DISK UTILITY Version 7.5-D - For CP/M-86 ver 1.1 & CCP/M-86 ver 3.1-4.1
  Originally by Ward Christensen for CP/M-80


To invoke "DU", simply enter "DU" at the CP/M-86 prompt.

       C>DU

An initial command string may optionally be placed as an operand of
the original "DU" command, i.e.:

        C>DU M;X

for example, if you want to only map the disk, and then exit.


Once "DU" is running, it expects single-letter commands much like "DDT".
For ease of use, multiple commands may be placed on one line, separated
by "!".  In addition, a given command or string of commands may be repeated
-- either indefinitely (until ^C is pressed) or a given number of times.

To avoid an accidental ^C from dropping out of "DU", only the explicit "X"
or ESC command will exit "DU".


COMMANDS: (Numeric values 'n' are decimal, 'x' are hex)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+[n]   step in [n] sectors;
-[n]   step out [n] sectors
#      print disk parameters for curr drive.
=xxx   search for ASCII xxx from curr sector.
       Caution: upper/lower case matters.
       Use <xx> for hex:
       To find "IN AL,0C0h" use: =<E4><C0>     or
       "(tab)H,0(CR)(LF)" use: =<9>H,0<D><A>
<      save current sector into mem. buff.
>      restore saved sector
?      give help
A[ff,tt] ASCII dump
C      Change:
       CHaddr,byte,byte... (hex)
  or   CAaddr,data...  (Ascii)
       <xx> Allowed for imbedded hex.
  or   CHfrom-thru,byte  e.g. ch0-7f,e5
  or   CAfrom-thru,byte
D[ff,tt] Dump (hex+ASCII)
Fn.t   Find file
Gnn    CP/M Allocation Group nn
H[ff,tt]       hex dump
L      Log in drive
Lx     Log in drive x
M[nn]  Map [from group nn]
N      New disk
P      Toggle printer switch
Q      Quiet mode (no msgs)
R      Read current sector
Snn    Sector nn
Tnn    Track nn
Unn    Set User nn for Find command
V[nn]  View [nn] ASCII sectors
W      Write current sector
X      Exit program
Z[nn]  Sleep [nn tenths]
/[nn]  Repeat [nn (decimal) times]

Cancel a function with ESC or Ctl-C.
Suspend output with S or Ctl-S.
Separate commands with "!".
       Example: g0
       +!d!z#20!/
       would step in, dump, sleep 2 sec, 
       and repeat until control-c typed.
All "nn" usage except "/", "T", and "S" are HEX.  Use #nn for decimal.