home *** CD-ROM | disk | FTP | other *** search
-
-
-
-
-
- Ed Jordan 70357,2162
- RESDEL.EXE
- Version 4.1 - July 1988
-
- 1. tablev.exe<cr> - enter from DOS with no ram resident utilities
- 2. resdel<cr> - to get help message
- 3. resdel \r<cr> - remove all ram residents and replace vectors
- 4. resdel \n<cr> - n = 1 to 9; remove one or more utilities
-
- This program replaces earlier versions. The table fix-up routine has
- been rewritten. Some vectors were not properly located by the earlier
- versions.
-
- This program has several helpful enhancements. The program will now
- display the vector numbers which are being replaced from the backup
- copy of the table. In addition, the name of the memory resident
- program will be displayed. I have also taken the liberty of including
- a separate program in this archive which I did not write. MAP.COM is
- also on CompuServe and is in the public domain. I do not know how
- MAP.COM works. This version will allow the user to remove more than
- one utility without replacing the entire vector table. As noted below,
- there can still be problems if vectors are redirected by more than one
- utility in a cascade fashion. Be careful or you will have to use the
- red switch.
-
- To delete ram resident utilities this the program requires that an
- accurate copy of the default vector table be made as a file on the disk
- where it can be located. I wrote the program to look for this vector
- table file in the root directory of drive (A). Note: DEBUG.COM cannot
- be used to make a copy of the vector table because it redirects the
- vectors just like a memory resident utility does.
-
- The "\R" mode copies the vector table from the file (VECTOR.TBL) to the
- 1024 bytes of memory at 0:0. Then the program deallocates the
- environment blocks and program segment prefix (PSP) blocks from the end
- of DOS to the beginning of the program itself. This is all of the RAM
- residents in low memory. If a resident installs itself in high memory
- and then readjusts the size of the system memory, this program will not
- work and it will be incompatible.
-
- The "\n" (n = 1 to 9) causes successive memory blocks lower in memory
- than RESDEL.EXE itself to be removed. The program locates all of the
- blocks between the parent program (DOS) and itself by reading the chain
- of memory blocks. If there are no intervening blocks between the
- parent program and RESDEL.EXE, no action is taken. Otherwise, the next
- lower block corresponding to a PSP and its environment block, if found,
- are deleted. The vector table information present in low memory is
- searched for references to the code segment of the deallocated block.
- These vectors are replaced with the original values. In this way, the
- resident utility is effectively removed and the memory freed for
- further use. The program then recycles until the specified number
- (1-9) of utilities are removed.
-
- A brief help message is displayed if no entry is made on the command
- line or if an incorrect command is given. If "\0" is entered, only the
-
-
- -1-
-
-
- resdel.exe
-
-
- title message is displayed. No action is taken regarding the vector
- table or the utilities in low memory.
-
- GETTING STARTED:
- Boot your system from its basic configuration without any memory
- resident utilities in place. This should be the DOS itself running
- with the correct number of files and buffers and any device drivers
- that you want to have installed.
-
- Then run TABLEV.EXE from the DOS command line. This program will
- create a file called VECTOR.TBL in the current directory. Copy this
- file to the root directory of drive "A:". This is the default vector
- table that RESDEL.EXE looks for. The instructions below show how this
- default location can be changed.
-
- Once this is done, you are ready to load your memory resident utilities
- and then remove them when desired by running RESDEL.EXE from the DOS
- command line. RESDEL.EXE will not work as a child process to another
- program other than DOS itself. For example, it will not run as a child
- process under DEBUG.COM. The program thinks that the parent segment is
- DOS. It is really DEBUG instead and you will get an error message.
-
- Caution: Be very careful if the vectors are redirected more than once.
- Utilities often redirect a vector that a previously loaded utility has
- already redirected. In this situation, you will probably have to
- replace the entire vector table and start over or keep a special copy
- of the table for a particular situation. Instead of running TABLEV.EXE
- with clean memory, run it with the utility already loaded that you want
- to keep after a subsequent utility is removed. This will give the
- program the correct vector to replace when you delete a subsequent
- utility that also redirects the vector. Otherwise the program replaces
- the vector for a clean memory and the remaining memory resident utility
- then cannot function properly. You may get system lock-up. You could
- have several copies of VECTOR.TBL stored under different names and then
- copied to the name VECTOR.TBL in a batch file prior to running
- RESDEL.EXE.
