VAX/UNIX macro assembler wanted

[David C. Martin]

I am in need of a VAX/UNIX macro assembler for instructional use at
UC Berkeley.  It will be used in an introductory machine language/
structures class, so I would be most interested in something that can be 
modified (i.e. source code) to allow for changing needs.

I would even be interested in something commercial (as long as it was
not *too* expensive).

Thanks in advance.

-- 

David C. Martin - Sun Microsystems / UC Berkeley
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