home *** CD-ROM | disk | FTP | other *** search
- FileMod2 byte editor by Doug Schafer '85 rewritten by J. E. Arkay 1/21/89
-
- A user-friendly utility for making quick changes to programs. It's easy to
- change messages, NOP out jumps, etc.
-
- NEVER use a byte editor on your only copy of ANYTHING !! Make a backup !!
-
- Syntax: FILEMOD2 [d:][\path\][filename.ext]
-
- You MUST give a target filename.ext on the command line.
- Run it and hit F1 for help.
- Runs on CGA or Mono screen.
-
- NIFTY USES:
- To make FORMAT from DOS 3.3 beep when finished: search for Complete, TAB over to
- the Hex field and change the very next byte to 07h (the ASCII code for beep).
- If you put 7 in the ASCII field, you'll just see 'Format Complete7'.
-
- Messages in most programs can be changed so long as you don't overwrite the $
- or 0 that signals their end. It can be very useful to change help or error
- messages, many of which are totally confusing.
-
- USER INTERFACE:
- Hopefully, most keys are shown at the bottom of the screen or obvious.
- F10 promps for new HEX record number. All numbers are HEX.
- 'Record' here means 256d bytes. If a .COM file is loaded, the first record
- is 1 so it starts at 100h; otherwise, the first record is 0.
-
- SEARCHING (F2 or CTRL-S):
- ESC or F2 exits search string entry.
- Searches go through the entire file FOLLOWING the cursor.
- Hex takes 2-character bytes separated with spaces; they can be either case.
- Case-Insens(itive) is like Exact except letter (alpha) characters match
- regardless of case. You can enter special characters like TAB or line (ALT-
- keypad) characters, too; but you can't enter the HEX PFX (default _) character.
-
- The search function is not blindingly fast: on an 8 MHz AT, it takes about
- 2 1/2 sec to search to the end of a 220K file in Exact mode, and Case-Insens
- searches are about half the speed of Exact and Hex.
-
- To to look for a hex byte in Exact or Case-Insens, preceed the byte with _.
-
- EXAMPLE: Snarf_0D_0a_00 will find 'Snarf',0Dh,0Ah,0
- In Case-Insens mode, it will also find 'sNaRf',0Dh,0Ah,0
-
- CTRL-PGUP (unlike PGUP, etc) puts the cursor in the upper left corner, so you
- can search the entire file without worrying where the cursor was.
-
-
- MOUSE:
- If you use a Mouse Systems mouse with the standard MOUSESYS driver alone,
- you will find that the left button toggles Help (F1) and the middle button
- toggles Search (F2).
-
-
- MODIFYING FM:
- If you search for SCAN CODE TABLE you can change the 21 action keys.
- The first is 42, the scan code for F8, repeat search.
- To make F3 do that, change the 42 to 3D; for ALT-R, use 13, etc.
- You can find the Auxilliary scan codes in books like Norton's Programmer's
- Guide, where they are shown (in decimal !) on p. 135.
-
- Eleven changeable defaults are in record 0002 in the form byte=FUNCTION.
- To change the color attribute for the ASCII text display, find the string
- =ASCII. The byte immediately preceding it is 3Dh (the =) and the byte before
- that (which is 07 for white on black) can be modified to change the color.
- For example, changing it to 1E will make that display yellow on blue (on a
- color monitor). The color code is standard IBM (but different from BASIC and
- ANSI.SYS):
- 0 black 4 red
- 1 blue 5 magenta
- 2 green 6 brown (yellow)
- 3 cyan 7 white
-
- The first hex digit determines the background and the second the foreground.
- Adding 8 to the foreground color produces their "intense" version; intense brown
- is yellow, intense black is gray.
- Adding 80h to the background color causes the foreground to flash. For example,
- 1E (E=6+8 Hex) is yellow on blue while 9E is flashing yellow on blue.
-
- On the Mono screen, 0 is black, 1-7 is white, but for the foreground (lo)
- nibble, 01 is Underlined.
-
- These can be modified:
-
- LINE NOS Color for line numbers; default is 04=red on black
- HEX DISPLAY Color for the HEX display; default is 06=brown on black
- HEX EDIT CRSR Color for the one changed HEX digit when editing in HEX mode
- and only one digit has been changed; default is
- F0=flashing black on white
- ASCII DISPLAY Color of the ASCII part of the display
- ACTIVE CRSR Color of the active cursor; default is 70=black on white.
- SLAVE CRSR Color of the cursor on the inactive field; default is
- 01=blue on black (shows as an underline on Mono screens)
- HELP SCREEN Color of the Help screen; default is 74=red on white
- HELP BORDER Color of the Help border; default is 1C=intense red on blue
-
- BOOT ACTIVE 00 for the ASCII field to be active when the program is
- loaded. Change it to 01 for the HEX field.
- GRAPHIC CHARS Default is 00, only text characters displayed in the ASCII
- field when the program is loaded. 01 will show all characters.
- HEX PFX The character used in an ASCII search string to preface a
- hex number. The default is _ which is ASCII 5Fh.
- To change _ to ` for example, change the 5F to 60.
-
-
- Please include the .ASM source if you post this program; someone may make
- useful changes, or even learn something.
- If you find a bug, or wish to send me lots of money, write to:
-
- J. E. Arkay
- PO Box 9747
- Baltimore, MD 21204
-