as: VAX-opcodes

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1 9.50.4 VAX Opcodes
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1 All DEC mnemonics are supported.  Beware that 'case...' instructions
1 have exactly 3 operands.  The dispatch table that follows the 'case...'
1 instruction should be made with '.word' statements.  This is compatible
1 with all unix assemblers we know of.
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