To start the debugger, enter "DEBUG"

ctrlX to delete an entire line

Operators------------------------------
-		Negation
&		Logical AND
!		Logical OR
*		Multipication
/		Division
+		Addition
-		Subtraction

Operands------------------------------
%0-1		Binary constant
#0-9		Decimal constant
0-9,A-F		Hexadecimal constant
'x		8 bit character constant
"xx		16 bit character constant
.		DEBUG's current memory address
..		DEBUG's prior memory address
:A		Accumulator A
:B		Accumulator B
:D		Accumulator D
:U		U register
:X		X register
:Y		Y register
:DP		Direct page register
:SP		Stack pointer
:PC		Program counter
:cc		Condition codes register

Expression is any combination of operators and operands

Commands------------------------------
Format		Description
-----------	-----------------------
space		Calculator function
.		Displays the current value of .
null		Increments . and displays the new value of .
.expr		Changes the value of .
..		Restores the last value of .
=expr		Changes the value of . then increments .
:reg		Display register content
:		Display all registers
:reg expr	Assigns a new value to a register
B		Display all breakpoints
Bexpr		Set a breakpoint
K		Kills (removes) all breakpoints
Kexpr		Kills the breakpoint at <expression>
Emodname	Prepares DEBUG for testing a module
Gexpr		See manual
Lmodname	See manual
Cexpr1 expr2	Clear and test memory
Mexpr1 expr2	Memory display
Sexpr1 expr2	Search for expr2 starting at . and ending at expr1
$		Calls the OS-9 shell
$command	Executes <command> and returns to bdebugger
Q		Ends debugging session