Commodore PC - Page 305

Debug 233
n
The flags are listed below with their codes for SET and CLEAR:
Flag name Set Clear
Overflow
Direction
Interrupt
Sign
Zero
Auxiliary Carry
Parity
Carry
OV
DN Decrement
El Enabled
NG Negative
ZR
AC
PE Even
CY
NV
UP Increment
DI Disabled
PL Plus
NZ
NA
POOdd
NC
Whenever you type the RF command, the flags are displayed
(in the order shown in the previous table) in a row at the begin
ning of a line. At the end of the list of flags, debug displays a
hyphen (-).
You may enter new flag values in any order as alphabetic pairs.
You do not have to leave spaces between these values. To exit the
R command, press the return key. Any flags for which you did
not specify new values remain unchanged.
If you type more than one value for a flag, debug returns a DF
error message. If you enter a flag code other than one of those
shown in the table above, debug returns a BF error message. In
both cases, the flags up to the error in the list are changed; those
f\ flags at and after the error are not.
When you start debug, the segment registers are set to the bot-
^^^ torn of free memory, the Instruction Pointer is set to 0100H, all
() flags are cleared, and the remaining registers are set to zero.