297 lines
14 KiB
HTML
297 lines
14 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html>
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<head>
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<title>AppleWin Debugger Tutorial</title>
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<meta http-equiv="CONTENT-TYPE" content="text/html; charset=windows-1252">
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</head>
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<body style="DIRECTION: ltr" lang="en-US">
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<h2><a name="Registers1"></a>Registers</h2>
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<p>The command line now recognizes 6502 Registers. Namely,
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</p>
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<ul>
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<li>
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<p><b>A</b>, the Accumulator,</p>
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<li>
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<p style="MARGIN-BOTTOM: 0in"><b>X</b>, the 1<sup>st</sup> Index Register,</p>
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<li>
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<p style="MARGIN-BOTTOM: 0in"><b>Y</b>, the 2<sup>nd</sup> Index Register,</p>
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<li>
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<p style="MARGIN-BOTTOM: 0in"><b>PC</b>, the Program Counter,
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</p>
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<li>
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<p style="MARGIN-BOTTOM: 0in"><b>S</b>, the Stack Pointer, and
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</p>
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<li>
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<p><b>P</b>, the Processor Status Register (Flags).</p>
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</li>
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</ul>
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<p>You can set a Register to a hex Value, Symbol, or Expression. (See the
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section <a href="#Calculator">Calculator</a> for more examples of using
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expressions.) The syntax is:</p>
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<br>
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<table bgcolor="#e6e6e6" border="0" cellpadding="2" cellspacing="0" width="75%">
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<COLGROUP>
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<col width="64">
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<col width="192">
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<tbody>
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<tr bgcolor="#000000">
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<td bgcolor="#000000" width="25%">
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<p><font color="#ffffff"><b>Command</b></font></p>
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</td>
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<td bgcolor="#000000" width="75%">
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<p style="FONT-STYLE: normal"><font color="#ffffff"><b>Effect</b></font></p>
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</td>
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</tr>
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<tr bgcolor="#cccccc">
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<td width="25%">
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<p><font color="#000000"><font face="Courier"><b><span style="BACKGROUND: 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">R
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r [=] ####</span></b></font></font></p>
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</td>
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<td width="75%">
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<p><i><span style="BACKGROUND: 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">Set
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Register to (a byte) Value, Symbol, or Address, or Expression.</span></i></p>
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</td>
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</tr>
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<tr bgcolor="#999999">
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<td width="25%">
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<p><font color="#000000"><font face="Courier"><b><span style="BACKGROUND: 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">R
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A ##</span></b></font></font></p>
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</td>
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<td width="75%">
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<p><i><span style="BACKGROUND: 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">Set
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Accumulator to (a byte) Value</span></i></p>
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</td>
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</tr>
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<tr bgcolor="#cccccc">
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<td width="25%">
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<p><font color="#000000"><font face="Courier"><b><span style="BACKGROUND: 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">R
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X ##</span></b></font></font></p>
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</td>
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<td width="75%">
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<p><i><span style="BACKGROUND: 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">Set
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Register X to (a byte) Value</span></i></p>
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</td>
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</tr>
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<tr bgcolor="#999999">
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<td width="25%">
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<p><font color="#000000"><font face="Courier"><b><span style="BACKGROUND: 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">R
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Y ##</span></b></font></font></p>
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</td>
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<td width="75%">
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<p><i><span style="BACKGROUND: 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">Set
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Register Y to (a byte) Value</span></i></p>
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</td>
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</tr>
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<tr bgcolor="#cccccc">
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<td width="25%">
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<p><font color="#000000"><font face="Courier"><b><span style="BACKGROUND: 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">R
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PC ####</span></b></font></font></p>
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</td>
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<td width="75%">
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<p><i><span style="BACKGROUND: 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">Set
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PC to (a full 16-bit) Address (Value)</span></i></p>
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</td>
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</tr>
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<tr bgcolor="#999999">
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<td width="25%">
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<p><font color="#000000"><font face="Courier"><b><span style="BACKGROUND: 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">R
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S ##</span></b></font></font></p>
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</td>
