CPUsimulatorLite

Simple CPU-simulator GUI by JAVA, Shows how Computer CPU Executes Assembly Commands, Showing the content of Main Memory, CPU Registers, CPU genral purpose registers and Stack memory every step of executing the program code

Available Commands(Assembly Instructions):

• Two operands Commands:

Inst.	Describe
ADD	add value of 2nd operand from value of 1st operand.
SUB	subtract value of 2nd operand from value of 1st operand.
MOV	transfer value from 2nd operand to 1 operand.
BNZ	if value of 2nd operand is not zero branch to location of value of 2nd operand.

• One operand Commands:

Inst.	Describe
SKZ	skip next instruction if value of the operand is zero.
INC	increment value of the opernad.
DEC	decrement value of the operand.
INP	get input value and store it to the operand.
OUT	output value of the opernad.
PUSH	push value of the opernad to the stack.
POP	pop top of stack to location of the operand.
SKIP	skip "n" of Instructios (n = value of operand).
SKIPZ	pop top of stack if equal zero skip "n" of Instructios.

• Zero operand Commands:

Inst.	Describe
NEGATE	negate the top of stack.
ADD	pop the top two elements of stack sum them then push the result.
MULTIPLY	pop the top two elements of stack multiply them then push the result.
END	gend program.

Available Addressing Modes:

Addressing Mode	Example
Immediate	#10
Memory Indirect	(10)
Register	R2
Register Indirect	(R2)

Available General Purpose Registerts:

Four Registers: R1, R2, R3, R4.

ScreenShots: