XMODEM became extremely popular in the early bulletin board system (BBS) market, largely because it was simple to implement. A string of bad packets causes the transfer to abort.
If an error is detected, the receiver requests that the packet be re-sent. 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. Keith Petersen made a minor update to always turn on 'quiet mode', and called the result XMODEM. It allowed users to transmit files between their computers when both sides used MODEM. XMODEM is a simple file transfer protocol developed as a quick hack by Ward Christensen for use in his 1977 MODEM.ASM terminal program. ( January 2009) ( Learn how and when to remove this template message) Please help to improve this article by introducing more precise citations. This article includes a list of general references, but it lacks sufficient corresponding inline citations.
