Commodore PC Ms-Dos 3.2 User's Manual page 310

238 MS-DOS User's Reference
Now, suppose you type the following:
U
U
u
If the bytes in some addresses are altered, the disassembler alters
the instruction statements. You can then type the U command for .
the changed locations, the new instructions viewed, and the ^-^
disassembled code used to edit the source file.
U
U04ba:0100
0108
The display would now show:
04BA:0100
04BA:0103
04BA:0104
04BA:01Q6
206472
69
7665
207370
AND
DB
JBE
AND
[SI+72],AH
69
016B
CBP+DI+70],DH
U
u
u
u
u
u