These are some notes on modifying CP/M-816:

To change the step rate for floppy disks in cpm.sys:

     A>ddt86
     - rcpm.sys
     - s28c4
     xxxx:28C4 80 d0          for a 3 ms step rate
     xxxx:28C5 07 .
     - wcpm.sys
     - ^C
     A>