RIP: Ward Christensen, co-developer of the CBSS
Briefly

Ward Christensen and Randy Suess developed the Computerized Bulletin Board System (CBBS) in 1978, the first public dial-up BBS, revolutionizing data exchange for computer hobbyists.
Christensen's XMODEM file transfer protocol, created in 1977, simplified file transmission between computers, breaking data into packets and allowing for error resends, becoming a BBS staple.
Read at Theregister
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