TWO PASS ASSEMBLER- 8086

This is an implementation of a two-pass assembler for Intel 8086 Microprocessor . It builds the Symbol Table and Assembler Listing for a .asm file of an assembly program.

Getting Started

Follow these instructions to run the software:

1. Add your .asm program file in the folder named docs.
   
   

2. Open assembler8086.jar.
   

3. Enter the name of your file. (eg. swap.asm)
   (You can use the filename of files already present in docs folder)
   

4. Click on START.

5. If there are no errors, click on SHOW SYMBOL TABLE or SHOW ASSEMBLER LISTING.
   

The symbol table gets displayed.

The assembler listing gets displayed.

6. Click on LOAD ANOTHER FILE to build symbol table and assembler listing for another file.

To view source code, open folder src/java.
It contains 8 files:

1. Main.java
2. Pass1.java
3. Pass2.java
4. AddressingModesHelper.java
5. AssemblerDirectiveTable.java
6. MachineInstructionTable.java
7. SymbolTable.java
8. AssemblerListing.java

Prerequisites

- JAVA	Runtime	Environment

Supported Instructions

Programs that include one or more of the following instructions are supported.

- MOV    
- LDS  
- LEA  
- LES  
- XCHG  
- ADD
- ADC
- SUB
- SBB
- CMP
- INC
- DEC
- MUL
- IMUL
- DIV
- IDIV
- DAA
- DAS

Supported Directives

Programs that include one or more of the following directives are supported.

- DB
- DW
- DD
- ASSUME
- END
- ENDS
- SEGMENT
- HLT

Supported Addressing Modes

Programs that include one or more of the following addressing modes are supported.

- Immediate               - (eg. ADD AX, #100H)
- Direct                  - (eg. MOV AX, num)
- Register                - (eg. ADD BX, AX)  
- Register Indirect       - (eg. MOV AX, [BX])
- Register Relative       - (eg. ADD AX, [BX + SI])
- Based Indexed           - (eg. MOV AX, [BX + 7])
- Relative Based Indexed  - (eg. ADD AX, [BX + SI + 7])

Note: Immediate value is preceded by '#'. It ends with 'D', 'H' or 'B' for decimal, hexadecimal or binary values respectively.