Tandy 1000 MS-DOS Reference Manual page 305

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Chapter 13 / The DEBUG Utility
The flags are listed below with their codes for set and clear:
Flag Name Set Clear
Overflow (yes/no) OV NV
Direction (decrement/increment) DN UP
Interrupt(enable/disable) EI DI
Sign (negative/positive) NG PL
Zero (yes/no) ZR NZ
Auxiliary carry (yes/no) AC NA
Parity (even/odd) PE PO
Carry (yes/no) CY NC
At the RF command, DEBUG displays the flags in the order
shown above at the beginning of a line. The hyphen prompt ( - )
appears at the end of the line. Now you can change any of the
flag values by typing alphabetic pairs, in any order. You need
not leave spaces between the flag entries. Press
[ENTER
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to make
the changes and exit the command. Flags for which you did not
type a new value remain unchanged.
Examples
RW!@]
causes DEBUG to display all registers, flags, and the next
instruction to be executed. For example, if the location is
CS:llA, the display looks similar to this:
r:
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AX=0E00 BX=00FF
SP=039D BP=0000
DS=04BA ES=04BA
IP=011A NV UP DI
04BA:011A CD21
CX=0007 DX=01FF
SI=005C DI=0000
SS=04BA CS=04BA
NG NZ AC PE NC
INT 21
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ENTER
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DEBUG displays. the flags
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NV UP DI NG NZ AC PE NC-
; - '
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