r I I I I r-- I DMTREX I I DMTCMX I - - I $PRTN1
RJE:
Process Print
File Records
and Send Them fll to VMJ370. I I $URTNl
RJE:
Process
Punch File ilL- Records and rv- Send Them to VM/370. $TPGET
$JRTNl
I i
Receive Data HOST: from IiSC line
Process Job
via COMSUP; File Records Allocate Tanks L.-.- and Send Them
to Input Processers COMSUP to VM/370. $CRTNl HOST and RJE: Scan RSCS Control Records and
Perform Control Functions.
L SWRTNl RJE: Send Messages
to RSCS Operator Console HOST: Pass Commands ds
to DMTCMX
$RRTNl HOST and RJE: Recerve Records from lit- I't- I II'- j\t-- '\ \
\
\ VM/370 Spool r-- STPPUT I Inl I Receive Tanks
. Via STPPUT. from Output ;::> CMDPROC Send Buffers Execute Local
Commands
Passed by
DMTCMX;Pass
Messages and
Commands to
Remote Stations. I! to SSC line
via COMSUP U I-- Supervisor Routines Control Communi· cations on the SSC line; Send and L Receive: Y • Transmission
\ $START
\\ I \ Contrel Input! Output Pro=rs by Means of
the Commutator Table and Task Control Tables V/ Acknowledgement .1 • Data Streams / , /
Figure 16. Program organization for the SML Line Driver Task RSCS Method of operation and Program Organization 3-37 I /" line

Figure 17.
PUTBLOCK Deblock the
Buffer from
the BSC Line;
Write Data
to VM/370 SP.ool System. MAKEBLOC Get a Block of Data from
the VM/370 Spool System. CMDPROC Process a
Command
Received Over the BSC Line. RECVRFY Obtain Data
Buffers from
the BSC Line.
and Verify
the BSC Control Characters.
GETBLOCK Build a
Buffer for
the Appropriate
Hardware
Device.
Supervisor Routines
NPTGET
Cycle Every
Three Seconds
to Check for: • A Command
to Proces'S • A File to
Transmit • A File to Read SENDVRFY Check SSC Control Characters
After Writing
a Block of
Data to the SSC Line. LlNEIO Read Data
and Write
Data on
the BSC Line. Program Organization for the NPT Line Driver Task
3-38 IBM VM/370: System Logic and Problem Determination--Volume 3 t-----::7 BSC Line