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AppleWin/help/dbg-registers.html

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Updated AW-help's debugger section with Michael's v3 tutorial
2006-07-30 20:24:09 +00:00
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>AppleWin Debugger Tutorial</title>
<meta http-equiv="CONTENT-TYPE" content="text/html; charset=windows-1252">
</head>
<body style="DIRECTION: ltr" lang="en-US">
<h2><a name="Registers1"></a>Registers</h2>
<p>The command line now recognizes 6502 Registers.&nbsp; Namely,
</p>
<ul>
<li>
<p><b>A</b>, the Accumulator,</p>
<li>
<p style="MARGIN-BOTTOM: 0in"><b>X</b>, the 1<sup>st</sup> Index Register,</p>
<li>
<p style="MARGIN-BOTTOM: 0in"><b>Y</b>, the 2<sup>nd</sup> Index Register,</p>
<li>
<p style="MARGIN-BOTTOM: 0in"><b>PC</b>, the Program Counter,
</p>
<li>
<p style="MARGIN-BOTTOM: 0in"><b>S</b>, the Stack Pointer, and
</p>
<li>
<p><b>P</b>, the Processor Status Register (Flags).</p>
</li>
</ul>
<p>You can set a Register to a hex Value, Symbol, or Expression.&nbsp; (See the
section <a href="#Calculator">Calculator</a> for more examples of using
expressions.)&nbsp; The syntax is:</p>
<br>
<table bgcolor="#e6e6e6" border="0" cellpadding="2" cellspacing="0" width="75%">
<COLGROUP>
<col width="64">
<col width="192">
<tbody>
<tr bgcolor="#000000">
<td bgcolor="#000000" width="25%">
<p><font color="#ffffff"><b>Command</b></font></p>
</td>
<td bgcolor="#000000" width="75%">
<p style="FONT-STYLE: normal"><font color="#ffffff"><b>Effect</b></font></p>
</td>
</tr>
<tr bgcolor="#cccccc">
<td width="25%">
<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
r [=] ####</span></b></font></font></p>
</td>
<td width="75%">
<p><i><span style="BACKGROUND: 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">Set
Register to (a byte) Value, Symbol, or Address, or Expression.</span></i></p>
</td>
</tr>
<tr bgcolor="#999999">
<td width="25%">
<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
A ##</span></b></font></font></p>
</td>
<td width="75%">
<p><i><span style="BACKGROUND: 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">Set
Accumulator to (a byte) Value</span></i></p>
</td>
</tr>
<tr bgcolor="#cccccc">
<td width="25%">
<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
X ##</span></b></font></font></p>
</td>
<td width="75%">
<p><i><span style="BACKGROUND: 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">Set
Register X to (a byte) Value</span></i></p>
</td>
</tr>
<tr bgcolor="#999999">
<td width="25%">
<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
Y ##</span></b></font></font></p>
</td>
<td width="75%">
<p><i><span style="BACKGROUND: 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">Set
Register Y to (a byte) Value</span></i></p>
</td>
</tr>
<tr bgcolor="#cccccc">
<td width="25%">
<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
PC ####</span></b></font></font></p>
</td>
<td width="75%">
<p><i><span style="BACKGROUND: 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">Set
PC to (a full 16-bit) Address (Value)</span></i></p>
</td>
</tr>
<tr bgcolor="#999999">
<td width="25%">
<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
S ##</span></b></font></font></p>
</td>
<td width="75%">
<p><i><span style="BACKGROUND: 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">Set
Stack Register to (an 8-Bit) Offset</span></i></p>
</td>
</tr>
<tr bgcolor="#cccccc">
<td width="25%">
<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
P ##</span></b></font></font></p>
</td>
<td width="75%">
<p><i><span style="BACKGROUND: 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial">Set
Processor Status Register (flags) to (a byte) Value</span></i></p>
</td>
</tr>
</tbody>
</table>
<p><br>
<br>
</p>
<p><b>Notes</b>:</p>
<ul>
<li>
<p style="MARGIN-BOTTOM: 0in"><i>Since <b>A</b> refers to the Accumulator, you need to
prefix the hex number <b>A</b> with either:<br>
&nbsp;&nbsp;&nbsp;&nbsp;i) a zero '<b>0</b>', or<br>
&nbsp;&nbsp;&nbsp;&nbsp;ii) the hash '<b>#</b>' symbol (same as 6502 immediate
symbol.)</i></p>
</li>
</ul>
<ul>
<li>
<p><i>You can prefix a symbol with the dollar sign '<b>$</b>' to tell the parser it is
a symbol Address instead of a Value.</i></p>
<li>
<p><i>If a symbol is not defined, the expression will be the corresponding hex Value,
if possible.</i></p>
<li>
<p><i>Hex Values may be ambiguous, if their corresponding symbol is defined.&nbsp; To
avoid confusion, don<6F>t define symbols such as the popular $DEAD, $BEEF, $C0DE,
$CAFE, etc. An example is given with A1.</i></p>
</li>
</ul>
