From: Donna L. Arellano <ecsvax!dlg%mcnc.org@relay.cs.net>
Date: 15 Apr 87 20:15:23 GMT
Subject: DOS 3.3 Patches
Organization: UNC-Chapel Hill


We've had our hands on a PS/2 model 60 for a few days now.  Wow!
Anyway, we've  found some of the  DOS 3.3 addresses  for patches
that  have been  posted in  the past  for DOS  3.2/3.1.  In  the
following list, all addresses are  for DEBUG; subtract 0100h for
the real addresses.

Here goes -->

1. Increase Environment Size:
   Not needed -> use the SHELL command in CONFIG.SYS with the /P and
                 /E parameters.


2. Automatic Installation of printer for PRINT:
   Not needed -> use the new /D parameter the first time PRINT is
                 invoked.


3. Disable EDLIN from making .BAK files:
   File=EDLIN.COM     3.1 Addr=0CD5    3.3 Addr=0CD8
                             Change 56 -> 41


4. Allow 50 mismatches in COMP before terminating:
   File=COMP.COM      3.1 Addr=08E2    3.3 Addr=0AF3
                             Change 0A -> 32
                      3.1 Addr=0BF8    3.3 Addr=0E09
                             Change 31 -> 35


5. ECHObb produces a blank line from a .BAT file:
   File=COMMAND.COM   3.1 Addr=3878    3.3 Addr=3F29
                    Change E8 20 00 74 -> 83 F9 02 72
   This allows you to put ECHO followed by two spaces in a .BAT file
   to print a blank line on the screen.


6. Default to ECHO OFF:
   File=COMMAND.COM   3.1 Addr=1967     3.3 Addr=1D68
                             Change 01 -> 00


7. Sound a BEEP at the end of a FORMAT:
   File=FORMAT.COM    3.1 Addr=152F     3.3 Addr=2185
                      Enter the following DEBUG commands:
  -D 2185 l20 <cr>
  -E 2185 "Do another  (Y/N) ?",07," " <cr>
  -D 2185 l20 <cr>
  -W
  -Q
   Be sure to include the quotes and spaces in the E command.  The 07
   does the beep.
   Below is the result of the first D command:
  xxxx:2180                 46 6F 72 6D 61 74 20 61 6E 6F 74       Format anot
  xxxx:2190  68 65 72 20 28 59 2F 4E 29 3F 00 49 6E 73 65 72  her (Y/N)?.Inser
  xxxx:21A0  74 20 44 4F 53                                   t DOS
     The 00 at 219A must not be disturbed!




Note: We use a prompt which remembers the cursor position, displays the
      date, time and  some other stuff on  line one of the  screen, and
      then goes  back where  the cursor  was and  prints C>.   After we
      changed COMMAND.COM to  default to ECHO OFF, we found  that if we
      executed  a .BAT  file that  had CLS  as its  final command,  the
      cursor remained  on line one  of the  screen.  Seems that  DOS is
      executing CLS differ-  ently than before.  Small  fix: follow the
      CLS with ECHObb in all .BAT files.  Works just fine.


Hope this comes in handy for some people.  If anyone knows of any other
patches, please post.

                     Donna Arellano
                     !(backbone)!mcnc!ecsvax!dlg
                     Univ. of North Carolina