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{{Short description|American computer programmer}}
{{Use American English|date=February 2018}}
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{{Infobox person
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'''Charles Alton "Chuck" Forsberg''' (May 6, 1944 – September 24, 2015<ref name="obit">{{cite web|url=https://crowncremationburial.com/tribute/details/2042/Charles-Forsberg/obituary.html#tribute-start |title=Obituary of Charles Alton Forsberg |publisher=Crown Memorial Centers
The widely adopted ZMODEM uses a [[sliding window protocol]]. Rather than wait for positive acknowledgment after each block is sent, it sends blocks in rapid succession and resends unacknowledged blocks later. By avoiding delays due to [[latency (engineering)|latency]], the bandwidth usable for transmission more closely approached the [[bandwidth (computing)|bandwidth]] of the underlying link. ZMODEM could also resume interrupted transfers without retransmitting the already-received blocks. In addition to developing the protocol, Forsberg developed [[software]] for sending and receiving files using ZMODEM.
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Forsberg most recently resided in [[Portland, Oregon]], prior to his death. He ran data transmission software company Omen Technology which he founded in 1984.<ref name="autogenerated1">{{cite web |url=http://www.omen.com/about.html |title=About Omen Technology |accessdate=2012-02-16 |url-status=bot: unknown |archiveurl=https://web.archive.org/web/20150915193210/http://www.omen.com/about.html |archivedate=September 15, 2015 }}</ref> Omen Technology published software tools such as ZComm (a terminal-based communications program that included the ZMODEM-90 file transfer protocol) and DSZ.<ref name="autogenerated">{{cite web | url=https://en.wikipedia.org/wiki/File:OmenTechnology-ZComm-DSZ-SoftwareDisks.jpg|title=Image of software diskettes for ZComm and DSZ, software products published by Omen Software (circa 1990)}}</ref>{{Circular reference|date=July 2021}} He was an [[amateur radio operator]] (call sign WA7KGX)<ref>{{cite web | url = http://wireless2.fcc.gov/UlsApp/UlsSearch/license.jsp?licKey=862831 | title = Amateur License – WA7KGX – FORSBERG, CHARLES A | accessdate = 2012-02-16}}</ref> and a licensed aircraft pilot.<ref name="autogenerated1"/>
[[File:OmenTechnology-ZComm-DSZ-SoftwareDisks.jpg|thumb|right|alt=Diskette images for Omen Technology's ZComm and DSZ products (circa
[[Jesse Walker]] cited Forsberg as a participant in WMAS, a [[pirate radio|pirate radio station]] at [[Western Military Academy]] in [[Alton, Illinois]].<ref>{{cite book
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