MARIE Simulator

Execute MARIE programs step-by-step, inspect registers, memory, and output in real time.

Speed

Ready

Input

Registers

PCProgram Counter000

MARMem Addr Reg000

MBRMem Buffer Reg0000

IRInstruction Reg0000

ACAccumulator0000

Output (0)

No output yet.

Memory

Addr	Label	Hex	Source
000		1004	LOAD X
001		3005	ADD Y
002		2006	STORE Z
003		7000	HALT
004	X	0005	X, DEC 5
005	Y	0003	Y, DEC 3
006	Z	0000	Z, DEC 0

Execution Log (0 steps)

Click Step or Auto to begin execution.

Source Code (edit & reset to re-assemble)

About the Simulator

The simulator uses the MARIE engine to execute your assembled program. Press Step to execute one instruction, Auto to step continuously (adjust speed with the slider), or Run All to execute to completion instantly. Registers that changed on the last step are highlighted green. The execution log shows every instruction executed with its effect.