The Netwide Assembler v0.98bf
"NASM is the Netwide Assembler, a free portable assembler for the Intel 80x86 microprocessor series, which uses the traditional Intel instruction mnemonics and syntax. "
Binary:
http://hobbes.nmsu.edu/cgi-bin/h-search?key=nasm-0.98bf-emx.zip
Docs:
http://hobbes.nmsu.edu/cgi-bin/h-search?key=nasm-0.98-doc.zip
Source: OS2VOICE