while reading files, or invalid data. The procedure is the
checkpoint start except that unreadable or invalid files are bypassed.
CP
terainal,
execution can be stopped at any
1
s attention
restarted by entering the appropriate CP
and device ready interrupts can be siaulated on the virtual aachine.
Virtual storage and virtual machine registers can be inspected and
.odified, as can status words such as the
trace facilities are provided
single-instruction
and disk sharing functions of CP.
CP com.ands are classified
The classes are
operator (class B),
(class D),
used to inspect real storage locations, but
real resource control capabilities.
all coamands related to virtual aachine performance options, such as
assigning a set of reserved page frames to a selected virtual aachine.