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2021-04-15 13:31:59 -05:00
PD-Edit Users Guide
By Rosemary Robertson-Smith
I DISCLAIMER
Copyright (c) 1989 Rosemary Robertson-Smith
PD-Edit is Shareware. You may distribute it freely, but to use
it legally after a 10-day evaluation period you must send $15
to:
Rosemary Robertson-Smith
Ramtrack Software
72 Bowers St.
Nashua NH 03060
(603) 889-6521
In return, you will receive the latest copy of PD-Edit and a
registration number entitling you to technical support from the
author. You will also receive the next update free. Your
honesty will enable Ramtrack Software to continue distributing
quality Shareware products. All comments are welcome.
Please include a brief description of your system when you
register.
PD-Edit v1.0
II INTRODUCTION
PD-Edit is a simple screen editor, designed for use by
programmers and other users who don't want to deal with the
overhead of word processors. It is command key driven and
avoids modes of operation whenever possible.
III GETTING STARTED
PD-Edit is a binary program designed to run under the
BASIC.SYSTEM program or any other ProDOS system program that can
start a BIN program. Upon startup, it immediately requests a
file-name to edit. If no filename is entered, the program will
exit.
When running, you may type in characters just as you would any
word processor. You are only limited by the memory limitations
of the ProDOS operating system.
The binary version of PD-Edit is called PDEDIT.BIN and the
Aztec-C Shell version is call PDEDIT.PRG. You may rename the
programs to the names of your choice.
PD-Edit Page 2
IV COMMAND KEYS
Command keys are editing commands that invoke editor features.
The following describes each key:
Left-Arrow
Move left one character.
Right-Arrow
Move right one character.
Up-Arrow
Move up one line.
Down-Arrow
Move down one line.
Delete
Delete previous character.
Tab
Insert spaces to next tab stop. Tab stops are user
adjustable, but default to 4 character intervals.
Control-E
Toggle edit mode. The two modes are insert and
overstrike. The current mode is always displayed in the
status line.
Control-T
File statistics. Displays the current line number and
total number of lines, including the start and end
markers.
Control-Z
Clears buffer.
Escape
Execute special command. Special commands are:
READ [file-name]
WRITE [file-name]
EXIT
QUIT
TABS [Width from 1 to 32]
PD-Edit Page 3
Return
Start a new line.
Open-Apple-Left
Move left one tab-width.
Open-Apple-Right
Move right one tab-width.
Open-Apple-Up
Move up 16 lines.
Open-Apple-Down
Move down 16 lines.
Open-Apple-Return
Move to beginning of next line.
Open-Apple-A
Insert a special character. It requests a ASCII code to
insert at the current position. The special character
will be represented by the checkerboard character.
Open-Apple-B
Move to bottom of buffer.
Open-Apple-C
Cut selected area. PD-Edit attempts to write the
selected area to the file /RAM/PASTE.EDIT; however, if
you do not have sufficient space in the /RAM directory,
the file will be written to the current directory. This
implies that the cut lines can be repasted in another
editing session.
Open-Apple-D
Delete current line.
Open-Apple-E
Move to end of line.
Open-Apple-F
Find text. The search is case sensitive.
Open-Apple-G
Goto a line number. Line numbering begins with the
[Start of Buffer] marker.
PD-Edit Page 4
Open-Apple-I
Insert a new line after the current line.
Open-Apple-K
Start selecting lines for cut. Only whole lines may be
cut and pasted.
Open-Apple-L
Toggle macro mode. When macro mode is started, the
status line will display the word LEARN. Until the
Open-Apple-L command is pressed again, all keystrokes
are recorded.
Open-Apple-M
Execute the macro that was most recently recorded by the
Open-Apple-L command.
Open-Apple-N
Find next occurance of search string that was entered
using Open-Apple-F.
Open-Apple-P
Paste previously cut lines.
Open-Apple-R
Set a repeat count. A repeat count will cause the next
command to be repeated the specified number of times.
Open-Apple-S
Substitute for text. It will request a search string
and then a replacement string. You have the option of
replacing none, the high-lighted characters, or all
occurances of the search string. You may type in any
printable or non-printable character for the search.
