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<div class="textblock"><p>The following variables are pre-defined by Retro Rocket BASIC and cannot be reassigned:</p>
<ul>
<li>**<code>TRUE</code>** – Always contains the numeric value <code>1</code>. <br  />
 Useful for logical expressions, e.g., <code>IF A = TRUE THEN ...</code>.</li>
<li>**<code>FALSE</code>** – Always contains the numeric value <code>0</code>. <br  />
 Often used as the opposite of <code>TRUE</code>, e.g., <code>IF A = FAL