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