Novaterm 9.6 User's Guide
Therefore, it is only suitable for downloading over modem
connections with error correction, or across a null modem connection
with another computer.
Ymodem-g holds the prize for being the fastest of the protocols, since
there is no overhead in waiting for acknowledgments from the
receiving computer. However, the lack of error recovery makes it
impractical except over a modem link with error correction.
3.4.3.4 Xmodem-1k
This is an extension of the original Xmodem protocol that uses 1024-
byte blocks. It can only transfer a single file at a time. Unlike
Zmodem and Ymodem, both the receiver and sender must supply a
file name, as the protocol will not transfer the name with the data.
This protocol also has the "file padding" problem described above.
3.4.3.5 Xmodem 1k-g
Xmodem-1k-g is a streaming-mode extension of Ymodem. Like
Ymodem-g, you must upload or download directly to the buffer, and
the transfer aborts at the first sign of an error. It is extremely fast, but
must be used over a link with error correction.
3.4.3.6 Xmodem-CRC
This is the original Xmodem protocol. It supports both CRC
checksums and additive checksums, so you may use this protocol even
it the receiver does not support a CRC version of Xmodem. It
transfers data in 128-byte blocks; file names are not transferred; and
"file padding" does occur.
3.4.3.7 Punter (C1)
The Punter protocol (also called "C1") was originally designed for use
on Commodore computers, although it has fallen out of use in recent
years. The Punter protocol can only transfer a single file at a time, but
it does not suffer from "file padding". It uses up to 255-byte blocks
to transfer data. You're likely to find it only on Commodore-based
bulletin board systems.
3.4.3.8 Multi-Punter
Punter multi-transfer is an extension to Punter that supports batch file
transfers. It is available on a few Commodore-based bulletin board
systems.