12/76,CLOCK=16/35/09,ZONE=EAST/04/00 OI10A GIVE IPL CONTROL COMMANDS set (see Note 4)
dpd 01521 PAGE DATA SET EXTENT LOW HIGH
327 0 250 11 01201 DOS/VS IPL COMPLETE BG lIOOA READY FOR COMMUNICATIONS. BG (see Note 5)
log
BG
assgn sysrec,x'250'
BG
set rf=yes
BG
(see Note 6)
BG
// JOB TESTl DATE 10/30/75,CLOCK 16/35/47
BG
1I89A IPL REASON CODE = (see Note 7)
BG lI91A SUB-SYSTEM ID =
BG 11931 RECORDER FILE IS 2% FULL BG 1/ OPTION NODECK (see Note 8)
BG
// EXEC ASSEMBLY BG EOJ TEST1 DATE 10/30/75,CLOCK BG lCOOA ATTN. OOC BG
(see Note 10) BG OP08A INTERV REQ 16/37/49,DURATION (see Note 9) SYSRDR=OOC 00/02/01 ._--_., I I I I Figure 16. IPL DOS/VS and Execute a Job in the Card Reader (Part 1 of 2)
88 IBM VM/370 Operating Systems in a Virtual Machine