MOS6502 Version 1.00
Copyright © 1997-2001 BTTR Software
[Under GNU GENERAL PUBLIC LICENSE]
| C O N T E N T S |
| 1 | INTRODUCTION |
| 2 | LICENSE & DISCLAIMER |
| 3 | SYSTEM REQUIREMENTS |
| 4 | FEATURES |
| 5 | SYNTAX |
| 6 | HISTORY |
| 7 | TECHNICAL SUPPORT & UPDATES |
| 8 | ADDITIONAL INFORMATION |
| 9 | DOWNLOAD |
| 1 | I N T R O D U C T I O N | toc |
This software called MOS6502 is a simple (non-macro) DOS-based assembly language translator (assembler) for the MOS 6502 microprocessor and its numerous clones. We tried to keep its syntax as simple as possible.
MOS6502 supports numeric constants as well as regular expressions and outputs pure binary code.
| 2 | L I C E N S E & D I S C L A I M E R | toc |
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Trademarks of companies mentioned in this software appear for identification purposes only and are the property of their respective owners.
| 3 | S Y S T E M R E Q U I R E M E N T S | toc |
- Intel i80386 microprocessor
(or compatibles)
- Microsoft DOS Version 5.00 (or higher)
Main memory requirements depend on source file size and symbol table size.
| 4 | F E A T U R E S | toc |
- supports local labels
- supports simple conditional assembling
| 5 | S Y N T A X | toc |
Keywords:
| equ | - | define
label example: label_01 equ 1234 (label_01 is now 1234) |
|||
| org | - | set
program origin example: org = 0x100 (set program origin to 0x100) |
|||
| bss | - | enter bss section (default is code section) | |||
| times | - | repeat
current statement example: times 10 db 'abcd' ('abcdabcdabcd'...) |
|||
| ifdef | - | start
conditional assembling
|
|||
| ifndef | - | start
conditional assembling
|
|||
| endif | - | mark end of conditional assembling | |||
| db | - | define
byte example: db 1, 2, 1 + 2, 3 + label_01, 10 * 4 (byte alignment) |
|||
| dw | - | define
word example: dw 1 + 2, 3 + label_01, 10 * 4 (word alignment) |
|||
| dd | - | define
dword example: dd 3 + label_01, 10 * 4, 1.234 (dword alignment) |
|||
| resb | - | reserve
byte example: resb 100 (reserve 100 bytes of uninitialized space) |
|||
| resw | - | reserve
word example: resw 100 (reserve 200 bytes of uninitialized space) |
|||
| resd | - | reserve
dword example: resd 100 (reserve 400 bytes of uninitialized space) |
Constants:
| MOS6502 supports a wide variety of numeric constants and string constants. | ||||
| Examples: | 0x12, $12, 12h | = | hexadecimal number | |
| 12 | = | decimal number | ||
| 12o, 12q | = | octal number | ||
| 1010b | = | binary number | ||
| "abc" | = | string | ||
| 'abc' | = | string | ||
Some other short examples:
| org = 0x100 | ; set program origin | |
| b equ 5678 | ; define a label, its value is 5678 | |
| OK: | ; define a label too | |
| ifdef OK | ; conditional assembling | |
| adc [(1 + b) * 2, x] | ; pre-indexed indirect | |
| times 10 dw b, 1234, 'ab', 2 * (1 + 3) | ||
| endif | ||
| bss | ; enter bss section | |
| c resw 10 | ; 20 bytes of uninitialized memory | |
| 6 | H I S T O R Y | toc |
Version 1.00 (February 06,
2001)
- first
public release
| 7 | T E C H N I C A L S U P P O R T & U P D A T E S | toc |
| Technical Support: | |
| support@bttr-software.de | |
| Updates: | |
| http://www.bttr-software.de/mos6502/ |
| 8 | A D D I T I O N A L I N F O R M A T I O N | toc |
MOS6502 was created using Aurora Editor, EDIT, Netwide Assembler/NASM and Ultimate Packer for eXecutables/UPX as well as some information from the official MOS 6502 website.
| 9 | D O W N L O A D | toc |
Binaries & Manual: mos6502b.zip
(14.1K bytes)
Source code: mos6502s.zip (10.0K bytes)
Last modified: February 06,
2001
Copyright © 1997-2001 BTTR Software.
All rights reserved.