pete@wlbr.EATON.COM (Pete Lyall) (08/18/88)
This is 'dEd'. It is a full screen disk based editor written by Doug
DeMartinis. I'm posting it here because it appears that several folks
don't have a version of 'debug' for Level II, don't have the 'Patch'
program (commercial), or any other easy means of doing disk or module
level hacks. Hopefully, this will fill the void a bit.
================================= CUT HERE ========================
#! /bin/sh
# This is a shell archive, meaning:
# 1. Remove everything above the #! /bin/sh line.
# 2. Save the resulting text in a file.
# 3. Execute the file with /bin/sh (not csh) to create the files:
# dEd.doc
# dEd.uue
# This archive created: Wed Aug 17 15:43:10 1988
export PATH; PATH=/bin:$PATH
if test -f 'dEd.doc'
then
echo shar: will not over-write existing file "'dEd.doc'"
else
cat << \SHAR_EOF > 'dEd.doc'
dEd
Disk Editor
Copyright 1987 Doug DeMartinis
dEd is a screen-oriented disk editor utility written in
assembly language. It was originally conceived as a floppy
disk editor, so the display is organized around individual
sectors. It performs most of the functions of Patch, from
Computerware, but is faster, more compact, and
screen-oriented rather than line-oriented. Individual files
or the disk itself (hard, floppy, ram) can be examined and
changed, sectors can be written to an output file, and
executable modules can be located, linked to and verified.
With simple changes, it will run on any CoCo Level I OS-9
and possibly others (CoCo Level II OS-9).
To use, type:
dEd <pathlist>
where <pathlist> is of the form: filename or dirname
or /path/filename
or /D0@ (edits entire disk)
dEd will read in and display the first 256 bytes in the file
(disk). This is Logical Sector Number (LSN) zero. You move
through the file sector (LSN) by sector using the up and
down arrow keys. The current LSN number is displayed in Hex
and Decimal in the upper left corner of the screen. If the
disk itself was accessed (by appending '@' to it's name when
dEd was called), the LSN is the disk sector number. If an
individual file is being editted, however, the LSN displayed
refers to the file, not to the disk. All numbers requested
by dEd must be in Hex format. All commands are accessed by
simply pressing the desired key.
COMMANDS
--------
Up/Down Arrows Display Next/Previous Sector (LSN)
Each keypress moves the display to the next or previous 256
bytes. Auto-repeat allows skimming quickly through the file.
To halt the key-repeat, type Control-W to pause the display,
then hit any key. The LSN displayed represents the
most-significant byte of the offset of the bytes from the
start of the file (module), so byte number $1457 would be
found in LSN $14 on row 50, column 7.
A Command APPEND Current LSN to Output File
This command writes the sector currently displayed to the
file opened with the O command. Append is inactive unless an
Output file has been created. This mode is useful for
recovering files with unreadable sectors in them, as all the
sectors before and after the crashed sector may be accessed
and saved to a new file. Append also increments the display
to the next LSN automatically to speed this process. At the
end of a file, generally fewer than 256 bytes will be
displayed, as the length of most files is not an even
multiple of 256. The Append command will only write out the
bytes that are displayed, and the display will remain on the
same LSN. Pressing 'A' twice on the last LSN of a file
results in it being written to the output file twice.
C Command CLOSE Output File
This command closes the file opened with the O command and
removes the file name from the display, making Append
inactive.
D Command Diddle with the File Length
This command displays the current file length, in Hex, then
allows you to change it. This is potentially very dangerous
(e.g. if you use it on loadable modules). If you just press
<ENTER> at the prompt, you will be returned to the command
mode (this is useful for just checking the file length). If
you enter a valid length (number of BYTES, not sectors,
in Hex), the file will be expanded or contracted to that
length. This is useful for stripping the Control-Z's ($1A)
off the end of files downloaded with the XModem protocol.
Remember, the LENGTH of a file is 1 greater than the number
of the last byte in the file.
E Command EDIT the displayed Sector
This is the heart of dEd. The cursor will appear over the
first byte or character in the LSN. If it's over the BYTE,
you can change the value by typing 2 new nibbles in Hex,
e.g. 6c. The display will be updated and the cursor will
move to the next BYTE. If the cursor is over the CHARACTER
part of the display, you can change the value by typing a
new ASCII character. Again, the display will be updated and
the cursor will shift to the next character. You switch
between the BYTE and CHAR modes at any time by hitting the
<BREAK> key, as noted at the bottom of the display. You
navigate through the sector to individual BYTEs or CHARs
using the 4 Arrow keys. The Right and Left Arrows wrap the
cursor around to the next or previous row on the display.
The Up and Down Arrows wrap around from top to bottom and
vice-versa. Once you are done Editting, pressing <ENTER>
will exit the Edit mode, as noted at the bottom of the
display. As with Zap, the sector is NOT written back to the
disk unless the Write command is then used (unless in Expert
mode).
