Portable assembler wanted

[J. Kelly Flanagan]

	I am looking for an assembler that supports all the typical
	macro directives and allows system calls to be made such as
	_printf.  The assembler must be written in C and must have a
	simulation or emulation environment that permits the assembled
	code to be run on a variety of UNIX platforms.  The input
	syntax is not important as long as it is consistent across a
	variety of platforms.

	This assembler is going to be used in a low level
	undergraduate class for which assembly level programming is a
	small part.  From semester to semester they change the
	platform on which this class is taught and it would be nice to
	have a portable assembler who's input syntax did not change
	every 4 months.

	I would like to hear from anyone with suggestions or leads to
	such an assembler.

	kelly at ee.byu.edu
	kelly at remus.ee.byu.edu