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EnigmA Amiga Run 1997 July
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EnigmA AMIGA RUN 20 (1997)(G.R. Edizioni)(IT)[!][issue 1997-07 & 08][EAR-CD IV].iso
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ASA Manual
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1996-03-10
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ASA - A Simple Assembler
by S.Goodwin
Copyright 1994-6
Abstract
This is a simple cross-assembler for creating code to work with the
6809 Emulator, whilst running under the Amiga's CLI or shell. It can
produce code (with or without headers) and a symbol file.
-- Usage --
First, you must write your assembler code into a plain ASCII text
file. Then type 'asa file_name', where 'file_name' is the file name of
your assembler code. This will then output:
ASA - A Simple Assembler - Copyright Steven Goodwin 1994-6
Pass 1
Pass 2
Saving Code
Saving symbols table
The code will be saved into a file of the same name, but with an
'.6809' extension. When loaded into the emulator, this assembler code
will be placed (by default) at 20000 ($4e20).
The symbols file will have the '.sym' extension, and can be loaded
through the symbols requester.
To get a full list of options available just type 'asa' on its own:
ASA - A Simple Assembler - Copyright Steven Goodwin 1994-6
asa [-cFILE] [-oNUM -bNUM -hC -sFILE -xC] filename <dest_fname>
Use "asa help" for a full description...
Using 'asa help', we get:
ASA - A Simple Assembler - Copyright Steven Goodwin 1994-6
asa [-cFILE] [-oNUM -bNUM -hC -sFILE -xC] filename <dest_fname>
-cFILENAME Uses a particular configuration file.
-oNUMBER Specifies the origin of the assembled machine code.
-sFILENAME Save out symbol table with name.
-bNUMBER Sets a buffer size for the machine code produced.
-h(y or n) Include an assembler header.
-x(y or n) Remove original extension on source name?
If the filename starts 'file.' the source file is used, with the
appropriate extension. The word 'screen' sends it to the terminal,
and 'none' disables the option.
-- Features --
o Free format assembly text (i.e. include spaces/tabs in most places
and the system will *not* complain at you)
o Entire (??) instruction set has been implemented.
o Hard-wired lexical analyser and parser. Whew! That took some
patience! But as a consequence it should be *very* fast.
o Works with full implementations of,
FCC - allows text (within quotes) and byte data
FCB - store data bytes into memory
FDB - store words in memory
RMB - leaves a gap of x bytes
o Label referencing forwards/backwards for all instructions.
o Saves in either 'memory block' or 'assembler snapshot' format. The
latter containing a header indicatings its origin.
o Can use configuration files to specify set-up.
Non-Features (i.e. those I should have coded, but didn't!)
o The EQU op-code will only produce output in the symbols file. The
symbols themselves can not be used within the assembler file itself.
o No ORG op-code. Won't be implemented for a while, due to the file
format.
o Poor error handling.
o PC relative addressing with LEA is not featured.
- Creation -
This was created (primarily) to allow me to write and test routines
for the 6809 emulator. However, it was deemed to be of use, and so was
released with it. No guarantees are made for either piece of software,
particularly as 99% of it was reverse engineered from code examples
from books, magazines and my own personal collection. (apologies to
.Kinn for losing your files :( )
ASA was compiled by Philip Hart on SAS/C v 6.
-- Copyright Notice --
The 'ASA' assembler is part of the 6809e emulation system, comprising
of the assembler and emulator. The 'software' incorporates both parts
of the system.
This software, and all its associated documents, is copyright 1996 by
Steven Goodwin. The version provided here may be freely distributed as
long as no files are edited or deleted, and the copyright notice
contained herein is not modified. No warranties, implied or otherwise,
are given and this software is used at the users own risk, and no
liability can be accepted for any damaged caused, either directly or
indirectly, from this software.