F Command FIND
This searches the file for a given character or byte string
You will be prompted with 'Find byte string $'. Enter a
series of up to 16 Hex bytes, without spaces (you MUST
enter leading zeroes for the numbers 00 - $0F) then press
<ENTER>. The search begins at the start of the LSN
currently displayed. If a string is located that EXACTLY
matches the string you input, the LSN in which it is
located will be displayed, with the first byte/character in
the string highlighted. By pressing the <BREAK> key at the
prompt, you can toggle between the BYTE and CHARACTER
search modes. In the character mode, the prompt is 'Find
char string: '. Enter up to 16 ASCII characters, then press
<ENTER>. In this mode, dEd will locate any string that
matches the one you input, regardless of the Upper/Lower
case status of either string. As well, characters with bit
7 set (e.g. file names in directories) are treated as if
bit 7 was clear. If no matching string is found, you are
returned to the command prompt. If you enter an invalid
character or byte string, a beep sounds and the same prompt
is re-issued. If you just press <ENTER> at either prompt,
you will be returned to the command mode.
H (or '?') Command HELP
This displays a Help screen.
L Command LINK to a Module/LIST Modules
If you are editting a file that consists of various
executable modules merged together (e.g. OS9Boot), this
command allows you to 'Link' to one of the modules. It will
be treated as if it is an individual file, i.e. the start of
the module will be displayed as LSN 0 and only THAT MODULE
will be accessible for display and/or Editting. The LSN
displayed is referenced to the MODULE, not to the main file
or the disk. You will be prompted with 'Link to which
Module? '. You may enter a valid name and press <ENTER>. If
that module can be located AND if it's header information is
correct, it will be 'Linked'. The top row of the display
reflects this by displaying the module name and it's offset,
in bytes, from the beginning of the main file. At the 'Link
to which Module? ' prompt, if you just hit <ENTER>, all the
valid modules and their offsets from the beginning of the
main file as well as their lengths, in bytes Hex, will be
Listed. Hitting any key after this redisplays the current
LSN. The Link mode is useful for changing a given byte in a
module using the offset one would use for Debug. For
example, to permanently change the printer baud rate, you
would call 'dEd /D0/OS9Boot'. Then hit 'L' for Link. At the
prompt 'Link to which Module? ', Type P and hit <ENTER>. If
P is in your OS9Boot file, the top row of the display will
have MODULE: P and give the offset of it from the beginning
of the OS9Boot file. Enter the Edit mode by hitting 'E'
then use the arrows to move the cursor to byte number 27
(row 20, column 7). Type in the new value for the baud rate
then hit <ENTER> to exit Edit mode. Hit 'W' to write the
sector, then 'V' to verify the modules. If a module is
linked, the 'Find' command only searches for strings in
that module.
N Command Find Next occurrence of String
This is used in conjunction with the 'Find' command. Once a
Hex byte or ASCII character string has been located with
'F', the next occurrence may be located by pressing 'N'.
This search starts where the 'Find' search left off, IF the
LSN hasn't changed since the string was initially located.
If the LSN has changed, the search starts at the beginning
of the current LSN. If the search is successful, the string
will be highlighted, as with 'Find', otherwise you are
returned to the command prompt, with a beep.
O Command OPEN an Output File
You will be prompted with 'OUTFILE: '. Type in a file name
or path (that does not already exist) and press <ENTER>. A
new file will be created and opened, with the name
displayed on the second row of the screen. Individual
sectors can be written to this file using the Append
command.
P Command Push an LSN onto the Sector Stack
This pushes the current LSN onto a funtional Stack of
sectors. The 'R' command then can remove (pull) them from
the Stack in the reverse order (Last In, First Out) that
they were pushed. Up to 16 LSN's can be saved on the Stack.
This is very useful when trying to reconstruct a deleted
file that was fragmented on the disk. By pushing each
sector examined onto the Stack, you can retrace your steps
backwards without having to remember the sector number of
each sector along the way.
Q Command QUIT dEd
This exits dEd immediately. You should be sure to Write any
Editted or Zapped sectors back to the disk before Quitting.
R Command Remove an LSN from Sector Stack and Display
This removes (pulls), from the Sector Stack, the last LSN
that was pushed (with the 'P' command) and displays it.
S Command SKIP to a given LSN
You will be prompted with 'LSN=$ '. Type a sector number (in
Hex) and press <ENTER>. That LSN will then be displayed, if
possible. If the LSN entered is greater than the last LSN in
the file, nothing will happen.
U Command Unlink a Module
This 'unlinks' a module that has previously been 'linked'
using the 'L' command. The first sector in the file (LSN 0)
is displayed. Using this command when no module has been
linked has no effect.
V Command VERIFY All Modules
This command calculates and writes a new CRC value for EACH
module in a fale. It must be used after Editting executable
modules or they will not be loadable. Verify is terminated
if an error is located in the header of a module, but each
module is verified individually and the CRC is rewritten to
each before moving to the next module in a file, so modules
in front of one with an error will be verified.
