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-
-
- DVDUMP
- Desqview Memory Dump
- (c) Daniel T. Travison Jr., 1987
-
- GEnie Email: D.TRAVISON
-
- Hotel Henge 518-399-3073 (8pm-12 midnight)
-
- Non-Electronic Mail:
- P.O. Box 165
- Burnt Hills, NY 12027
-
-
- You are granted permission to distribute this program with the
- stipulation that NO remittance is accepted for either the program or
- handling and distribution charges. This program may not be distributed
- with other programs on disk if a charge is incurred for any program or
- for the medium. In other words, if there is a charge involved then you
- do not have permission to include this program, period!
-
- ╒══════════════════════════════════════════════════════════════════════════╕
- │ The author makes no warranties expressed or implied as to the quality or │
- │ performance of this program. The author will not be held liable for any │
- │ direct, indirect, incidental or consequential damages resulting from │
- │ the use of this program. Your use of this program constitutes your │
- │ agreement to this disclaimer and your releasing the author from any form │
- │ of liability or litigation. │
- ╘══════════════════════════════════════════════════════════════════════════╛
-
-
-
- DVDUMP.COM is designed to allow the user to view memory in hexadecimal
- and ascii format within Desqview window. It is inspired by John
- Ferguson's Xray.com which he describes as a PC background monitor. It
- is primarily designed as a aide for debugging to be used with your
- favorite debugging tool such as DOS's Debug.com. It allows the user to
- get a 'snapshot' view of memory and when combined with Desqview's cut
- and paste features allows the user to grab snapshots of memory for
- later use in problem determination.
-
- Dvdump.com has two basic modes of operation, 'real-time' and 'freeze'.
- In the 'real-time' mode, memory is updated continuously. In 'freeze'
- mode, the program makes a call to Desqview to indicate a critical
- routine has started. You will notice that all display updating stops
- and other windows stop. At this point you may view memory at a given
- instant or mark parts of the display for later transfering into an
- editor for detailed diagnosis. I have not determined the full
- implications of this call and as a result I suggest that it be used
- sparingly since it does stop other programs and appears to lock the
- system from time to time (probally an i/o or interrupt problem). Read
- the section on the key commands for a alternate method of 'freezing' a
- program.
-
- Paging through memory is handled using segment/offset addressing. When
- the Segment address is set, the offset may be paged within the range of
- 0000h to FFFFh. Wrapping occurs at these boundries as well. A
- segment/offset address may also be inputted using the insert key. This
- will cause a 'jump' to that address and will also save the address for
- future use. This provides a convenient method for jumping directly to
- a specified address and later returning to that address.
-
- The addressable memory range is 0000:0000 to FFFF:FFFF. Dvdump.com
- does not support extended or expanded memory and has not been tested in
- the 80386 protected mode.
-
-
-
- Desqview routines used:
-
- 1: Checks for the presence of Desqview and exits with an error if
- Desqview is not found.
-
- 2: The program writes directly to the screen buffer provided by
- Desqview.
-
- 3: The program releases the rest of the time slice when ever it finishes
- a screen and also after determining that no key has been pressed.
-
- 4: 'Start Critical' and 'End Critical'. These two calls are used to
- toggle the 'freeze' option
-
- Requirements:
-
- 1: Desqview 2.0: You MUST have this version or later otherwise I can not
- guarantee the reliability of the program.
-
- 2: DVDUMP.COM: the executable program
-
- 3: DM-PIF.DVP: the program information file used by Desqview
- (see next section)
-
- 4: Reasonable compatability with the 'standard' IBM is assumed when
- running this program.
-
- Program information file:
-
- 1: I have provided the 2 screens from change a program to illustrate the
- required settings should the DM-PIF.DVP be missing or incorrect.
- Five points should be noted:
-
- 2: Memory size is set to 3k. More is not needed, less will produce an
- error message.
-
- 3: Maximum and starting screen size is set to 17 for the height and 77
- for the width. Increasing values will distort the display.
- Decreasing these values can cause serious problems when the program
- tries to write to memory that is not allocated to it.
-
- 4: All memory options on the Advanced screen are set to zero. changing
- this will only allocate memory to the program that will not be used
- and is therefore wasted.
-
- 5: The close on exit to DOS option is set to yes. This allows Desqview
- to use its own shell.com instead of command.com to load the program.
- This saves a nice chunk of memory that would otherwise be wasted. In
- addition, the escape key will close the window as well as exiting the
- program.
-
- 6: The program will appear on the Add a program (other) menu as Desqview
- Memory Dump and will have the keys DM assigned as the startup keys.
- Keep this in mind in case you have a problem finding it.
