MARIE Assembler

Write MARIE assembly and see the two-pass assembly process: symbol table, machine code in hex & binary.

7Words

3Labels

0Errors

Source Code

Machine Code Output

Addr	Label	Opcode	Operand	Hex	Binary
000		LOAD	X	1004	0001000000000100
001		ADD	Y	3005	0011000000000101
002		STORE	Z	2006	0010000000000110
003		HALT		7000	0111000000000000
004	X	DEC	5	0005	0000000000000101
005	Y	DEC	3	0003	0000000000000011
006	Z	DEC	0	0000	0000000000000000

Symbol Table

X004

Y005

Z006

Opcode Reference

JNS0x0

LOAD0x1

STORE0x2

ADD0x3

SUBT0x4

INPUT0x5

OUTPUT0x6

HALT0x7

SKIPCOND0x8

JUMP0x9

CLEAR0xA

ADDI0xB

JUMPI0xC

LOADI0xD

STOREI0xE

About the MARIE Assembler

This assembler uses a two-pass process. Pass 1 scans the source to build a symbol table, mapping each label to its memory address. Pass 2 generates the 16-bit machine code — the top 4 bits encode the opcode, and the lower 12 bits encode the operand (memory address). Data directives (DEC and HEX) store literal values. Try editing the source or loading a preset to see how changes affect the assembled output.