TSOKEY00 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
1. 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 be repeated.
* A comma must seperate adjacent keywords.
* Invalid or mispelled parameters are ignored and default values are substituted.
Parameter Meaning and Use Valid Range Default Value
USERMAX Specifies the maximum number of users that may be logged 0 to max 40
on to the TSO/VTAM time sharing system at one time. (Note nbr of addr
that because VTAM considers each user to be an application spaces in
program, and because there must be an APPL definition the system
statement that defines each application program to VTAM
during VTAM network definition, this value may not exceed
the number of APPL definition statements.
RECONLIM Specifies the time limit in minutes within which a user may 0 - 32,768 3
reconnect after his line has been disconnected (that is, the
amount of time an address space remains active in the event
of terminal disconnection).
BUFRSIZE Specifies the size in bytes of a VTIOC buffer. Input and 4 - 4092 132
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
HIBFREXT Specifies the maximum amount (in bytes) of virtual storage Maximum size TPUT 48,000
that can be dynamically allocated for output data. When used at the
this value is reached, no more output requests are honored installation
until LOBFREXT is reached. (Input requests are rejected -
only when no virtual storage is available in the address maximum amount
space). of available
LOBFREXT Specifies the minimum number of virtual storage bytes that 0 to 24,000
can be dynamically allocated for output data. When this HIBFREXT-1
value is reached, tasks that are suspended for lack of output
buffers are marked as dispatchable.
CHNLEN Specifies for output the number of request units (RUs) in 1 to 10 4
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
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.
SCRSIZE Specifies the default screen size of IBM 3270 systems network 480 or 1920 480
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
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.
ACBPW Specifies the optional password associated with all TSO/VTAM ACBs. Any 1 to 8 None
If a password is specified on the PRTCT parameter of VTAM's APPL EBCDIC
definition statement, ACBPW must be specified. characters
MODE Specifies how 3276 and 3278 terminals are to be supported for BREAK or NOBREAK
TSO/VTAM. BREAK indicates that the terminal keyboard is unlocked NOBREAK
whenever possible and does not necessarily correspond to the
issuance of a TGET. NOBREAK indicates that the terminal keyboard
is locked except when a TGET is issued. The BREAKIN option of TPUT
applies only when BREAK is specified.
MODESW Specifies whether or not the TERMINAL command or the STBREAK macro YES or NO NO
can be used to change the mode of operation specified with the MODE