W Command WRITE the Sector displayed to the Disk
WARNING!!! This command can be very dangerous to the well-
being of your disk data. It writes the sector displayed
back to the disk (at the same location from whence it came,
but not necessarily with the same information, hence the
danger). After Zapping or Editting a sector, you must use
this command to make the changes on the disk (unless you're
in the Expert mode). Because you can effectively maim your
data with this command, you will be prompted with 'Are you
sure (Y/N)? '. If you hit any key other than 'Y' (or 'y')
the Write command will be aborted. Otherwise the sector will
be written, with the display advising you that dEd is
'Writing Sector...'. On a hard disk or RAM disk, this is
very quick.
X Command EXPERT Mode
This command is potentially the most dangerous of all. It
should be used only by those who are very brave (fools?) or
those who never make mistakes. In this mode, any sectors
changed by Edit or Zap will be automatically written to the
disk. The Write command is not needed, and is inactivated in
the Expert mode. Any errors made during Edit or Zap WILL be
transferred to the disk, making this mode very good for
crashing directories, etc. Having noted this, there is one
route of escape from errors made in this mode. After
Editting or Zapping a sector, the sector is not actually
written back to the disk until after Edit or Zap is exitted
and the next command is issued (i.e. the next Command Key is
pressed). If you hit Shift-BREAK , before hitting any other
Command Key, the automatic Write will not occur. You must
type Shift-BREAK before any other command or the sector will
be written to the disk. This is a one-time escape, so any
further errors made will require hitting the Shift-BREAK key
again at the appropriate time to avoid writing the bad
sector to the disk. Unless you fully understand the OS-9
disk structure (or enjoy toying with the life of your data),
this mode should probably be avoided. It is entered after
responding with a 'Y' or 'y' to the 'Are you sure (Y/N)?'
prompt, and the display advises you that you are in this
mode. The 'X' command is a toggle switch, so to exit Expert
mode, just hit 'X' again and the 'Expert Mode' message will
be erased.
Z Command ZAP the displayed Sector
You will be prompted with 'Zap Byte: ' or 'Zap Char: '.
Enter either a Hex byte (e.g. 6c) or an ASCII character
(e.g. $) and press <ENTER>. That byte or character will be
written to the ENTIRE SECTOR. You can toggle between the
BYTE/CHAR modes by hitting the <BREAK> key. In the CHAR
mode, hitting ALT-Char then <ENTER> will Zap the sector with
that char with bit 7 set. Unless you're in the Expert mode,
only the buffer will be Zapped with the Zap command. To put
this Zapped sector on the disk, you must use the Write
command. If you decide not to Zap the sector, just hit
<ENTER> without first entering a byte or character. You can
redisplay a sector that has been Zapped, but not Written
back to the disk, by going to the next LSN using the Up
Arrow, then returning to the original LSN with the Down
Arrow (again, provided you're not in the Expert mode).
$ Command Fork a SHELL
A new Shell is forked to allow access to OS-9 without
terminating dEd. To return to dEd, enter Control-BREAK.
Enjoy.
Doug DeMartinis 3/86 Revised 11/87
CIS: 72245,1400
Delphi: DOUGLASD
SHAR_EOF
fi # end of overwriting check
if test -f 'dEd.uue'
then
echo shar: will not over-write existing file "'dEd.uue'"
else
cat << \SHAR_EOF > 'dEd.uue'
begin 664 dEd
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end
SHAR_EOF
fi # end of overwriting check
# End of shell archive
exit 0
================================= CUT HERE ========================
--
Pete Lyall (OS9 Users Group VP)| DELPHI: OS9UGVP | Eaton Corp.(818)-706-5693
Compuserve: 76703,4230 (OS9 Sysop) OS9 (home): (805)-985-0632 (24hr./1200 baud)
Internet: pete@wlbr.eaton.com UUCP: {scgvax,jplgodo,voder}!wlbr!pete erict@flatline.UUCP (j eric townsend) (08/21/88)
In article <22795@wlbr.EATON.COM>, pete@wlbr.EATON.COM (Pete Lyall) writes: > > This is 'dEd'. It is a full screen disk based editor written by Doug > DeMartinis. I'm posting it here because it appears that several folks > don't have a version of 'debug' for Level II, don't have the 'Patch' > program (commercial), or any other easy means of doing disk or module > level hacks. Hopefully, this will fill the void a bit. This file did not make it to Houston in one piece. If others had problems recieving it, could you (Pete Lyall) please repost it? Thanks -- "A rear engined car will *never* work!" -- from the movie "Tucker" Skate |'s || die. J. Eric Townsend ->uunet!nuchat!flatline!erict smail:511Parker#2,Hstn,Tx,77007 ..!bellcore!tness1!/