I have the following manuals w/software on Ebay:
IBM Dos Version 2.1 Manual and Software (#220209849163)
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=220209849163&ssPageName=STRK:MESE:IT&ih=012
IBM PC Asynchronous Communication Sup. Ver 2 1982...