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+                                      CP/M   V2.2
+                              Application Note 05, 2/20/82
+                              Improving the CTRL-S Function
+
+                          Copyright   1982 by Digital Research
+                   CP/M is a registered trademark of Digital Research.
+                     DDT and SID are trademarks of Digital Research.
+                                 Compiled November 1982
+
+          Applicable products and version numbers:  CP/M   V2.2
+
+          Program:  BDOS
+
+               The CTRL-S function controls screen scrolling during CRT output.
+          However,  the  system  does  not recognize CTRL-S if you type another
+          character before it.
+
+               In the following code segment procedures,  addresses  given  are
+          hexadecimal  offsets  from  the  base of the CP/M system.  The CCP is
+          usually located at 980H, but can be located at A00H if  a  two-sector
+          boot is used.
+
+               You can assemble the patch for your  size  memory  system.   The
+          cpmbase  equals  the BDOS entry point address at locations 6 and 7 in
+          the base page of memory minus 806H.  You must change this entry point
+          address  when you load DDT   or SID   .  Under DDT or SID, follow the
+          jump at location 5 until you find an address with a least significant
+          digit  of  6.  In the following example, the cpmbase is E506H-806H or
+          DD00H.
+
+                  0005  JMP  CD00
+                  CD00  JMP  D3A4
+                  D3A4  XTHL
+                  D3A5  SHLD E452
+                  D3A8  XTHL
+                  D3A9  JMP  E506
+
+               Patch into the SYSGEN or MOVCPM image exactly as you would patch
+          in  a  new  version of your BIOS, using the DDT i command followed by
+          the DDT r command.  Use the same offset as  your  custom  BIOS.   The
+          call at cpmbase + 950H should be cpmbase + 923H before installing the
+          following code:
+
+                  cpmbase equ     ?
+                  ;
+                  ;
+                          org     cpmbase + 950h
+                  ;
+                          call    cpmbase + 92Ah
+                          end
+
+
+                                   1
+
+
+          CP/M V2.2                                     Application Note 05
+
+
+               Or, you can install the above procedure directly into MOVCPM, if
+          MOVCPM.COM   is   on   your   system   disk.  The  patch  is  applied
+          automatically to any size system that you build using MOVCPM.
+
+               Make a back-up copy of MOVCPM.COM before using DDT to  make  the
+          following changes:
+
+
+                    A>ddt movcpm.com
+                    DDT VERS 2.2
+                    NEXT  PC
+                    2700 0100
+                    -l1350
+                    1350  CALL 0923
+                    1353  POP  B
+                    1354  PUSH B
+                    . . .
+
+                    -a1350
+                    1350 call 92a
+                    1353 .
+                    -g0
+
+                    A>save 38 movcpm1.com
+
+
+               Use the new program MOVCPM1.COM in  place  of  MOVCPM.COM.   Any
+          CP/M  system  generated  with  MOVCPM1.COM  has  the  improved CTRL-S
+          function.
+
+               Licensed  users  are  granted  the  right   to   include   these
+          modifications in CP/M V2.2 software.