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1986-11-24
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TITLE: Patches for DOS 3.1
Patches for DOS 3.1 COMMAND.COM
-------------------------------
Patches 1 through 5 were obtained from the November 26, 185 issue of PC
Magazine. It appeared on User-to-User. The contributor of these patches is
Calvin R. Shields from Louisville, Kentucky.
Patches 6 through 12 were obtained from CompuServe. It was posted on August 9,
1985 by Jim Gainsley.
Patch 1: Fix CLS command to clear 25 lines instead of 26 lines. This
-------- particularity allows DOS to erase the first line in video
buffer which follows the currently active buffer.
debug COMMAND.COM
-e 263B
xxxx:263B 19.18
-w
-q
Patch 2: Fix the ECHO command so that ECHO followed by two spaces may
-------- be used to display a blank line. The practice of using ECHO
to generate a blank line is not supported by MicroSoft.
However, this is an undocumented feature available in earlier
DOS versions but not in DOS 3.1, and even some authors like
Peter Norton uses ECHO with two spaces to display a blank
line.
debug COMMAND.COM
-e 3878
xxxx:3878 E8.83 20.F9 00.02 74.72
-w
-q
Patch 3: Fix ECHO command so that ECHO OFF is the default for executing
-------- a BATch file. The first byte is modified to set ECHO OFF for
the processing of the AUTOEXEC.BAT file, and the second byte is
modified to set ECHO OFF for all BATch files executed from the
DOS prompt.
debug COMMAND.COM
-e 105B
xxxx:105B 03.02
-e 1967
xxxx:1967 01.00
-w
-q
Patch 4: Replace the CHDIR command, since most people use CD anyway,
-------- with a new command. The new command DATER may be used to
display the current date; unlike the DATE command, the DATER
command will not prompt you to enter a value or a carriage
return.
debug COMMAND.COM
-e 4D7D "DATER"
-e 4D82
xxxx:4D82 01.00 DB.2E 15.26
-w
-q
Patch 5: Replace the MKDIR command, since most people use MD anyway,
-------- with a new command. The new command TIMER may be used to
display the current time; unlike the TIME command, the TIMER
command will not prompt you to enter a value or a carriage
return.
debug COMMAND.COM
-e 4D8C "TIMER"
-e 4D91
xxxx:4D91 01.00 1E.DF 16.1E
-w
-q
Patch 6: Disables the printing of an automatic header for DOS FIND
-------
ren FIND.EXE FIND.TMP
debug FIND.TMP
-e 0424
xxxx:0424 03.2C
-w
-q
ren FIND.TMP FIND.EXE
Patch 7: Permit more than 10 mismatches in DOS COMP
--------
debug COMP.COM
-e 08E2
xxxx:08E2 0A.32 ;This patch allows for 50 mismatchs
-e 0BF8
xxxx:0BF8 31.35
-w
-q
Patch 8: Changing the size of the default environment.
--------
debug COMMAND.COM
-e 0D11
xxxx:0D11 0A.1E ;Set size to 544 bytes, use X'3C' for 1K bytes
-w
-q
Patch 9: Alter ANSI.SYS to disable the wait for retrace and the screen
-------- blanking.
debug ANSI.SYS
-e 02E3
xxxx:02E3 74.90 FB.90
-e 02EA
xxxx:02EA EE.90
-w
-q
Patch 10: Disables automatic creation of the .BAK files by EDLIN
---------
debug EDLIN.COM
-e 0CD5
xxxx:0CD5 56.41
-w
-q
Patch 11: Automatic installation of printer port for DOS PRINT
---------
debug PRINT.COM
-e 10CA 4 "LPT1" ;Specify the printer port you want to use
-e 1788
xxxx:1788 E8.90 CB.90 02.90
-e 179A
xxxx:179A CD.90 21.90
-w
-q
Patch 12: Changing the size of the Fixed Disk Cluster from 4K to 2K.
--------- This is a useful change if you keep many small files.
Typically, you will free up about 10% of the disk space you
are currently using.
NOTE: THE FOLLOWING PROCEDURE WILL DESTROY ALL DATA ON THE FIXED DISK!!!