-
- I will try to keep the bugs fixed if I know about them. I wrote this
- program on an IBM PC model 5150 which has a 1982 ROM upgrade and a 20
- meg. hard drive. I am including the source code with the program so
- that you may adjust the code for your particular situation if this is
- needed.
-
- A helpful program called MAP.COM (by Dorn W. Stickle) is included with
- this archive. This program will give you a memory map which will tell
- you which vectors point to which programs. Using MAP you can see the
- vectors assigned to each program as you load successive utilities.
-
- RIGHTS:
- This program is contributed to the public domain. It may be
- distributed. No charge is to be made for these programs although costs
- for magnetic media may be recuperated. No warranty expressed or
- otherwise is provided with this software. It is provided as is.
- Defects may be present which can prevent it from working on your
- particular computer.
-
-
- -2-
-
-
- resdel.exe
-
-
-
- This group of programs is included:
- TABLEV.ASM version 1a
- TABLEV.EXE
- RESDEL.DOC
- RESDEL.EXE
- RESDEL.ASM version 4.1
- PATCH.BAT
- PATCH.INS
-
- For those who do not have an assembler and want to change the default
- drive for VECTOR.TBL:
-
- ren resdel.exe resdel.123<cr>
- debug resdel.123<cr>
- ecs:06fb<cr>
- 41.43<cr> ( to make drive C )
- w<cr>
- q<cr>
- ren resdel.123 resdel.exe<cr>
-
- A short batch file which provides this patch is included in the
- archive. Enter "PATCH" to patch the program for drive C. You may edit
- PATCH.INS to change this patch for a different drive. Note: VECTOR.TBL
- can be located in a subdirectory. Supply the correct path name in the
- PATCH.INS file that is provided. The path and program name must end in
- a binary zero (asciiz format). A correct example is provided in the
- PATCH.INS file. In addition, it is possible to change the name of
- VECTOR.TBL using the same patch and supplying a different name. Be
- sure that you keep the archive file in a safe place so that you do not
- accidentally ruin the only copy of these programs that you have.
-
- To run PATCH.BAT you will need to have DEBUG.COM in your path and
- RESDEL.EXE will need to be in the current directory.
-
- TABLEV.EXE has been revised. A user of a TANDY 1000 experienced
- difficulty using the earlier version. I hope that the change has
- corrected the problem. DEBUG.COM cannot be used to make a copy of the
- vector table because it redirects vectors just like a memory resident
- utility.
-
- RESDEL.EXE ERROR MESSAGES:
-
- ** Please do not try to delete DOS
- The program has not found any memory resident utilities between itself
- in memory and the segment of its parent program. This is DOS if the
- program is run from the DOS command line.
-
- ** Unrecognized command
- There are two command line switches. "\n" and "\r" where n is a
- number between 1 and 9. See the text above.
-
- ** Insufficient memory
- The program allocates 1024 bytes to be used as a buffer to store the
- default memory table. This program should run in 64K of memory.
-
-
- -3-
-
-
- resdel.exe
-
-
-
- ** Warning: Vector not located
- Should the program try to remove a utility from memory and yet not find
- a vector in the table that points to that memory block, this message
- will be displayed. A memory block is removed but vectors have not been
- redirected. I have seen this message when a utility has redirected all
- of the vectors that a previously loaded utility had captured.
-
- ** Error freeing allocated memory block
- An error occurred when DOS tried to return a block of memory to the
- system pool.
-
- ** VECTOR.TBL not found.
- The default copy of the vector table could not be located. Run
- TABLEV.EXE from the command line with DOS in its clean configuration.
- No memory resident utilities installed. See text above.
-
- ** Warning: SHARE.EXE installed
- Do you wish to proceed? (Y/N)
- SHARE.EXE changes some of DOS below COMMAND.COM in low memory. It is
- best to reboot if you see this message. To continue may redirect
- interrupt 2F which is used by SHARE.EXE but it does not correct the
- other changes. Your system may not function correctly in this
- situation. Note: interrupt 2F is supported by DOS 3.0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- -4-
-