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<a name="1218310"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">13.7 Comments</font>
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<p>
<a name="1218311"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">This section is used for listing other information about the instructions that may be of interest. Firstly, there is an indication of the type of the instruction:</font>
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<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1218312"> </a>`Primary instruction' indicates one of the 13 functions which are directly encoded in a single byte instruction,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1218315"> </a>`Secondary instruction' indicates an instruction which is encoded using <strong>opr</strong>.</font></p>
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<a name="1218316"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Then there is information concerning the scheduling of the process.</font>
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<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1218317"> </a>`Instruction is a descheduling point' <br>A process may be descheduled after executing this instruction.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1218319"> </a>`Instruction is a timeslicing point'<br>A process may be timesliced after executing this instruction.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1218321"> </a>`Instruction is interruptible'<br>The execution of this instruction may be interrupted by a high priority process.</font></p>
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<a name="1218323"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">This section also describes any situations where the operation of the instruction is undefined or invalid.</font>
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<a name="1218324"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">For example, using the <strong>add</strong> instruction as an example again, the comments listed are:</font>
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<dl> <dl>
<dt> <a name="1218325"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Secondary instruction.</font>
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<a name="1218326"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">This says that <strong>add</strong> is a secondary instruction.</font>
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