You will need:
1) IBM PC DOS 3.1 (will not work with 3.0)
2) A disk utility such as DISK REPAIR (a part of the IBM
PROFESSIONAL DEBUG FACILITY) or DEBUG
The following steps must be performed to convert the cluster size from
4K to 2K without lossing your data.
1) BACKUP everything on the FIXED DISK using the DOS BACKUP command
which comes with your current version of DOS.
2) Perform a COLD boot using a DOS 3.1 system diskette in drive A, and
then run FDISK against the FIXED DISK to create and/or verify that a
DOS partition exist.
3) FORMAT the FIXED DISK using the DOS 3.1 FORMAT command. DO NOT USE
ANY PARAMETERS ON THE FORMAT COMMAND EXCEPTTHE DRIVE IDENTIFIER.
4) Using your disk utility, select the boot sector and view it. If you
are using the DOS DEBUG command, you will have to use the L command
to read the boot sector into memory, and the W command to write the
modified boot sector back to the FIXED DISK. (See below for an
explaination of the pertinent information in this sector.)
At location AA (offset X'0D') is the value for the number of sectors
per cluster. It should be X'08', this value should be changed to
X'04'.
At location BB (offset X'16') is the value for the number of sectors
per FAT. It should be X'0800', this value should be changed to
X'1500'.
The results of the above two changes should appear as in CC and DD
below.
The FIXED DISK will be reformaated to match the new description in
the boot sector in step 6.
A Layout of the Boot Sector
---------------------------
An example of the first few bytes ion the boot bector of the FIXED DISK
displayed in HEX format both before and after applying the alterations
to convert from 4K clusters to 2K clusters. (The bytes of interest are
located at boot sector offset X'0D' for sectors per cluster, and X'16'
for sectors per FAT.)
Original Boot Sector:
EB299049 424D2020 332E3100 02080100 020002F3 50F80800
^^ ^^^^
AA BB
After applying changes:
EB299049 424D2020 332E3100 02040100 020002F3 50F81500
^^ ^^^^
CC DD
Where the data elements directly above AA are sectors per cluster,
and above BB are sectors per FAT.
Modifing the Boot Secor with DEBUG
----------------------------------
If you are using the DOS DEBUG command to alter the boot sector, you
will need to use the following instructions to accomplish the task.
DEBUG
-l 0 N 0 1
-e 000D
xxxx:000D 08.04
-e 0016
xxxx:0016 08.15
-w 0 N 0 1
-q
Where N = the FIXED DISK drive as follows:
If fixed disk is drive B then N = 1
" C " N = 2
" D " N = 3
" E " N = 4
A more detailed explanation of these two changes
------------------------------------------------
The number of sectors per cluster will be changed from 08 to 04, since
that's what this is all about. The size of the FAT entries will be
changed from the 12 bit into the 16 bit format to allow DOS to address
all the additonal clusters created by this process, and the number of
sectors per FAT will be increases to accomodate both the larger size
FAT entries, and the increased number of FAT entries.
5) Exit the disk utility and perform a COLD boor with the same DOS 3.1
diskette. You must perform the COLD boot since the boot sector is
read by DOS only once, at boot time, in order to build the BIOS
Parameter Block. Having different information in the boot sector
than what's in the memory resident BPB will give unpredictable
results.
6) Reformat the FIXED DISK using the DOS 3.1 FORMAT command. Now you
may use any paramters to format the disk any way you like. The DOS
3.1 FORMAT command will not affest the changes you have made to the
boot sector. (This is not so in DOS 3.0 which will rewrite the boot
sector.)
7) Now you may RESTORE you files using the DOS RESTORE command with the
/P option. This option is required to force DOS to prompt you prior
to restoring a file. There are three files which you do not want to
have restored back onto your FIXED DISK, they are IBMBIO.COM,
IBMDOS.COM, and COMMAND.COM.
If you do allow COMMAND.COM to be restored, make sure it is a DOS 3.1
version of COMMAND.COM. Otherwise, you will have to copy in the
correct version of COMMAND.COM into you FIXED DISK.
If you allow either IBMBIO.COM or IBMDOS.COM to be restored, YOU WILL
NOT BE ABLE TO BOOT OFF YOUR FIXED DISK, EVEN IF THESE ARE DOS 3.1
SYSTEM FILES. These files wull be placed into the wrong location by
DOS RESTORE, and you will have to reformat your FIXED DISK.