Category : Unprotects for Games and Such
Archive   : UNPROT2.ZIP
Filename : MP.DOC

 
Output of file : MP.DOC contained in archive : UNPROT2.ZIP
The following procedure can be used to unprotect MULTIPLAN ver 1.0.
The steps required can be complicated if you are not accustomed to
using DEBUG, however, if followed exactly an unprotected version can
be produced. If you prefer the process has been automated as explained
in Step 7 below.

MULTIPLAN is copy protected in two ways. First, track
11 sector 8 has been formatted as track 11 (0B) sector 61 (3D). We
will trace through the program until this sector is loaded into
memory then write it back out to disk into a file name HIDDEN.DTA.
Secondly, one sector of the file MP1 is read into memory using an
Absoulute Disk Read (DOS interupt 25H) from a specific location.
Again, we will trace through the program until that point is reached,
and write the data loaded into memory back out to disk into a file
name HIDDEN.DT2.

Using DEBUG, we will then create a short program named MPX.COM
that will take care of loading the above files into memory at
the proper time. Changes will be made to the Multiplan file MP80.COM
so it will load MPX.COM and to look for further files on the
default drive rather than Drive A:. Finally, we will make changes
to the file MP1 so that control is transfered to MPX.COM when the
hidden data is to be loaded.

The following instructions assume we are using a dual drive
PC. If you are using a hard disk, make the appropriate substitutions
(C: for B:) and skip the first step.

It is also recommended that no resident programs be loaded at
boot time prior to this procedure (such as Sidekick, etc.). The reason
being we will use a few memory locations around 64K and do not want to
overwrite DEBUG or the operating system.

1. Format a blank disk in drive B: (the \S option for system
files and single or double sided formating is optional)

2. Copy DEBUG.COM onto drive B:

3. Copy MP.UNP onto drive B:

4. Place your MULTIPLAN Ver 1.0 backup diskette in drive A: with
the write protect tab in place.

5. Set the default drive to A:

6. A> COPY MP80.COM B:
COPY MP1 B: (When the Abort, Retry, Ignore message
apprears press I for ignore)
COPY MP2 B:
COPY MPMODE.COM B:
COPY MP.SYS B:
COPY MP.HLP B: (This file is optional)

7. Issue the folowing command: A> B:DEBUG < B:MP.UNP

- OR -

You may do the same thing manually by following these
instructions:

A> B:DEBUG
-N MP80.COM 'Name of the file we are working on
-L 'Load into memory
-G 11E
-G 15b
-G 2686
-G 1799 'Trace through the program
-G 17A4
-R CX 'Change the value of the BX and CX
CX 0B3D 'registers to the number of bytes
:0200 'we wish to write to disk.
-R BX
BX 0100
:0000
-N B:HIDDEN.DTA 'Name the file
-W ES:100 'Write it to drive B:
Writing 0200 bytes
-R BX 'Change the BX and CX registers back
BX 0000 'to their original values.
:0100
-R CX
CX 0200
:0B3D
-G 17F0 'Continue tracing through the program.
-R BX
BX 660F 'If the value is different make a note
:0000 'of it to replace later.
-R CX
CX 0000 'Same holds true for CX
:0200 'Number of bytes to write
-N B:HIDDEN.DT2
-W DS:660F 'If BX was different use it here.
Writing 0200 bytes
-R BX
BX 0000
:660F 'and here!
-R CX
CX 0200 'Replace CX with its orignal value.
:0000

'Now to make changes in the file MP80.COM
'with the E for enter into memory. An xx
'represents a memory value about which we
'are not concerned. Press the space bar
'after each entry to bring up the next and
'press enter after finished. If you make an
'error simply reenter the command (i.e. E 100)
'When reviewing your entries and the values
'are correct simply press the space bar as
'it is not necessary to re-enter a correct
'value. Consult your DOS manual under DEBUG
'for a further explanation.
-N MP80.COM
-L
-E 100
xxxx:0100 BA.E9 41.3E 03.02
-E 1A2
xxxx:01A2 01.00
-E 341
xxxx:0341 xx.EB xx.09 xx.90 xx.4D xx.50 xx.58 xx.2E
xxxx:0348 xx.43 xx.4F xx.4D xx.00 xx.50 xx.53 xx.51 xx.52
xxxx:0350 xx.B8 xx.00 xx.3D xx.BA xx.44 xx.03 xx.CD xx.21
xxxx:0358 xx.8B xx.D8 xx.B4 xx.3F xx.BA xx.00 xx.C7 xx.B9
xxxx:0360 xx.00 xx.02 xx.CD xx.21 xx.5A xx.59 xx.5B xx.58
xxxx:0368 xx.BA xx.41 xx.03 xx.E9 xx.95 xx.FD xx.90
-R CX
CX 0241
:026E
-R BX
BX xxxx
:0000
-N B:MP80.COM
-W
Writing 026E bytes

'With the following entries we
will create the file MPX.COM
-N B:MPX.COM
-E 1000:0
1000:0000 xx.EB xx.0C xx.90 xx.48 xx.49 xx.44 xx.44 xx.45
1000:0000 xx.4E xx.2E xx.44 xx.54 xx.41 xx.00 xx.1E xx.B8
1000:0000 xx.00 xx.3D xx.BA xx.03 xx.C7 xx.CD xx.21 xx.BB
1000:0000 xx.00 xx.00 xx.8E xx.DB xx.8B xx.D8 xx.B4 xx.3F
1000:0000 xx.BA xx.00 xx.01 xx.B9 xx.00 xx.02 xx.CD xx.21
1000:0000 xx.B8 xx.00 xx.00 xx.BB xx.00 xx.01 xx.1F xx.E9
1000:0000 xx.7D xx.50 xx.00 xx.00 xx.EB xx.0C xx.90 xx.48
1000:0000 xx.49 xx.44 xx.44 xx.45 xx.4E xx.2E xx.44 xx.54
1000:0000 xx.32 xx.00 xx.53 xx.B8 xx.00 xx.3D xx.BA xx.37
1000:0000 xx.C7 xx.CD xx.21 xx.8B xx.D8 xx.B4 xx.3F xx.5A
1000:0000 xx.52 xx.90 xx.B9 xx.00 xx.02 xx.CD xx.21 xx.5B
1000:0000 xx.B8 xx.06 xx.F2 xx.50 xx.E9 xx.93 xx.50 xx.90
-R CX
CX xxxx
:0062
-W 1000:0
'And last of all a few changes
to MP1
-N MP1
-L
E 179F
xxxx:179F E9.E9 06.64 00.AF
E 17ED
xxxx:17ED E9.E9 04.4A 00.AF
-W
-Q

To execute MULTIPLAN type MP80 . I trust this will work
for you. Any suggestions or comments may be sent to Fred Buse
BBS # (404) 546-0583.


  3 Responses to “Category : Unprotects for Games and Such
Archive   : UNPROT2.ZIP
Filename : MP.DOC

  1. Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

  2. This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.

  3. But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/