Little Man Computer emulator

Available instructions:

• IN - Input from user
• OUT - Output to user
• ADD - Add memory content to accumulator
• SUB - Subtract memory content from accumulator
• LDA - Load to accumulator content from memory
• STA - Store content from accumulator to memory
• JMP - Unconditional jump to given address
• JEZ - Jump if accumulator equals to zero
• JGZ - Jump if accumulator greater than zero
• HLT - Halt program

Example (A + B):

; A + B
IN
STA 0x0A

IN
ADD 0x0A

OUT
HLT