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📁 熟悉非常简单CPU模拟器 1、将所给模拟器的源程序编译成执行程序。 2、运行并观察非常简单CPU模拟器

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      <TITLE>Assembler Directives</TITLE>
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      <H3>Assembler Directives</H3>

      <P>The assembly process can be controlled by assembler directives. The assembler interprets the assembler directives instead of translating them into machine instructions. The assembler supports the following directives:</P>

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               <P><B>Directive</B></P>
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               <P><B>Description</B></P>
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               <P><CODE>ORG&nbsp;&lt;address&gt;</CODE></P>
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               <P>Assemble the subsequent source statements starting at the specified address, <CODE>&lt;address&gt;</CODE>.</P>
               <P><I>Examples:</I></P>
               <BLOCKQUOTE><CODE>ORG 1123H ; Start assembling at address 4387</CODE></BLOCKQUOTE>
               <BLOCKQUOTE><CODE>ORG 567o ; Start assembling at address 375</CODE></BLOCKQUOTE>
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               <P><CODE>DB&nbsp;&lt;number&gt;</CODE></P>
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               <P>Store the specified 1-byte constant <CODE>&lt;number&gt;</CODE> in memory.</P>
               <P><I>Examples:</I></P>
               <BLOCKQUOTE><CODE>DB 11 ; Store the 8-bit constant 11 in memory</CODE></BLOCKQUOTE>
               <BLOCKQUOTE><CODE>DB 333o ; Store the 8-bit constant 219 in memory</CODE></BLOCKQUOTE>
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               <P><CODE>DW&nbsp;&lt;number&gt;</CODE>
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               <P>Store the specified 2-byte constant <CODE>&lt;number&gt;</CODE> in memory.  The assembler initializes the memory with the least significant byte first.</P>
               <P><I>Examples:</I></P>
               <BLOCKQUOTE><CODE>DW 23785 ; Store the 16-bit constant 23785 in memory</CODE></BLOCKQUOTE>
               <BLOCKQUOTE><CODE>DW af43h ; Store the 16-bit constant 44867 in memory</CODE></BLOCKQUOTE>
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<h3><a name="labels"></a>Assembler Labels</h3>
<p>The assembler also supports jump to lables of the form label_name: (notice 
  the : after the label name). The labels are not case censetive.</p>
<p>Example:</p>
<p>JMP MyLabel</p>
<p>....</p>
<p>MyLabel: ....</p>
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