The YMODEM Driver is self-configuring. It supports 128, 1024 and 4096 byte packets, checksum and CRC-16 error detection, full streaming and single and batch transfer modes.

When receiving, it is identical to the YMODEM and YMODEM-g Drivers except that it requests CRC-16 error detection (by send a C). When sending, it sends any number of files using the YMODEM protocol and uses whatever options are specified by the receiver.