BUFDSECT BOFDSECT is used to transmit buffer control information and tuffer data to and frem programmable remote stations.
The buffer sent across the TP line starts at EUFSTARTi the first 7 bytes of BUFDSECT are used by the DMTSML line driver but are not transmitted. $BUFPOOL in DMTSML points to a queue of available TP buffers; $INBOF in module DMTSML peints to a queue of TP buffers that have been received from a remote station and are
waiting to be deblocked. $OUTBUF in DMTSML points to a queue of TP buffers that are
ready for transmission to remote stations.
Hexadecimal
Displacement
o
o 4 6
7
9
A C o
4
8 C r---------------------------------------------------------, BUFCOUNT BUFSTART Field Name BUFBEGIN DS BOFCHAIN DC BUFCOUNT DS BUFSTAT DS BUFFAKE EQU BUFRESP EQU BUFNAK EQU BUFTEXT BQU BUFOCHEK EQU BUFSTART DS BUFBCB DS BUFFCS DS BUFDATA DS BUFBCB OF A (0) 1H 1C in BUFSTAT i'01'----- X'02' v,nll' A·V .... X'08' X'10' CL2 1C CL2 OF BUFCBAIN BUFSTAT BUFSTART EOFFCS BUFDATA Field Descriptien, Contents, Meaning Beginning of the buffer Buffer chain field
count of bytes to transEit Buffer status byte Dummy buffer indicator
Response only in buffer NlK response being sent Buffer contains text information Unit check expected
Bisynchronous transmission control bytes Block control byte
Function control sequence
Data portion of TP buffer
Section 3. RSCS tata Areas and Contrel Blocks 249

COMDSECT COMDSECT defines address constants used as pointers to subroutines co.mon to all RSCS modules. These subroutines are contained in module DMTCOM. COMDSECT is Fointed to by TCOM in SVECTORS. 0 4
8 C 10 14
Hexadecimal Field
Displacement Na.e o
4
8 C 10 14
GLINKREQ
GPAGEREQ
FPAGEREQ PMSGREQ GMSGREQ GTODEBCD DS 1A DS 1A DS 1A DS 1A DS 1A DS 1A
,
GLINKREQ
GPAGEREQ
FPAGEREQ PMSGREQ GMSGREQ GTODEBCD Field Description, Contents, Meaning Get link tatle entry routine
Get Fage of main storage
Free page of main storage
Put .essage element into message stack
Re.ove message ele.ent fro. .essage stack
convert S/370 TOD to EBCDIC 250 IBM VM/370 Data Areas and Control Block Logic