user27245: How/where do I find a complete listing of "acceptable" Marlin g-codes applicable to a Melzi Sanguino board on a 3D printer (Zonestar). It appears that not all printer boards accept all available Marlin codes.

Then I was thinking incorrectly. I had assumed that not all g-codes (from a Marlin build) were, in fact, “implemented” the same way on all boards, and some would not even be recognized or interpreted. But I still don’t understand why that is.

user64075: As already written in the comments the software defines what G-Codes are taken by a (printer) boardBUT Even if the software has the same name (eg Marlin) it might behave different on different boards because of:

different release versions for different hardware
different release repositories being ahead or behind the master repo
hardware specific features a G-code triggers (most unlikely)

The clever way is to go from features I need to software supporting thosefeatures to boards supported AND useable for my hardware to controll (3d-printer/CNC-router/laser-cutter aso) 
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27245: <p>How/where do I find a complete listing of "acceptable" Marlin g-codes applicable to a Melzi Sanguino board on a 3D printer (Zonestar). It appears that not all printer boards accept all available Marlin codes.</p>

<hr>

<p>Then I was thinking incorrectly. I had assumed that not all g-codes (from a Marlin build) were, in fact, “implemented” the same way on all boards, and some would not even be recognized or interpreted. But I still don’t understand why that is.</p>
 64075: <p>As already written in the comments the software defines what G-Codes are taken by a (printer) board<br><strong>BUT</strong> Even if the software has the same name (eg Marlin) it might behave different on different boards because of:</p>

<ul>
<li>different release versions for different hardware</li>
<li>different release repositories being ahead or behind the master repo</li>
<li>hardware specific features a G-code triggers (most unlikely)</li>
</ul>

<p>The clever way is to go from features I need to software supporting thosefeatures to boards supported AND useable for my hardware to controll (3d-printer/CNC-router/laser-cutter aso) 
  - </p>
