Help for G-Xmodem-1K

This is a small variation of Xmodem that sends blocks that are 1
Kilobyte (1024 bytes) in size. This protocol is still mistakenly
called 'Ymodem-g' by many programs, but people are gradually moving
over to the proper name.

G-Xmodem-1K is meant for error-free channels such as error
correcting modems or null modem cable links between two computers. It
achieves great speed by sending blocks one after another without
waiting for acknowledgment from the receiver. Because of this
however, it can not re-send blocks in case of errors (and thus the
need for an error-free link). If an error is detected by the
receiver, the transfer is aborted.

G-Xmodem-1K is capable of approximately 99-100% of the maximum
theoretical transfer rate.