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-
- Instructions for DIS, a 68000 dissassembler
-
- Version 2.20 - 5th June 1988
- Introduction
-
- DIS is a 68000 disassembler which is distributed as 'shareware'. You
- can copy it to others freely provided that you do not modify it and
- provided that they too abide by this condition. DIS is not in the
- public domain and must not be sold for profit without the written
- permission of the author. DIS has been tested fairly well but its
- operation is not guaranteed in any way. No doubt bugs still remain and
- if you find any please let me know of them and the circumstances in
- which they occur.
-
- Operation of DIS
-
- On entry DIS displays a > prompt and awaits a command line which
- consists of a letter followed by further parameters depending on the
- command. Parameters are separated by either commas or blank spaces and
- numeric inputs and outputs are normally in hexadecimal form. In the
- following command descriptions 'x1', 'x2' etc. represent numeric number
- parameters.
-
- Command Function
-
- I x1 x2 Disassemble Instructions from x1 to x2
-
- B x1 x2 Disassemble data Bytes (8 bits) from x1 to x2
-
- W x1 x2 Disassemble data Words (16 bits) from x1 to x2
-
- L x1 x2 Disassemble Long words (32 bits) from x1 to x2
-
- C x1 x2 Disassemble in Character format from x1 to x2
-
- A x1 x2 Disassemble a table of Addresses from x1 to x2
-
- E x1 x2 Output label Equates for address ouside range x1 to x2
-
- J x1 x2 Compile labels (Jumps) from x1 to x2 into symbol table
-
- F x1 x2 xx.. Find positions of hex sequence xx.. between x1 and x2
-
- F x1 x2 "cc.." Find positions of the string "cc.." between x1 and x2
-
- U x1 x2 Set range limits for disassembly
-
- U Reset to initial range limits
-
- M x1 Enter (Make) a symbol at address x1
-
- O x1 Set an Offset value for disassembly at a different
- execution address (enter execute address or prefix
- x1 with + or - to set an actual offset value. This
- command is for use with absolute labels as results
- with relative labels can be confusing (the setting
- of an execution address (ie. O without +/-) in the
- relative label mode is not recommended. Note that
- offset = memory_position - execution_position
-
- Y x1 Set sYmbol form x1 = 0: short relative
- x1 = 1: long relative
- x1 = 2: long absolute
-
- N x1 Disassembly control -- X1 can be a sum of the values 1,
- 2, 4 and 8 to produce the desired effect as follows:
-
- x1 = 1: enter labels into the symbol table
- x1 = 2: display internal labels in output
- x1 = 4: display external labels in output
- x1 = 8: use any symbols loaded with program
-
- where internal and external labels reference addresses
- inside and outside the program area respectively. The
- program symbols will only be available if the program
- contains a symbol table.
-
- H+ H- Turn Hexadecimal code output on (+) or off (-) during
- the disassembly of instructions
-
- D+ D- Turn character code output on (+) or off (-) during the
- disassembly of instructions
-
- P program_name Load a Program for disassembly
-
- P- Unload a Program (or image file)
-
- R file_name Load (Read) a binary image file for disassembly
-
- R- Unload a binary image file (or program)
-
- S file_name Output (Save) disassembly from here onwards to a
- specified file
-
- S- Turn off saving and close output file
-
- Q Output (Query) file name and range information
-
- K Delete (Kill) all symbol table entries
-
- X Exit
-
- V Output Version/author information
-
- T Compile an auto_disassembly control Table (see later)
-
- T- Clear auto Table
-
- G Run (Go) auto disassembly (see later)
-
- When a program or image file is loaded and the relative label form
- is set (Y = 0 or Y = 1) address values are relative to the start of the
- file; when no program or file is loaded then relative labels take zero
- as a base and are therefore effectively absolute. Input values will
- either be absolute or relative depending on the value set by the Y
- command. In relative input mode an absolute number can be input by
- preceeding it with a '$' sign. If the second number of an input pair is
- preceeded by a '+' sign the value input is added to the value of the
- first parameter to form the second parameter. If a '*' is entered
- instead of an input value then the current value of the relevant
- parameter is used.
-
- Pressing the SPACE bar during disassembly will pause the output;
- pressing space again will resume output while any other key will return
- to command mode. Pressing ESC during disassembly will return
- immediately to command mode. During disassembly the x1 parameter is
- continuously updated so that a stopped disassembly can be restarted
- with using a * in the first parameter position. In number pair commands
- if no second value is given then a convenient number of lines will be
- disassembled to the screen. A RETURN entered at the > prompt will
- repeat the previous command.
-
- Automatic Disassembly
-
- The T command allows a table to be input in the following form to
- control dissassembly:
-
- L1 x1
- L2 x2
- ...
- Ln xn
-
- where Ln is one of the letters (I,B,W,L,C,A,X) and xn is a hexadecimal
- number as normal. After a table has been input a G command starts
- dissassembly. Each entry in the table is processed in turn with the
- letter determining the type of dissassembly and the address indicating
- where to start. The address for the next entry determines where
- dissassembly finishes and restarts in a new form with the last entry
- (an X) indicating the end of the process. When entering the table an
- entry can be corrected by simply entering a new entry with the same
- address value (or a Z with the same address if it is to be removed). To
- end table input simply type a RETURN in response to the prompt. The
- output can be saved if required by issuing an S command before and
- after the G command.
-
- Bug Reports and Contibutions to:
-
- Brian Gladman
- 8 College Grove
- Great Malvern
- Worcs WR14 3HP
- United Kingdom
-
-
- Revision 4 (5th June 1988)
-
- ə