XMODEM
Sign in to saveXMODEM is a simple file transfer protocol developed as a quick hack by Ward Christensen for use in his 1977 MODEM.ASM terminal program. It allowed users to transmit files between their computers when both sides used MODEM. Keith Petersen made a minor update to always turn on "quiet mode", and called the result XMODEM.
Key facts
- Networking protocol.title
- XMODEM
- Networking protocol.purpose
- file transfer protocol
- Networking protocol.developer
- Ward Christensen
- Networking protocol.influenced
- YMODEM, many others
- Networking protocol.hardware
- modems
via Wikipedia infobox
~22 min read
Article
20 sectionsContents
- Packet structure
- Transfer details
- Problems
- Minor problems
- Major problems
- Batch transfers
- MODEM7
- TeLink
- XMODEM-CRC
- Higher throughput
- WXModem
- SEAlink
- XMODEM-1K
- NMODEM
- Protocol spoofing
- See also
- References
- Citations
- Bibliography
- External links
XMODEM is a simple file transfer protocol developed as a quick hack by Ward Christensen for use in his 1977 MODEM.ASM terminal program. It allowed users to transmit files between their computers when both sides used MODEM. Keith Petersen made a minor update to always turn on "quiet mode", and called the result XMODEM.
XMODEM, like most file transfer protocols, breaks up the original data into a series of "packets" that are sent to the receiver, along with additional information allowing the receiver to determine whether that packet was correctly received. If an error is detected, the receiver requests that the packet be re-sent. A string of bad packets causes the transfer to abort.