-
- 7: The program is currently set to not run in the background. You may
- want to change this if you are testing another program in a
- foreground window and wish to view both at the same time.
-
-
- ┌─────────────────────────────────────────────────────────────────────────────┐
- │ Change a Program │
- │ │
- │Program Name............: Desqview Memory Dump │
- │ │
- │Keys to Use on Open Menu: DM Memory Size (in K): 3 │
- │─────────────────────────────────────────────────────────────────────────────│
- │Program...: DVDUMP.COM │
- │ │
- │Parameters: │
- │ │
- │Directory.: C:\DV │
- │─────────────────────────────────────────────────────────────────────────────│
- │Options: │
- │ Writes directly to screen......: [N] │
- │ Displays graphics information..: [N] │
- │ Can be swapped out of memory...: [Y] │
- │ Requires floppy diskette.......: [N] │
- │ │
- │ Press F1 for advanced options Press ─┘ when you are DONE │
- └─────────────────────────────────────────────────────────────────────────────┘
-
-
- ┌─────────────────────────────────────────────────────────────────────────────┐
- │ Change a Program Advanced Options │
- │ │
- │System Memory (in K).......: 0 Maximum Program Memory Size (in K)..: │
- │ │
- │Script Buffer Size.......: 0 Maximum Expanded Memory Size (in K): │
- │ │
- │Text Pages: 1 Graphics Pages: 0 Initial Mode: Interrupts: 00 to FF │
- │─────────────────────────────────────────────────────────────────────────────│
- │Window Position: │
- │ Maximum Height: 17 Starting Height: 17 Starting Row...: 1 │
- │ Maximum Width.: 77 Starting Width.: 77 Starting Column: 1 │
- │─────────────────────────────────────────────────────────────────────────────│
- │ Shared Program │
- │Pathname..: │
- │ │
- │Data......: │
- │─────────────────────────────────────────────────────────────────────────────│
- │Options: │
- │ Close on exit to DOS.........: [Y] Uses its own colors.........: [Y] │
- │ Allow Close Window command...: [Y] Runs only in foreground.....: [Y] │
- │ Uses math coprocessor........: [N] Keyboard conflict (0-4).....: [0] │
- │ │
- │ Press F1 for standard options Press ─┘ when you are DONE │
- └─────────────────────────────────────────────────────────────────────────────┘
-
-
-
- COMMAND KEYS
-
- * Up Arrow......Decrease OFFSET by 16 bytes
- (1 line)
-
- * Down Arrow....Increase OFFSET by 16 bytes
- (1 line)
-
- * Page Up........Decrease OFFSET by 256 bytes
- (1 screen)
-
- * Page Down......Increase OFFSET by 256 bytes
- (1 screen)
-
- ^Page Up........Decrease SEGMENT address by 1000h
-
- ^Page Down......Increase SEGMENT address by 1000h
-
- Home...........Set OFFSET to 0000h
-
- ^Home...........Jump to the SEGMENT/OFFSET address
- stored by the insert option
-
- Insert.........Input a SEGMENT/OFFSET address then
- jump to that address. This address
- will also be saved for use by the
- ^Home key.
-
- F10............Toggle Freezing of all other
- windows. This should be used
- sparingly since processing in all
- other windows halts! This is only
- a 'test' option. I HIGHLY
- recommend that you manually switch
- to the window you want halted and
- press the Ctrl-Numlock key (The
- PAUSE key if your keyboard provides
- one)
-
- Escape.........Exit the program.
-
-
- * NOTE: The key commands for changing the OFFSET have no affect
- on the SEGMENT. In other words, when the OFFSET reaches
- FFFFh then it will wrap to 0000h and vise-versa.
-
-
- Compatability:
-
- This program has been successfully run on the following
- three machines:
-
- 1: Compaq 386 (CGA card, amber monitor and NOT in protected mode)
-
- 2: IBM 8mhz AT (monochrome graphics)
-
- 3: My 8mhz XT. (color) This machine is an example of the extreme in
- that the parts were purchased from at least 7 different manufactures,
- none of which are known for their large market share. The CPU is a
- NEC V20, the BIOS is by PHEONIX (version 2.26), and the operating
- system is MS DOS 3.1
-
- The End:
-
- I have written this program because I have not found a satisfactory
- alternative. I have learned a little more about assembler along the
- way and consider that sufficient compensation for the time and effort
- spent on this program. I do have an EGO so feel free to send comments
- using one of the methods provided above. Users that are in the same
- stages of learning assembler as myself may have a copy of the source as
- an example of actual uses for the routines Quarterdeck provides.
- Experienced assembler programmer's will be bored and only point out all
- the different areas where my ignorance of assembler really shines.
-
-