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Xmodem Definition
DocumentID: 655900
Revision Date: 29-Feb-96 8:29:39 PM

The information in this document applies to:
WordPerfect® 5.1 for DOS

Problem

Solutions: Xmodem: Xmodem is a file transfer protocol. It was the first file transfer protocol to come into widespread use in the microcomputer world. It was developed by veteran computer hacker Ward Christensen in the mid-1970's to transfer files between machines running the CP/M operating system. Until the late 1980's, because of its simplicity and public domain status, Xmodem remained the most widely used microcomputer file transfer protocol. As with virtually all protocols, the file to be transmitted is divided into "blocks"; with Xmodem the blocks are 128-bytes. Each block is sent in sequence, together with a special starting character, an identifying number, and a checksum. The checksum is a number created by adding all of the bytes in the block together. During an Xmodem transfer, the receiving computer is responsible for asking for each block and verifying its correctness. If a block is received correctly, an acknowledgement character is sent in reply.

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