<br>
<p><font size="4"><b>Examples</b>:</font></p>
<table bgcolor="#000000" border="0" cellpadding="2" cellspacing="0" width="90%">
<COLGROUP>
<col width="64">
<col width="192">
<tbody>
<tr bgcolor="#00b8ff">
<td bgcolor="#30c0ff" width="25%">
<p><font color="#000000"><b>Input</b></font></p>
</td>
<td bgcolor="#30c0ff" width="75%">
<p><font color="#000000"><b>Effect</b></font></p>
</td>
</tr>
<tr bgcolor="#000000">
<td width="25%">
<p><font color="#00b8ff"><font face="Courier"><b>R PC FA62 </b></font></font>
</p>
</td>
<td width="75%">
<p><font color="#ffffff"><i>Set Program Counter to Value $<b><font color="#ffff00">FA62</font></b>
(RESET) </i></font>
</p>
</td>
</tr>
<tr bgcolor="#000000">
<td bgcolor="#000000" width="25%">
<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
PC RESET + 1</span></b></font></font></p>
</td>
<td bgcolor="#000000" width="75%">
<p><font color="#ffffff"><i>Set Program Counter to Address $<b><font color="#ffff00">FA63</font></b>
(RESET+1)</i></font></p>
</td>
</tr>
<tr bgcolor="#000000">
<td bgcolor="#000000" width="25%">
<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
X 2 </span></b></font></font>
</p>
</td>
<td bgcolor="#000000" width="75%">
<p><font color="#ffffff"><i>Set Register to Value <font style="FONT-WEIGHT: bold" color="#ffff00">
2</font></i></font></p>
</td>
</tr>
<tr bgcolor="#000000">
<td bgcolor="#000000" width="25%">
<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
Y 3 </span></b></font></font>
</p>
</td>
<td bgcolor="#000000" width="75%">
<p><font color="#ffffff"><i>Set Register to Value <font style="FONT-WEIGHT: bold" color="#ffff00">
3</font></i></font></p>
</td>
</tr>
<tr bgcolor="#000000">
<td bgcolor="#000000" width="25%">
<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
S 1FE </span></b></font></font>
</p>
</td>
<td bgcolor="#000000" width="75%">
<p><font color="#ffffff"><i>Set Stack Pointer to depth of one (Stack grows down from $01FF)</i></font></p>
</td>
</tr>
<tr bgcolor="#000000">
<td bgcolor="#000000" width="25%">
<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
S FF </span></b></font></font>
</p>
</td>
<td bgcolor="#000000" width="75%">
<p><font color="#ffffff"><i>Set Stack Pointer to top of stack (Empty)</i></font></p>
</td>
</tr>
<tr bgcolor="#000000">
<td bgcolor="#000000" width="25%">
<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
A 0A </span></b></font></font>
</p>
</td>
<td bgcolor="#000000" width="75%">
<p><font color="#ffffff"><i>Set Accumulator to hex Value <font style="FONT-WEIGHT: bold" color="#ffff00">
0A</font></i></font></p>
</td>
</tr>
<tr bgcolor="#000000">
<td bgcolor="#000000" width="25%">
<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
A #A </span></b></font></font>
</p>
</td>
<td bgcolor="#000000" width="75%">
<p><font color="#ffffff"><i>Set Accumulator to hex Value <font style="FONT-WEIGHT: bold" color="#ffff00">
0A</font></i></font></p>
</td>
</tr>
<tr bgcolor="#000000">
<td bgcolor="#000000" width="25%">
<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
X A </span></b></font></font>
</p>
</td>
<td bgcolor="#000000" width="75%">
<p><font color="#ffffff"><i>Set Register X to Accumulator<6F>s Value</i></font></p>
</td>
</tr>
<tr bgcolor="#000000">
<td bgcolor="#000000" width="25%">
<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
A A1 </span></b></font></font>
</p>
</td>
<td bgcolor="#000000" width="75%">
<p><font color="#ffffff"><i>If the symbol A1 exists, sets Accumulator to the <b>Address</b>
of the symbol <b>A1</b><br>
If the symbol A1 <b>doesn't</b> exist, sets Accumulator to the hex <b>Value</b> <font style="FONT-WEIGHT: bold" color="#ffff00">
A1</font></i></font></p>
</td>
</tr>
<tr bgcolor="#000000">
<td bgcolor="#000000" width="25%">
<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
A $A1 </span></b></font></font>
</p>
</td>
<td bgcolor="#000000" width="75%">
<p><font color="#ffffff"><i>If the symbol A1 exists, sets the Accumulator to the <b>Address</b>
of symbol <b>A1<br>
</b>If the symbol A1 <b>doesn't</b> exist, sets Accumulator to the hex Value <font style="FONT-WEIGHT: bold" color="#ffff00">
A1</font></i></font></p>
</td>
</tr>
<tr bgcolor="#000000">
<td bgcolor="#000000" width="25%">
<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
A #A1 </span></b></font></font>
</p>
</td>
<td bgcolor="#000000" width="75%">
<p><font color="#ffffff"><i>Sets Accumulator to the hex value <b><font color="#ffff00">A1</font></b></i></font></p>
</td>
</tr>
</tbody>
</table>
<p>
<br>
&nbsp;
</p>
</body>
</html>
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