
help:
https://www.freebasic.net/wiki/wikka.php?wakka=DocToc

downloads
http://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/distributions/1.2/repos/devel/fbc.zip



the files exe mode must be in directory:
http://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/distributions/1.2/repos/util/cwsdpmi.zip




to compile:
fbc file.bas