FUNCTION CONTROL SEQUENCE (PCS) ---------------- OSRRAXXXOTRRXXXB o 78 15 To control the flow of function streams 0 ••• 0 S RR ••• RR
A XXX ••• XXX T
B
1 ••• 1
o
1 00 ••• 00 1 X 1
1
Reserved (must be 1s)
Normal processing Suspend all stream transmission
(wait-a-bit)
Reserved Print stream identifier
Reserved stream identifiers
Console stream identifiers Punch stream identifiers !Qte: Function stream identifiers are meaningful only to the receiver of
the sequence. If bit Ar T, or B is off, transmission is suspended;
transmission continues when all three bits are on.
356 IBM VM/370 System programmer's Guide

Appendix C: VM Monitor Tape Format and
Content time a monitor call interrupt occurs, Monitor receives control and collects data appropriate for the particular class and code
of MONITOR CALL. (Or, for USER, PERFORM, or DASTAP classes, VM/310 Monitor gets control at periodic intervals to collect data.) The data
is formatted into records that are collected sequentially in the order
that each interrupt occurred. The tape data format is standard Variable Blocked (VB) format. Data is written at the default tape drive density.
Maximum block and record lengths are 4096 bytes. The formats and
contents of all the kinds of data records for the currently implemented
classes and codes of MONITOR CALL are listed below. values described in the following records are binary unless
otherwise noted.
'Indicates that the field is EBCDIC.
2Indicates that the field is in special timer format described below.
3See n!2£! 199ic for field format
definition ..
Header Record
Every data record is preceded by the following 12-byte header:
Total bytes in record
Zeros (standard V format record) MONITOR CALL class number MONITOR CALL code number
Tiae of Day
Number DSECT
of Variable 2 MNHRECSZ 2
1 MNHCLASS 2 MNHCODE 5 MNH'IOD Bote: Time of day occupies 2 fullwords in storage, with the rightmost 12 bIts zeros. The rightmost 2 bytes and the left.ost byte are ignored,
giving 16-aicrosecond accuracy instead of 1-microsecond.
The first 4 bytes of this header are the standard variable-format
record field.
Appendix C: VM Monitor Tape Format and Content 351