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<!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 = "Breakpoints" > < / a > Breakpoints< / h2 >
< p > You now have a variety of options when specifying a breakpoint.
Breakpoints can also be disabled, and later re-enabled. This lets ones
set a bunch of breakpoints, and quickly re-activate them without having to
re-enter the breakpoint logic.< / p >
< p > < br >
< br >
< / p >
< table border = "0" cellpadding = "2" cellspacing = "0" width = "90%" >
< 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" > BPA
r [op] value< / 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" > Adds
(conditional) Breakpoint.< br >
Default operator is equal <20> =<3D> < br >
(In a future version, will dispatch to BPX, BPR, BPP, or BPIO.)< / 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" > BPX< br >
BPX expression< br >
BPX address[,len]< br >
BPX [op] symbol< / span > < / b > < / font > < / font > < / p >
< / td >
< 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 Breakpoint trigger to stop executing when the PC is within the range of 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 comparison operator is equal <20> =<3D> < / span > < / i > < / p >
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< / 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" > BP< / span > < / b > < / font > < / font > < / p >
< / td >
< 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 an Alias for BPX.< br >
(In a future version, will also support Loading and Saving of breakpoints.)< / span > < / i > < / p >
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< / td >
< / tr >
< tr bgcolor = "#999999" >
< 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 address[,len]< / span > < / b > < / font > < / font > < / p >
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< / td >
< 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 Breakpoint trigger when memory is accessed by 6502.< / span > < / i > < / p >
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< / td >
< / tr >
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< tr bgcolor = "#cccccc" >
< 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 address[,len]< / span > < / b > < / font > < / font > < / p >
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< / td >
< 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 Breakpoint trigger when memory is read by 6502.< / span > < / i > < / p >
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< / td >
< / tr >
< tr bgcolor = "#999999" >
< 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 address[,len]< / span > < / b > < / font > < / font > < / p >
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< / td >
< 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 Breakpoint trigger when memory is written by 6502.< / span > < / i > < / p >
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< / td >
< / tr >
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< tr bgcolor = "#cccccc" >
< 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 reg [op] value< / span > < / b > < / font > < / font > < / p >
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< / td >
< 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 Breakpoint trigger when Register<65> s <20> reg<65> value is compared to the Value.< / span > < / i > < / p >
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< / td >
< / tr >
< tr bgcolor = "#999999" >
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< 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" > BPV vpos[,len]< / 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" > Add Breakpoint trigger when video-scanner's vertical position matches vpos. (NB. Auto-disable when hit.)< / span > < / i > < / p >
< / td >
< / tr >
< 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" > BPD< / span > < / b > < / font > < / font > < / p >
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< / td >
< 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 Breakpoint (grayed out).< / span > < / i > < / p >
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< / td >
< / 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" > BPE< / span > < / b > < / font > < / font > < / p >
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< / td >
< 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 Breakpoint (colored red).< / span > < / i > < / p >
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< / td >
< / 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" > BPC #< / span > < / b > < / font > < / font > < / p >
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< / td >
< 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 specified Breakpoint.< br >
Note: The asterisk <20> *<2A> may be used to clear all breakpoints.< / span > < / i > < / p >
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< / td >
< / 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" > BPL< / span > < / b > < / font > < / font > < / p >
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< / td >
< 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 Breakpoints.< / span > < / i > < / p >
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< / td >
