as: VAX-opcodes

 
 9.49.4 VAX Opcodes
 ------------------
 
 All DEC mnemonics are supported.  Beware that 'case...' instructions
 have exactly 3 operands.  The dispatch table that follows the 'case...'
 instruction should be made with '.word' statements.  This is compatible
 with all unix assemblers we know of.