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{{Use American English|date=February 2018}}
{{Use mdy dates|date=December 2022}}
{{Infobox person
The widely adopted [[ZMODEM]] used a [[sliding window protocol]]. Rather than wait for positive acknowledgment after each block is sent, it sent blocks in rapid succession and resent 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.▼
| image = <!-- filename only, no "File:" or "Image:" prefix, and no enclosing [[brackets]] -->
| alt = <!-- descriptive text for use by speech synthesis (text-to-speech) software -->
| caption =
| birth_date = {{birth date|1944|05|06}}
| birth_place = [[Wilmette, Illinois]], US
| death_date = {{Death date and age|2015|09|24|1944|05|06}}
| death_place = [[Portland, Oregon]], US
| other_names = Chuck Forsberg
| occupation =
| years_active = 1968–?
| education = [[M.S.]], [[Electrical engineering]] (1968)<ref name="obit"/>
| alma_mater = [[University of Wisconsin]]
| notable_works = [[YMODEM]], [[ZMODEM]]
| module = {{Infobox engineering career
| discipline = [[Computer engineering]]
| employer = [[Tektronix]]
| significant_projects = [[Tektronix 4010]]
| significant_design =
| significant_advance =
| significant_awards = [[Dvorak Awards|Dvorak Award for Excellence in Telecommunications]]
}}▼
}}
'''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 |accessdate=August 19, 2022}}</ref>) developed two [[data transmission]] protocols popular in the 1990s, for [[upload]]ing and [[download]]ing files from dial-up [[bulletin board system]]s. He received a [[Dvorak Awards|Dvorak Award for Excellence in Telecommunications]] in 1992 for developing [[ZMODEM]].<ref>{{cite web |url=http://www.citivu.com/dvorak/#1992 |title=Dvorak Awards |author=John C. Dvorak |author-link=John C. Dvorak |accessdate=December 8, 2010 |url-status=dead |archiveurl=https://web.archive.org/web/20140306184406/http://www.citivu.com/dvorak/#1992 |archivedate=March 6, 2014 }}</ref> He was also the project engineer on the [[Tektronix 4010]]-series graphics terminals.
▲The widely adopted
Forsberg then wrote a version, Zmodem G, which was for use over "guaranteed error free" communications lines, such as Ethernet or short serial-to-serial computer connections. This protocol waived the usual retransmission overhead, to send files as fast as possible.
Originally, he wrote a program for Unix called rbsb (receive batch / send batch) which used block 0 to transmit a file's name, and optionally date and time, since [[Ward Christensen]] designed [[XMODEM]] to start at block 1, leaving block 0 available. Christensen suggested Forsberg call his protocol [[YMODEM]] because it was "one better" than Xmodem. Forsberg created the program ''YAM'', which in traditional Unix nomenclature stood for ''Yet Another Modem'' after "Modem.asm", the original version of Xmodem released by Christensen in the CP/M User's group in 1977.
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 1989–1990)|Diskette images for Omen Technology's ZComm and DSZ products (circa 1989–1990)]]
[[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
| last = Walker
| first = Jesse
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| title = Rebels on the Air: An Alternative History of Radio in America
| publisher = [[NYU Press]]
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| isbn = 978-0-8147-9381-7
| pages = 199, 305
| url =
}}</ref> He graduated from the academy in 1962.
==References==
{{
{{Authority control}}
▲| NAME = Forsberg, Chuck
▲| SHORT DESCRIPTION = American computer programmer
▲}}
{{DEFAULTSORT:Forsberg, Chuck}}
[[Category:1944 births]]
[[Category:2015 deaths]]
[[Category:Amateur radio people]]
[[Category:American computer programmers]]
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