< / tr >
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< tr bgcolor = "#cccccc" >
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< 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" > BPIO< / span > < / b > < / font > < / font > < / p >
< / td >
< 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 a future version, will add Breakpoint trigger on memory read or write.)< / span > < / i > < / p >
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< / td >
< / tr >
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< tr bgcolor = "#999999" >
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< 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" > BPP< / span > < / b > < / font > < / font > < / p >
< / td >
< 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 a future version, will add Breakpoint trigger on specific flag cleared or set.)< / span > < / i > < / p >
< / td >
< / 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" > BRK [0|1|2|3|all] [on|off]< / span > < / b > < / font > < / font > < / p >
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< / td >
< td width = "75%" >
< p > < i > < span style = "BACKGROUND: 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial" > Break on BRK or Invalid 1-3 byte opcodes< / span > < / i > < / p >
< / td >
< / tr >
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< tr bgcolor = "#999999" >
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< 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" > BRKOP [opcode]< / 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" > Break on Opcode< / span > < / i > < / p >
< / td >
< / 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" > BRKINT [on|off]< / span > < / b > < / font > < / font > < / p >
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< / td >
< td width = "75%" >
< p > < i > < span style = "BACKGROUND: 0% 50%; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial" > Break on Interrupt< / span > < / i > < / p >
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< / td >
< / tr >
< / tbody >
< / table >
< p > < br >
< br >
< / p >
< p > The general format for the conditional breakpoint is:< / p >
< ul >
< li >
< p style = "MARGIN-BOTTOM: 0in" > < i > BPA register [operator] value.< / i > < / p >
< / li >
< / ul >
< p > You can use the following comparison operators:< / p >
< table border = "1" cellpadding = "2" cellspacing = "0" width = "75%" >
< COLGROUP >
< col width = "26" >
< col width = "64" >
< col width = "166" >
< tbody >
< tr bgcolor = "#000000" >
< td width = "10%" >
< p > < font color = "#ffffff" > < b > Op< / b > < / font > < / p >
< / td >
< td width = "25%" >
< p > < font color = "#ffffff" > < b > Name< / b > < / font > < / p >
< / td >
< td width = "65%" >
< p > < font color = "#ffffff" > < b > Effect< / b > < / font > < / p >
< / td >
< / tr >
< tr >
< td width = "10%" >
< p > =< / p >
< / td >
< td width = "25%" >
< p > Equal< / p >
< / td >
< td width = "65%" >
< p > < i > Break when register is equal to value.< / i > < / p >
< / td >
< / tr >
< tr >
< td width = "10%" >
< p > !< / p >
< / td >
< td width = "25%" >
< p > Not Equal< / p >
< / td >
< td width = "65%" >
< p > < i > Break when register is not equal to value.< / i > < / p >
< / td >
< / tr >
< tr >
< td width = "10%" >
< p > < < / p >
< / td >
< td width = "25%" >
< p > Less Than< / p >
< / td >
< td width = "65%" >
< p > < i > Break when register is less than value.< / i > < / p >
< / td >
< / tr >
< tr >
< td width = "10%" >
< p > > < / p >
< / td >
< td width = "25%" >
< p > Greater Than< / p >
< / td >
< td width = "65%" >
< p > < i > Break when register is greater than value.< / i > < / p >
< / td >
< / tr >
< / tbody >
< / table >
< p > < br >
< br >
< / p >
< p > Breaking on any of the 6502 registers is fully supported:< / p >
< table border = "1" cellpadding = "2" cellspacing = "0" width = "75%" >
< COLGROUP >
< col width = "26" >
< col width = "64" >
< col width = "166" >
< thead >
< tr bgcolor = "#000000" >
< td width = "10%" >
< p > < font color = "#ffffff" > < b > Reg< / b > < / font > < / p >
< / td >
< td width = "25%" >
< p > < font color = "#ffffff" > < b > Name< / b > < / font > < / p >
< / td >
< td width = "65%" >
< p > < font color = "#ffffff" > < b > Effect< / b > < / font > < / p >
< / td >
< / tr >
< / thead >
< tbody >
< tr >
< td width = "10%" >
< p > A< / p >
< / td >
< td width = "25%" >
< p > Accumulator< / p >
< / td >
< td width = "65%" >
< p > < i > Break when Accumulator is triggered.< / i > < / p >
< / td >
< / tr >
< tr >
< td width = "10%" >
< p > X< / p >
< / td >
< td width = "25%" >
< p > Register X< / p >
< / td >
< td width = "65%" >
< p > < i > Break when Index X is triggered.< / i > < / p >
< / td >
< / tr >
< tr >
< td width = "10%" >
< p > Y< / p >
< / td >
< td width = "25%" >
< p > Register Y< / p >
< / td >
< td width = "65%" >
< p > < i > Break when Index Y is triggered.< / i > < / p >
< / td >
< / tr >
< tr >
< td width = "10%" >
< p > PC< / p >
< / td >
< td width = "25%" >
< p > Program Counter< / p >
< / td >
< td width = "65%" >
< p > < i > Break when PC is triggered.< / i > < / p >
< / td >
< / tr >
< tr >
