Type the block size number in the TPUT buffer block size field.
The TPUT buffer block size can range from 512 - 32767. If defined as 0, ISPF will use it's own calculations to determine the TPUT buffer size. If defined within the range 512 - 32767, ISPF will use the defined value as the buffer block size.
The default is 0.
keyword TPUT_BUFFER_BLOCKSIZE