X,N,Xmodem
O,N,Xmodem-1k (Old Ymodem)
Y,N,Ymodem (Ymodem-Batch)
Z,N,Zmodem
F,Y,Xmodem-1k-G (Old Ymodem-G)
G,Y,Ymodem-G (Ymodem-G-Batch)