Open-Apple-T
Move to the top of buffer.
Open-Apple-U
Undelete a line. Undelete only recalls the last deleted
line. Two deletes in a row will only permit the undo of
the most recent delete.
Open-Apple-W
Move the cursor forward to the first character after the
next white-space. If there are no white-space
characters on the line, the cursor will be placed at the
first non-white-space character in the next line.
PD-Edit Page 5
Open-Apple-X
Delete current character.
Open-Apple-Z
Refresh screen, placing the current line near the middle
of the screen.
V REQUESTING MORE INFORMATION
For certain commands, you will be prompted for more information.
The routine that requests the input has the following edit
features and restrictions:
o Control-Z will clear the current input buffer.
o Delete will erase the previous character.
o Escape will cancel the input and return to the editing
window.
o Cursor key movement is not supported.
o A beep will sound when you reach the maximum number of
characters or you attempt to insert an invalid
character.
o To insert non-printing characters such as a TAB or
FORMFEED, you must hold the Open-Apple key down while
pressing the desired key.
o If the input has a default value, the cursor will be
placed after the last character in the default.
VI EDITING TIPS
If your line exceeds 80 characters, an exclamation mark will
appear at the end of the line. This indicates that there are
hidden characters. You can still use all the cursor movement
and search commands; however, while accessing characters past
the 80th column in a line will keep the cursor at physical
column 80.
If you move the cursor down to a line that is actually shorter
than the previous line. The cursor will not be placed at the
end of the line; instead, it will maintain its horizontal
position. If you do not insert any characters, the original
end-of-line will not change; however, if you do insert a
character, PD-Edit will fill the line with spaces until the
end-of-line is at the current cursor position.
Tabs insert spaces and not the ASCII tab character. This costs
more memory; however, it makes your text files compatible across
PD-Edit Page 6
many platforms.
VII RUNNING PD-EDIT FROM THE BASIC SYSTEM PROGRAM
The following EXEC file should be created to properly run
PD-Edit from Apple BASIC:
BRUN EDIT -BASIC.SYSTEM
The reason for reloading BASIC after running the PD-Edit is that
some global information is overwritten by the editor. This will
prevent proper BASIC operation.
VIII EDITING AN APPLE BASIC PROGRAM
To edit an Apple BASIC program, you must first convert the
program to a text file by placing the following lines at the
beginning of the BASIC program:
1 PRINT CHR$(4);"OPEN PROGRAM.BAS"
2 PRINT CHR$(4);"WRITE PROGRAM.BAS"
3 LIST
4 PRINT CHR$(4);"CLOSE PROGRAM.BAS"
This will cause a listing of the current program to be placed in
the file "PROGRAM.BAS", which can then be edited by PD-Edit.
To convert the text program back to BASIC, issue the following
command:
EXEC PROGRAM.BAS
IX PROGRAM TAMPERING
If you suspect program tampering, or you just want to reassure
the integrity of the editor code, there is a checksum program
that can be run. Execute the following procedure:
1. Get into Apple BASIC
2. BRUN CHECKSUM
3. It will then prompt you for the editor file name. You
must provide the complete ProDOS path.
4. The program will print out 3 numbers.
5. Call the author and request a program checksum
validation. You must provide the numbers printed out by
CHECKSUM and the PD-Editor version number. The author
will confirm whether the program has been modified by an
unauthorized user.
PD-Edit Page 7
X TECHNICAL INFORMATION
PD-Edit has approximately a 17,000 character limit on the size
of a file. If you attempt to load a file that is larger than
this limit, PD-Edit will truncate it. The 17,000 value may vary
due to file attributes. A line in a file requires 9 bytes for
overhead, so the amount of memory available to the editor is
directly proportional to the number of lines in the file and
each line length.
The maximum line size is 250 characters.
The maximum file-name length is 64 characters.
The maximum repeat-count is 5000.
The maximum search/replace string is 32 characters.
The maximum tab width is 32 spaces.
The maximum length of the macro buffer is 255 characters.
PD-Edit is written using the C language and 6502 assembler.
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