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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> 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"/>
[[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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