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<td width="75%">
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<p><i><span style="BACKGROUND: 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">Set
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Stack Register to (an 8-Bit) Offset</span></i></p>
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</td>
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</tr>
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<tr bgcolor="#cccccc">
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<td width="25%">
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<p><font color="#000000"><font face="Courier"><b><span style="BACKGROUND: 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">R
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P ##</span></b></font></font></p>
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</td>
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<td width="75%">
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<p><i><span style="BACKGROUND: 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">Set
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Processor Status Register (flags) to (a byte) Value</span></i></p>
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</td>
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</tr>
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</tbody>
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</table>
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<p><br>
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<br>
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</p>
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<p><b>Notes</b>:</p>
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<ul>
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<li>
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<p style="MARGIN-BOTTOM: 0in"><i>Since <b>A</b> refers to the Accumulator, you need to
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prefix the hex number <b>A</b> with either:<br>
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i) a zero '<b>0</b>', or<br>
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ii) the hash '<b>#</b>' symbol (same as 6502 immediate
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symbol.)</i></p>
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</li>
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</ul>
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<ul>
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<li>
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<p><i>You can prefix a symbol with the dollar sign '<b>$</b>' to tell the parser it is
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a symbol Address instead of a Value.</i></p>
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<li>
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<p><i>If a symbol is not defined, the expression will be the corresponding hex Value,
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if possible.</i></p>
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<li>
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<p><i>Hex Values may be ambiguous, if their corresponding symbol is defined. To
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avoid confusion, don<6F>t define symbols such as the popular $DEAD, $BEEF, $C0DE,
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$CAFE, etc. An example is given with A1.</i></p>
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</li>
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</ul>
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<br>
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<p><font size="4"><b>Examples</b>:</font></p>
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<table bgcolor="#000000" border="0" cellpadding="2" cellspacing="0" width="90%">
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<COLGROUP>
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<col width="64">
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<col width="192">
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<tbody>
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<tr bgcolor="#00b8ff">
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<td bgcolor="#30c0ff" width="25%">
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<p><font color="#000000"><b>Input</b></font></p>
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</td>
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<td bgcolor="#30c0ff" width="75%">
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<p><font color="#000000"><b>Effect</b></font></p>
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</td>
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</tr>
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<tr bgcolor="#000000">
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<td width="25%">
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<p><font color="#00b8ff"><font face="Courier"><b>R PC FA62 </b></font></font>
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</p>
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</td>
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<td width="75%">
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<p><font color="#ffffff"><i>Set Program Counter to Value $<b><font color="#ffff00">FA62</font></b>
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(RESET) </i></font>
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</p>
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</td>
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</tr>
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<tr bgcolor="#000000">
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<td bgcolor="#000000" width="25%">
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<p><font color="#00b8ff"><font face="Courier"><b><span style="BACKGROUND: rgb(0,0,0) 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">R
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PC RESET + 1</span></b></font></font></p>
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</td>
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<td bgcolor="#000000" width="75%">
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<p><font color="#ffffff"><i>Set Program Counter to Address $<b><font color="#ffff00">FA63</font></b>
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(RESET+1)</i></font></p>
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</td>
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</tr>
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<tr bgcolor="#000000">
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<td bgcolor="#000000" width="25%">
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<p><font color="#00b8ff"><font face="Courier"><b><span style="BACKGROUND: rgb(0,0,0) 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">R
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X 2 </span></b></font></font>
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</p>
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</td>
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<td bgcolor="#000000" width="75%">
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<p><font color="#ffffff"><i>Set Register to Value <font style="FONT-WEIGHT: bold" color="#ffff00">
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2</font></i></font></p>
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</td>
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</tr>
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<tr bgcolor="#000000">
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<td bgcolor="#000000" width="25%">
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<p><font color="#00b8ff"><font face="Courier"><b><span style="BACKGROUND: rgb(0,0,0) 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">R
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Y 3 </span></b></font></font>
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</p>
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</td>
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<td bgcolor="#000000" width="75%">
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<p><font color="#ffffff"><i>Set Register to Value <font style="FONT-WEIGHT: bold" color="#ffff00">
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3</font></i></font></p>
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</td>
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</tr>
