operator loads V8/370 r--t 11--------1 1 I II L
Hardware assist status:
CP assist on,
virtual machine assist
on,
expanded virtual machine
assist on.
virtual interval timer
assist on II Class 1 (operator) com­ mands possible before a
virtual machine user is
dispatched. II r --, I These hardware assists are on I after VM/370 is loaded on the I following .achines: Systea/370 Models I 1 35-3 , 1 38 , 14 5-3 , an d 1 4 8 L--- r___ I SET CP1SSIST OFF I SET CP1SSIST ON I SET SlSSIST OFF I SET SlSSIST ON L--- I Operator issues hardware I----------------r----------------------, I assist commands I If no operator hardware
assist commands are
issued, go to part 4 (F) II ..----, I F I L---.J Part 4 Operator issues SET CPASSIST OFF Results:
1
CP assist is eff, I expanded virtual I machine assist is I off, I virtual machine I assist is on I If no more oper­
ator hardware as­
sist com.ands are
issued, go to
part 2 (B) Operator issues SET CPASSIST OR , ,.--I-, I A I L---.I Part 1 Operator issues SET SASSIST OFF r , Results:
CP assist is on,
expanded virtual machine assist is
off,
virtual machine assist is off
virt. intv. timer assist is off
If no more oper­
ator hardware as­
sist commands are
issued, go to
part 3 (D) Operator issues SET SASSIST ON , ,.--I-, I A I L---.I Part 1
Figure 27. Hardware Assist Relationships (Part 1 of 4)
1-412 IBft Vft/370 System Logic and Problem Determination--Volume 1

Part 1 r----1 I B I L---..I II A virtual machine
operator logs on r----1 II I C I Hardware assist status: CP assist off,
virtual machine assist
on,
expanded virtual machine
assist off,
virtual interval timer
assist on II machine operator may issue the following
commands: SET ASSIST OFF SET ASSIST NOTKR SET ASSIST OFF NOTKR i i
Virtual machine operator
issues SET ASSIST OFF II Virtual machine operator
issues SET ASSIST NOTKR L- __________________________ II Virtual machine operator
issues SET ASSIST OFF NOTKR II Results: exp. virt. mach. assist
off,
virt. mach. assist off,
virtual interval timer assist off " L---.J ••• Results:
virt. mach. assist
on,
exp. virt. machine
assist off,
virt. intvl. timer assist off Virtual .achine
operator issues SET ASSIST TKR r--. I C I L---..I Part 2
Virtual machine
operator issues SET ASSIST ON TKR Virtual machine
operator issues SET ASSIST ON i I ,--I-, I C I L---J Part 2 I I .-a-, I E I L---..I Part 2
Figure 27. Hardware Assist Relationships (Part 2 of 4)
Results:
virt. mach. assist
off,
exp. virt. machine assist off,
virt. intvl. timer assist off
Virtual machine operator issues SET ASSIST ON TKR to
turn virt. machine assist on, expanded
virt. mach. assist
off, virt. interval timer assist on
i I r-, I C I L---..I Part 2
Appendix A: VM/370 Extended Control-Program Support 1-413