VTIOC parameters that are used by TSO/VTAM time sharing.
USERMAX=8, /* MAXIMUM USERS */
RECONLIM=60, /* MAXIMUM DISCONNECT MINUTES */
BUFRSIZE=132, /* VTIOC BUFFER SIZE */
HIBFREXT=13200, /* MAX BUFFERS BEFORE SWAP OUT */
LOBFREXT=6600, /* MIMIMUM BUFFERS BEFORE SWAP IN */
MODE=NOBREAK, /* KEYBOARD LOCK OPTION */
MODESW=NO, /* MODESWITCH FROM TERMINAL OPTION */
CHNLEN=4, /* NO. OF RU'S PER CHAIN */
SCRSIZE=1920 /* MAXIMUM SCREEN SIZE */
Parameter in IEASYSxx
TSOKEY00 or an alternate
member name may be specified by using the MEMBER operand or the
keyword operand (overriding MBR) of the operator START command, or
by coding it into the PARMLIB DD statement of the cataloged
procedure evoked by the START command.
For each record, columns
1 through 71 are valid for data.
Data may be continued
from one record to another by ending a record with a command and
blank in contiguous data columns, then inserting data in any column
of the data area on the next record.
A parameter must be
complete in a record, it may not cross record boundaries, it may not
A comma must seperate
Invalid or mispelled
parameters are ignored and default values are substituted.
||Meaning and Use
||Specifies the maximum number of users that may be
logged on to the TSO/VTAM time sharing system at one time.
(Note that because VTAM considers each user to be an application
program, and because there must be an APPL definition statement
that defines each application program to VTAM during VTAM network
definition, this value may not exceed the number of APPL
||0 - maximum number of address spaces in the system
||Specifies the time limit in minutes within which a
user may reconnect after his line has been disconnected (that is,
the amount of time an address space remains active in the event of
||0 - 32,768
||Specifies the size in bytes of a VTIOC
buffer. Input and output data smaller than the BUFRSIZE
value uses cells equal to the BUFRSIZE value. Input and
output data larger than the BUFRSIZE value is assigned to
dynamically allocated buffers (allocated by the GETMAIN macro)
equal to the data size.
||4 - 4092
||Specifies the maximum amount (in bytes) of virtual
storage that can be dynamically allocated for output data. When
this value is reached, no more output requests are honored until
LOBFREXT is reached. (Input requests are rejected only when
no virtual storage is available in the address space).
||Maximum size TPUT used at the installation -
maximum amount of svilable virtual storage
||Specifies the minimum number of virtual storage
bytes that can be dynamically allocated for output data.
When this value is reached, tasks that are suspended for lack of
output buffers are marked as dispatchable.
||0 - HIBFREXT-1
||Specifies for output the number of request units (RUs)
in each RU chain for IBM 3767 and IBM 3770 terminals. This
value determines the maximum size of a chain and, therefore, the
maximum amount of data that can be sent to the terminal in one
chain (CHNLEN x 256 = data transmitted). This value also
determines the maximum amount of data purged when the CANCEL key
is pressed to stop printing of outbound (host-to-terminal) data.
The CHNLEN value is associated with the values specified on the
PACING operand of the LU macro during network control program
definition, and on the VPACING operand of the LU or PU macro
during VTAM definition. Use the CHNLEN default value (4) if
the PACING and VPACING default values are used. Otherwise,
calculate CHNLEN by using the formula (2pn-2pm)+(2vn-2vm), where
pn and pm are the PACING n and m values, and vn and vm are the
VPACING values. If more than one network control program is
used with TSO/VTAM time sharing, the smallest value found when
calculating the CHNLEN value should be used. Otherwise, the
network control program could enter slowdown mode.
|1 - 10
||Specifies the default screen size of IBM 3270
systems network architecture (SNA) terminals: either 480
characters or 1920 characters. (Use FEATUR2 operand of the
LOCAL TERMINAL macros to specify non-SNA IBM 3270 screen
sizes.) This value affects only those terminals whose sizes
were not specified by using the PSERVIC parameter of teh MODEENT
macro during VTAM definition.
If an installation has IBM 3270 SNA terminals of only one
screen size, SCRSIZE should specify that size. If the
installation has IBM 3270 SNA terminals of both screen sizes,
SCRSIZE may be used to define the more common size, and the
PSERVIC parameter may be used to define the less common size.
|480 or 1920
||Specifies the optional password associated with all
TSO/VTAM ACBs. If a password is specified on the PRTCT
parameter of VTAM's APPL definition statement, ACBPW must be
||Any 1 to 8 EBCDIC characters
||Specifies how 3276 and 3278 terminals are to be
supported for TSO/VTAM. BREAK indicates that the terminal
keyboard is unlocked whenever possible and does not necessarily correspond
to the issuance of a TGET. NOBREAK indicates that the
terminal keyboard is loked except when a TGET is issued. The
BREAKIN option of TPUT applies only when BREAK is specified.
||BREAK or NOBREAK
||Specifies whether or not the TERMINAL command or
the STBREAK macro can be used to change the mode of operation
specified with the MODE parameter.
||YES or NO