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<h4 class="section">PDP-11 Assembly Language Syntax</h4>



   <p><code>as</code> supports both DEC syntax and BSD syntax.  The only

difference is that in DEC syntax, a <code>#</code> character is used to denote

an immediate constants, while in BSD syntax the character for this

purpose is <code>$</code>.



   <p>eneral-purpose registers are named <code>r0</code> through <code>r7</code>. 

Mnemonic alternatives for <code>r6</code> and <code>r7</code> are <code>sp</code> and

<code>pc</code>, respectively.



   <p>Floating-point registers are named <code>ac0</code> through <code>ac3</code>, or

alternatively <code>fr0</code> through <code>fr3</code>.



   <p>Comments are started with a <code>#</code> or a <code>/</code> character, and extend

to the end of the line.  (FIXME: clash with immediates?)



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