Commodore PC Ms-Dos 3.2 User's Manual page 306

234 MS-DOS User's Reference
u
Examples:
< \
Using the Register If you type the following command, debug displays all registers,
command flags, and the decoded instruction for the current location:
If the location is CS:11A, for example, the display will look similar
to this:
AX=0E00 BX=00FF CX=0007 DX=01FF SP=039D BP=0000
SI=005C DI=0000 DS=04BA ES=04BA SS=04BA CS=04BA
IP=011A NV UP DI NG NZ AC PE NC
04BA:011A CD21 INT 21
If you then type the following command, debug will display these
flags:
RF
NV UP DI NG NZ AC PE NC -
u
Now, you could type any valid flag designation, in any order, with
or without spaces. For example:
NV UP DI NG NZ AC PE NC - PLEICY
In response, debug would display the debug prompt. To see the
changes, type either the R or RF command:
RF
NV UP El PL NZ AC PE CY -
Press the return key to leave the flags this way or to specify dif
ferent flag values. (J
u
u