
Across the Boards
Communications Device Drivers
Section 3 - General Information
Page 14
cfSOFTWARE Confidential,
2000
CICS Terminal Definition
A critical factor in the use of 3270 terminals is the size of the terminal I/O area. This is defined in the TIOAL
parameter in the TCT entry or in the IOAREALEN parameter of the TYPTERM entry if RDO is used to define
terminals.
If the device is non-SNA the value specified should be at least as large as the maximum message that will be
sent to the device. For Model 5 devices, 4000 must be specified.
For SNA devices two parameters are specified, the chain size and the maximum size. The value 256,4000 would
be appropriate for all devices.
We have encountered ATNI abends in cases where too small a TIOAL is specified.
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