C (Compare) - Two memory blocks comparison

Format: C [segment1:][address1],[segment2:][address2]

     Memory blocks are compared according to addresses specified in
'segment1', 'address1' and 'segment2', 'address2' slots. By default, the
last addresses used in the preceding C command are chosen. If there are no
differences between the compared lines the message "Strings are identical"
is displayed.  Otherwise, two samples are displayed on the screen showing
underlined differences. To continue comparison, strike the space bar.