YehiaShaarawy / Modified-SIC-ASSEMBLER

A modi-SIC disassembler is a program that translates machine code (HTE record) into an assembly code for the Modified Simplified Instructional Computer (modi-SIC).

Modi-SIC Disassembler

It is a program that translates machine code (HTE record) into an assembly code for the Modified Simplified Instructional Computer (modi-SIC).

Instruction Set

Instruction Format

Format 1

OPCODE (8 Bits)

Format 3

All Type 3 instruction could be immediate instructions this is done by a new division of bits of instructions of Type 3 (Format 3) as shown in following table.

OPCODE (7 Bits)	Immediate Flag [i] (1 Bit)	Indexing Flag [x] (1 Bit)	Address (15 Bits)

The modification applied on the opcode as

1. Only opcode is represented as 7 bits (not 8) as in SIC
2. The 8th bit of the opcode represents the immediate flag (i) which has two value
a. 0 if the instruction without immediate value (has an address)
b. 1 if the instruction with immediate value

Implementation

Input

It takes as an input a text file (in.txt) that contains modi-SIC machine code (modi-SIC HTE record).
Remember that The modi-SIC HTE record will be modified to accept also object code of Format 1 instruction of SIC/XE.

Output

A generated symbol table file (symbolTable.txt) for all the symbols extracted from the HTE record.

A generated assembly code file (assembly.txt) which contain three columns ordered from left as location counter, the assembly code, and object code.