Select a command:
- --
| BC | - -Breakpoint Clear | - -
| BD | - -Breakpoint Disable | - -
| BE | - -Breakpoint Enable | - -
| BP | - -Breakpoint Set | - -
| BW | - -Black and White | - -
| COL | - -Color | - -
| G | - -Go | - -
| I | - -Input | - -
| KEY | - -Feed Keystroke | - -
| MD | - -Memory Dump | - -
| MDC | - -Code Dump | - -
| ME | - -Memory Enter | - -
| MF | - -Memory Fill | - -
| O | - -Output | - -
| R | - -Set Register | - -
| Rf | - -Reset Flag | - -
| Sf | - -Set Flag | - -
| T | - -Trace | - -
| ZAP | - -Remove Instruction | - -
|
-
-
-
Syntax:
- --- -BC list
- -BC *
- -
Description:
- --- -Permanently removes one or -more breakpoints by number, or all breakpoints if the wildcard (*) is -used.
- -
Example:
- --- -To remove breakpoints one -and two, type:
- -BC 1 2
- -
Syntax:
- --- -BD list
- -BD *
- -
Description:
- --- -Temporarily disables one or -more breakpoints by number, or all breakpoints if the wildcard (*) is -used.
- -
Example:
- --- -To temporarily disable -breakpoints one and two, type:
- -BD 1 2
- -
Syntax:
- --- -BE list
- -BE *
- -
Description:
- --- -Enables one or more -breakpoints which had previously been disabled with the Breakpoint -Disable (BD) command.
- -
Examples:
- --- -To enable breakpoints one -and two, type:
- -BE 1 2
- -To enable all breakpoints, -type:
- -BE *
- -
Syntax:
- --- -BP
- -BP address
- -BP addressLlength
- -
Description:
- --- -Sets a breakpoint on the -given address or range of addresses. If the breakpoint is on a memory -location, it will be triggered if the instruction at that location is -about to be executed, or if the memory location is read or written to. -If the breakpoint is on an I/O port, it will be triggered if the port -is accessed.
- -After setting a breakpoint, -use the Go (G) command to start running the emulator in stepping mode. -Breakpoint functionality is available only in stepping mode, not in -normal running mode.
- -
Examples:
- --- -To set a breakpoint at the -current execution address (the address contained in the PC register) -type:
- -BP
- -To set a breakpoint at -address $BF00, the ProDOS Machine Language Interface, type:
- -BP BF00
- -To set a breakpoint on I/O -ports $C0E0-$C0EF, trapping all disk I/O on slot 6, type:
- -BP C0E0L10
- -
Syntax:
- --- -BW
- -
Description:
- --- -Changes the debugger screen -to black and white mode.
- -
Syntax:
- --- -COL
- -
Description:
- --- -Changes the debugger screen -to color mode.
- -
Syntax:
- --- -G
- -G address
- -
Description:
- --- -Starts running the emulator -in stepping mode. Stepping mode is slower than the normal running mode, -but it allows execution to be interrupted by a triggered breakpoint, -the escape key, or execution reaching the address given in the Go -command.
- -
Example:
- --- -To continue execution until -the program counter reaches $C27D, the address of WAITKEY1, -type:
- -G C27D
- -
Syntax:
- --- -I address
- -
Description:
- --- -Simulates reading the -specified I/O port.
- -
Example:
- --- -To simulate a read of port -$C083, switching the banked memory at $D000 from ROM to RAM, -type:
- -I C083
- -
Syntax:
- --- -KEY value
- -
Description:
- --- -Simulates pressing a key. -The given value is passed to the next program that reads the keyboard -data port at $C00X.
- -
Example:
- --- -To simulate pressing the -Return key, type:
- -KEY 8D
- -
Syntax:
- --- -MD address
- -
Description:
- --- -Displays the contents of -memory starting at the specified address, in hexadecimal -notation.
- -
Example:
- --- -To display memory at $BF00, -type:
- -MD BF00
- -
Syntax:
- --- -MDC address
- -
Description:
- --- -Displays disassembled code -starting at the specified address.
- -
Example:
- --- -To display code starting at -$F832, type:
- -MDC F832
- -
Syntax:
- --- -ME address -value(s)
- -
Description:
- --- -Writes the given values to -memory locations starting at the specified address.
- -
Example:
- --- -To write $A9 to memory -location $FBE4 and $0A to memory location $FBE5, type:
- -ME FBE4 A9 0A
- -
Syntax:
- --- -MF addressLlength -value
- -
Description:
- --- -Fills a range of memory -locations with the given value.
- -
Example:
- --- -To fill memory locations -$FBE4 through $FBEE with the value $EA, type:
- -MF FBE4L0B EA
- -
Syntax:
- --- -O address -value
- -
Description:
- --- -Writes the specified value -to the given I/O port. If value is not specified, a value of zero is -assumed.
- -
Example:
- --- -To write $FF to I/O port -$C070, type:
- -O C070 FF
- -
Syntax:
- --- -R register=value
- -where register -is:
- -- - - -
- -- - - -A - -Accumulator - -- - - -X - -X index - -- - - -Y - -Y index - -- - - -PC - -Program counter - -- - - - -SP - -Stack pointer - -
Description:
- --- -Sets the specified register -in the emulated CPU to the given value. The value is adjusted if -necessary to fit the valid range of values for the specified register.
- -
Examples:
- --- -To set the value in the -accumulator to $80, type:
- -R A=80
- -To set the program counter -to $FA62, type:
- -R PC=FA62
- -
Syntax:
- --- -Rf
- -where f is:
- -- - - -
- -- - - -N - -Sign flag - -- - - -V - -Overflow flag - -- - - -R - -Reserved flag - -- - - -B - -Break flag - -- - - -D - -Decimal flag - -- - - -I - -Interrupt flag - -- - - -Z - -Zero flag - -- - - - -C - -Carry flag - -
Description:
- --- -Clears the specified -processor status flag.
- -
Example:
- --- -To clear the carry flag, -type:
- -RC
- -
Syntax:
- --- -Sf
- -where f is:
- -- - - -
- -- - - -N - -Sign flag - -- - - -V - -Overflow flag - -- - - -R - -Reserved flag - -- - - -B - -Break flag - -- - - -D - -Decimal flag - -- - - -I - -Interrupt flag - -- - - -Z - -Zero flag - -- - - - -C - -Carry flag - -
Description:
- --- -Sets the specified processor -status flag.
- -
Example:
- --- -To set the decimal flag, -type:
- -SD
- -
Syntax:
- --- -T
- -T count
- -
Description:
- --- -Executes one or more -instructions at the current program counter (PC) location.
- -
Example:
- --- -To execute five assembly -language instructions, type:
- -T 5
- -
Syntax:
- --- -ZAP
- -
Description:
- --- -Removes the current -instruction (the instruction to which PC points) by replacing it with -one or more NOP instructions.
- -
AppleWin includes a complete -symbolic -debugger which you can use to examine the internal workings of -Apple programs. If you're interested in writing Apple II assembly -language programs or modifying existing ones, you'll find the -debugger to be an invaluable aid.
- -For more information, select -one of the -following topics:
- -