SUB-RECORD CONTROL BYTE (SRCB) To provide snpplemental information about a record The contents of this control block depend upon the
record type. Several types are shown below • • ,.CHAR •• o 1 To identify the type of generalized control record !!i1§: CHARACTER
OMCCCCCC
o 1
A
B
C
D
E
F
G
H
I-R
s-z
Initial terminal sign-on
Final terminal sign-off
Print initialization record
Punch initialization record
Input initialization record
Data set transmission
initialization
System configuration status
Diagnostic control record
Reserved
Available to user To provide carriage control information for print records
CCCCCC
1
o
1 000000 OOOONN 01NNNN 1000NN 11NNNN Normal carriage control
Reserved
Suppress space
Space nn lines after print
Skip to channel nnnn after print
Space immediate nn spaces
Skip immediate to channel nnnn
Appendix B: MULTI-LEAVING 353

OMMBRRSS o 7- To provide additional information for punch records o MM B
RR SS ------- OMMBRRRR o 7
1 00 01 10 11
o
1 00 NN SCB count units = 1 SCB count units = 2 SCB count units = 4 Reserved
EBCDIC card i.age
Column binary card image Reserved
Stacker select information Q§gg§: To provide additional information for input records o MM B
RRRR
------- OTTTTTTT o 7
1 00 01 10 11 0 1 0000 SCB count units = 1 SCB count units = 2 SCB count units = 4 Reserved
EBCDIC card image
Column binary image Reserved To indicate the destination of a terminal message !!i1§: o
TTTTTTT
1 0000000 NNNBNNN Broadcase to all remote systems Remote system number (1-99) or
remote system group (100-127) 354 IBM VM/370 System programmer's Guide