BUFFOFF specification - Key = '0035'

DALBUFOF specifies the buffer offset. When you code this key, # and LEN must be one, and PARM contains one of the following values:
X'80'
The block prefix is four bytes long and contains the block length (L)
X'nn'
The length of the block prefix (maximum of X'63' (99))
Example: To specify an offset of 16, code:
KEY    #      LEN    PARM
0035   0001   0001   10