APRSdos
From APRSWiki
APRSdos is Bob Bruninga's original APRS program for MS-DOS. It is available from Bob's home page at http://www.ew.usna.edu/~bruninga/aprs.html and through the Tucson Amateur Packet Radio web site at ftp://ftp.tapr.org/aprssig/dosstuff/APRSdos