12d43c23___CP_M_Features_and_Facilities_Table_1_4__PIP_Parameters_Meaning
[Parameter] B [Meaning] 
Blocks mode transfer. Data are buffered by PIP until an ASCII x-off character, CTRL-S, is received from the source device. This allows transfer of data to a disk file from a continuous reading device, such as a cassette reader. Upon receipt of the x-off, PIP clears the disk buffers and returns for more input data. The amount of data that can be buffered depends on the memory size of the host system. PIP issues an error message if the buffers overflow.
Section 1: CP/M Features and Facilities
Meaning