Hayes Microcomputer Products, Inc. In: Computerworld. 15. Jahrgang, Nr.17. CW Communications, 27.April 1981, ISSN0010-4841, S.42 (englisch, google.com). The 300 baud auto-dial/auto-answer Smartmodem had a suggested retail price of $279.
Harald Welte:BBSs and early Internet access in the 1990ies.In:media.ccc.de.27.Dezember 2017,abgerufen am 18.Januar 2018(englisch,technologisch-historischer Vortrag am 34C3 (Video, 60Minuten) zum Übergang von POTS-BBS, über Mailbox-Netze zu IP-Netzwerken.).
PatentUS4549302:Modem with improved escape sequence mechanism to prevent escape in response to random occurrence of escape character in transmitted data.Veröffentlichtam11.Oktober 1983,Erfinder:Dale A. Heatherington.
Hayes Microcomputer Products, Inc. In: Computerworld. 15. Jahrgang, Nr.17. CW Communications, 27.April 1981, ISSN0010-4841, S.42 (englisch, google.com). The 300 baud auto-dial/auto-answer Smartmodem had a suggested retail price of $279.