2006-07-30 20:24:09 +00:00
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<!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="Breakpoints"></a>Breakpoints</h2>
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<p>You now have a variety of options when specifying a breakpoint.
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Breakpoints can also be disabled, and later re-enabled. This lets ones
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set a bunch of breakpoints, and quickly re-activate them without having to
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re-enter the breakpoint logic.</p>
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<p><br>
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<br>
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</p>
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<table 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="#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">BPA
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r [op] value</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">Adds
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(conditional) Breakpoint.<br>
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Default operator is equal <20>=<3D><br>
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(In a future version, will dispatch to BPX, BPR, BPP, or BPIO.)</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">BPX<br>
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BPX expression<br>
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BPX address[,len]<br>
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BPX [op] symbol</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">Add
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Breakpoint trigger to stop executing when the PC is within the range of
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the Address, Symbol, or Expression. i.e. Range is: [addr,addr+len)<br>
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Default length is 1.<br>
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Default comparision operator is equal <20>=<3D></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">BP</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">Currently
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an Alias for BPX.<br>
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(In a future version, will also support Loading and Saving of
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breakpoints.)</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">BPM
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address[,len]</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">Add
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Breakpoint trigger when memory is accessed by 6502.</span></i></p>
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</td>
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</tr>
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2019-10-22 20:42:55 +00:00
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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">BPMR
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address[,len]</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">Add
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Breakpoint trigger when memory is read by 6502.</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">BPMW
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address[,len]</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">Add
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Breakpoint trigger when memory is written by 6502.</span></i></p>
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</td>
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</tr>
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2006-07-30 20:24:09 +00:00
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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">BPR
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reg [op] value</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">Add
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Breakpoint trigger when Register<65>s <20>reg<65>
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value is compared to the 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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2009-12-12 11:40:11 +00:00
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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">BPD</span></b></font></font></p>
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2006-07-30 20:24:09 +00:00
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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">Disable
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Breakpoint (grayed out).</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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2009-12-12 11:40:11 +00:00
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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">BPE</span></b></font></font></p>
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2006-07-30 20:24:09 +00:00
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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">Enable
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Breakpoint (colored red).</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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2009-12-12 11:40:11 +00:00
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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">BPC
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#</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">Clear
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specified Breakpoint.<br>
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2009-12-12 11:40:11 +00:00
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Note: The asterisk <20>*<2A> may be used to clear all
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2006-07-30 20:24:09 +00:00
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breakpoints.</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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2009-12-12 11:40:11 +00:00
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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">BPL</span></b></font></font></p>
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2006-07-30 20:24:09 +00:00
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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">List
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Breakpoints.</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">BPIO</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">(In
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a future version, will add Breakpoint trigger on memory read or write.)</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">BPP</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">(In
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a future version, will add Breakpoint trigger on specific flag cleared
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or set.)</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>The general format for the conditional breakpoint is:</p>
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<ul>
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<li>
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<p style="MARGIN-BOTTOM: 0in"><i>BPA register [operator] value.</i></p>
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</li>
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</ul>
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<p>You can use the following comparison operators:</p>
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<table border="1" cellpadding="2" cellspacing="0" width="75%">
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<COLGROUP>
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<col width="26">
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<col width="64">
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<col width="166">
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<tbody>
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<tr bgcolor="#000000">
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<td width="10%">
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<p><font color="#ffffff"><b>Op</b></font></p>
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</td>
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<td width="25%">
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<p><font color="#ffffff"><b>Name</b></font></p>
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</td>
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<td width="65%">
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<p><font color="#ffffff"><b>Effect</b></font></p>
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</td>
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</tr>
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<tr>
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<td width="10%">
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<p>=</p>
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</td>
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<td width="25%">
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<p>Equal</p>
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</td>
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<td width="65%">
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<p><i>Break when register is equal to value.</i></p>
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</td>
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</tr>
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<tr>
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<td width="10%">
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<p>!</p>
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</td>
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<td width="25%">
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<p>Not Equal</p>
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</td>
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<td width="65%">
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<p><i>Break when register is not equal to value.</i></p>
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</td>
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</tr>
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<tr>
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<td width="10%">
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<p><</p>
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</td>
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<td width="25%">
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<p>Less Than</p>
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</td>
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<td width="65%">
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<p><i>Break when register is less than value.</i></p>
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</td>
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</tr>
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<tr>
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<td width="10%">
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<p>></p>
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</td>
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<td width="25%">
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<p>Greater Than</p>
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</td>
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<td width="65%">
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<p><i>Break when register is greater than value.</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>Breaking on any of the 6502 registers is fully supported:</p>
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<table border="1" cellpadding="2" cellspacing="0" width="75%">
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<COLGROUP>
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<col width="26">
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<col width="64">
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<col width="166">
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<thead>
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<tr bgcolor="#000000">
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<td width="10%">
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<p><font color="#ffffff"><b>Reg</b></font></p>
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</td>
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<td width="25%">
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<p><font color="#ffffff"><b>Name</b></font></p>
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</td>
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<td width="65%">
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<p><font color="#ffffff"><b>Effect</b></font></p>
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</td>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td width="10%">
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<p>A</p>
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</td>
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<td width="25%">
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<p>Accumulator</p>
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</td>
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<td width="65%">
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<p><i>Break when Accumulator is triggered.</i></p>
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</td>
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</tr>
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<tr>
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<td width="10%">
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<p>X</p>
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</td>
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<td width="25%">
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<p>Register X</p>
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</td>
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<td width="65%">
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<p><i>Break when Index X is triggered.</i></p>
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</td>
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</tr>
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<tr>
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<td width="10%">
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<p>Y</p>
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</td>
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<td width="25%">
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<p>Register Y</p>
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</td>
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<td width="65%">
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<p><i>Break when Index Y is triggered.</i></p>
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</td>
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</tr>
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<tr>
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<td width="10%">
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<p>PC</p>
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</td>
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<td width="25%">
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<p>Program Counter</p>
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</td>
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<td width="65%">
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<p><i>Break when PC is triggered.</i></p>
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</td>
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</tr>
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<tr>
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<td width="10%">
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<p>S</p>
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</td>
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<td width="25%">
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<p>Stack Pointer</p>
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</td>
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<td width="65%">
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<p><i>Break when Stack Pointer is triggered.</i></p>
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</td>
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</tr>
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<tr>
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<td width="10%">
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<p>P</p>
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</td>
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<td width="25%">
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<p>Processor Status (flags)</p>
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</td>
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<td width="65%">
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<p><i>Break when flags are triggered.</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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<br>
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<h2><font size="4">Notes:</font></h2>
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<ul>
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<li>
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<p><i>BPP, Breaking on a specific flag (either set, or cleared) is forth-coming in a
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future version.</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="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="#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>BPX < F000</b></font></font></p>
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</td>
|
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<td width="75%">
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<p><font color="#ffffff"><i>Add Breakpoint when PC < $<b><font color="#ffff00">FA62</font></b>.</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>BPX PC < D000</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>Add Breakpoint when PC < $ <b><font color="#ffff00">D000</font>.</b></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">BPR
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A 0</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>Adds Breakpoint when Accumulator is zero.</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">BPR
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A ! 0</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>Adds Breakpoint when Accumulator is <b>not</b> zero.</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">BPR
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S < 1FF</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>Adds Breakpoint when Stack has had something pushed onto it.</i></font></p>
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</td>
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</tr>
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</tbody>
|
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|
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</table>
|
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<br>
|
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</body>
|
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</html>
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