mm [/bwl] <addr><addr>/b/w/lmm/w 100
00000100 - 00000000? _
^ -- go back one increment
. -- quit edit mode, return to prompt
=modification -- makes the modification and displays the
same location again, instead of the next
/b, /w or /l option
is not specified, mm will use the default size of the PDE
environment, which can be set using the size command.radix command.