< td width = "10%" >
< p > S< / p >
< / td >
< td width = "25%" >
< p > Stack Pointer< / p >
< / td >
< td width = "65%" >
< p > < i > Break when Stack Pointer is triggered.< / i > < / p >
< / td >
< / tr >
< tr >
< td width = "10%" >
< p > P< / p >
< / td >
< td width = "25%" >
< p > Processor Status (flags)< / p >
< / td >
< td width = "65%" >
< p > < i > Break when flags are triggered.< / i > < / p >
< / td >
< / tr >
< / tbody >
< / table >
< br >
< h2 > < font size = "4" > Notes:< / font > < / h2 >
< ul >
< li >
< p > < i > BPP, Breaking on a specific flag (either set, or cleared) is forth-coming in a
future version.< / i > < / p >
< / li >
< / ul >
< br >
< p > < font size = "4" > < b > Examples< / b > :< / font > < / p >
< table bgcolor = "#000000" border = "0" cellpadding = "2" cellspacing = "0" width = "75%" >
< 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 > BPX < F000< / b > < / font > < / font > < / p >
< / td >
< td width = "75%" >
< p > < font color = "#ffffff" > < i > Add Breakpoint when PC < $< b > < font color = "#ffff00" > FA62< / font > < / b > .< / i > < / font > < / p >
< / td >
< / tr >
< tr bgcolor = "#000000" >
< td bgcolor = "#000000" width = "25%" >
< p > < font color = "#00b8ff" > < font face = "Courier" > < b > BPX PC < D000< / b > < / font > < / font > < / p >
< / td >
< td bgcolor = "#000000" width = "75%" >
< p > < font color = "#ffffff" > < i > Add Breakpoint when PC < $ < b > < font color = "#ffff00" > D000< / font > .< / b > < / i > < / font > < / p >
< / td >
< / tr >
< tr bgcolor = "#000000" >
< 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 A 0< / span > < / b > < / font > < / font > < / p >
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< / td >
< td bgcolor = "#000000" width = "75%" >
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< p > < font color = "#ffffff" > < i > Add Breakpoint when Accumulator is zero.< / i > < / font > < / p >
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< / td >
< / tr >
< tr bgcolor = "#000000" >
< 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 A ! 0< / span > < / b > < / font > < / font > < / p >
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< / td >
< td bgcolor = "#000000" width = "75%" >
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< p > < font color = "#ffffff" > < i > Add Breakpoint when Accumulator is < b > not< / b > zero.< / i > < / font > < / p >
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< / td >
< / tr >
< tr bgcolor = "#000000" >
< td bgcolor = "#000000" width = "25%" >
2021-10-16 15:57:00 +00:00
< 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 S < 1FF< / span > < / b > < / font > < / font > < / p >
2006-07-30 20:24:09 +00:00
< / td >
< td bgcolor = "#000000" width = "75%" >
2021-10-28 20:09:36 +00:00
< p > < font color = "#ffffff" > < i > Add Breakpoint when Stack has had something pushed onto it.< / i > < / font > < / p >
2006-07-30 20:24:09 +00:00
< / td >
< / tr >
2022-10-08 18:17:47 +00:00
< 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" > BPV A0< / span > < / b > < / font > < / font > < / p >
< / td >
< td bgcolor = "#000000" width = "75%" >
< p > < font color = "#ffffff" > < i > Add Breakpoint when video-scanner is at line 160 ($A0) which is the start of the MIXED area.< / i > < / font > < / p >
< / td >
< / tr >
2021-10-16 15:57:00 +00:00
< 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" > BRK ON< / span > < / b > < / font > < / font > < / p >
< / td >
< td bgcolor = "#000000" width = "75%" >
2021-12-11 14:32:00 +00:00
< p > < font color = "#ffffff" > < i > Break execution when the opcode to be executed is $00 (ie. BRK).< / 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" > BRK ALL ON< / span > < / b > < / font > < / font > < / p >
< / td >
< td bgcolor = "#000000" width = "75%" >
< p > < font color = "#ffffff" > < i > Break execution when the opcode to be executed is $00 (ie. BRK) or any Invalid opcode.< / 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" > BRK 0 OFF< / span > < / b > < / font > < / font > < / p >
< / td >
< td bgcolor = "#000000" width = "75%" >
< p > < font color = "#ffffff" > < i > Disable breaking execution when the opcode to be executed is $00 (ie. BRK).< / i > < / font > < / p >
2021-10-16 15:57:00 +00:00
< / 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" > BRKOP 6C< / span > < / b > < / font > < / font > < / p >
< / td >
< td bgcolor = "#000000" width = "75%" >
2021-12-11 14:32:00 +00:00
< p > < font color = "#ffffff" > < i > Break execution when the opcode to be executed is $6C (ie. JMP (ABS)).< / i > < / font > < / p >
2021-10-16 15:57:00 +00:00
< / td >
< / tr >
< tr bgcolor = "#000000" >
< td bgcolor = "#000000" width = "25%" >
2021-10-28 20:09:36 +00:00
< 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" > BRKINT ON< / span > < / b > < / font > < / font > < / p >
2021-10-16 15:57:00 +00:00
< / td >
< td bgcolor = "#000000" width = "75%" >
2021-10-28 20:09:36 +00:00
< p > < font color = "#ffffff" > < i > Break execution just after an interrupt occurs.< / i > < / font > < / p >
2021-10-16 15:57:00 +00:00
< / td >
< / tr >
2006-07-30 20:24:09 +00:00
< / tbody >
< / table >
< br >
< / body >
< / html >