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<tr bgcolor="#000000">
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<td bgcolor="#000000" width="25%">
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<p><font color="#00b8ff"><font face="Courier"><b><span style="BACKGROUND: rgb(0,0,0) 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">R
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S 1FE </span></b></font></font>
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</p>
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</td>
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<td bgcolor="#000000" width="75%">
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<p><font color="#ffffff"><i>Set Stack Pointer to depth of one (Stack grows down from $01FF)</i></font></p>
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</td>
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</tr>
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<tr bgcolor="#000000">
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<td bgcolor="#000000" width="25%">
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<p><font color="#00b8ff"><font face="Courier"><b><span style="BACKGROUND: rgb(0,0,0) 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">R
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S FF </span></b></font></font>
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</p>
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</td>
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<td bgcolor="#000000" width="75%">
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<p><font color="#ffffff"><i>Set Stack Pointer to top of stack (Empty)</i></font></p>
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</td>
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</tr>
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<tr bgcolor="#000000">
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<td bgcolor="#000000" width="25%">
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<p><font color="#00b8ff"><font face="Courier"><b><span style="BACKGROUND: rgb(0,0,0) 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">R
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A 0A </span></b></font></font>
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</p>
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</td>
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<td bgcolor="#000000" width="75%">
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<p><font color="#ffffff"><i>Set Accumulator to hex Value <font style="FONT-WEIGHT: bold" color="#ffff00">
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0A</font></i></font></p>
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</td>
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</tr>
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<tr bgcolor="#000000">
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<td bgcolor="#000000" width="25%">
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<p><font color="#00b8ff"><font face="Courier"><b><span style="BACKGROUND: rgb(0,0,0) 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">R
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A #A </span></b></font></font>
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</p>
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</td>
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<td bgcolor="#000000" width="75%">
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<p><font color="#ffffff"><i>Set Accumulator to hex Value <font style="FONT-WEIGHT: bold" color="#ffff00">
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0A</font></i></font></p>
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</td>
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</tr>
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<tr bgcolor="#000000">
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<td bgcolor="#000000" width="25%">
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<p><font color="#00b8ff"><font face="Courier"><b><span style="BACKGROUND: rgb(0,0,0) 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">R
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X A </span></b></font></font>
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</p>
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</td>
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<td bgcolor="#000000" width="75%">
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<p><font color="#ffffff"><i>Set Register X to Accumulator<6F>s Value</i></font></p>
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</td>
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</tr>
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<tr bgcolor="#000000">
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<td bgcolor="#000000" width="25%">
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<p><font color="#00b8ff"><font face="Courier"><b><span style="BACKGROUND: rgb(0,0,0) 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">R
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A A1 </span></b></font></font>
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</p>
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</td>
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<td bgcolor="#000000" width="75%">
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<p><font color="#ffffff"><i>If the symbol A1 exists, sets Accumulator to the <b>Address</b>
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of the symbol <b>A1</b><br>
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If the symbol A1 <b>doesn't</b> exist, sets Accumulator to the hex <b>Value</b> <font style="FONT-WEIGHT: bold" color="#ffff00">
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A1</font></i></font></p>
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</td>
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</tr>
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<tr bgcolor="#000000">
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<td bgcolor="#000000" width="25%">
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<p><font color="#00b8ff"><font face="Courier"><b><span style="BACKGROUND: rgb(0,0,0) 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">R
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A $A1 </span></b></font></font>
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</p>
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</td>
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<td bgcolor="#000000" width="75%">
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<p><font color="#ffffff"><i>If the symbol A1 exists, sets the Accumulator to the <b>Address</b>
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of symbol <b>A1<br>
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</b>If the symbol A1 <b>doesn't</b> exist, sets Accumulator to the hex Value <font style="FONT-WEIGHT: bold" color="#ffff00">
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A1</font></i></font></p>
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</td>
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</tr>
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<tr bgcolor="#000000">
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<td bgcolor="#000000" width="25%">
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<p><font color="#00b8ff"><font face="Courier"><b><span style="BACKGROUND: rgb(0,0,0) 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">R
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A #A1 </span></b></font></font>
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</p>
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</td>
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<td bgcolor="#000000" width="75%">
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<p><font color="#ffffff"><i>Sets Accumulator to the hex value <b><font color="#ffff00">A1</font></b></i></font></p>
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</td>
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</tr>
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</tbody>
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</table>
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<p>
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<br>
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</p>
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</body>
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</html>
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