Chuck Forsberg's fame comes in part from developing the YMODEM and ZMODEM file transfer protocols. ZMODEM is a file transfer protocol with error checking and crash recovery. ZMODEM does not wait for positive acknowledgment after each block is sent, but rather sends blocks in rapid succession. If a ZMODEM transfer is cancelled or interrupted for any reason, the transfer can be resurrected later and the previously transferred information need not be resent.
Chuck Forsberg designed YMODEM as a file transfer protocol for use between modems and developed it as the successor to XMODEM and MODEM7, It was formally given the name "YMODEM" (Yet another Modem implementation) in 1985 by Ward Christensen.
Other biographical information
Chuck Forsberg graduated from Western Military Academy in 1962. Forsberg founded the company Omen Technology, which specializes in data transfer software, in 1984. He is an amateur radio operator (call sign WA7KGX), and a licensed aircraft pilot. He currently resides in Portland, Oregon.
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