A fast-food restaurant has four kinds of employees:
(1) order takers, who take custom- ers’ orders;
(2) cooks, who prepare the food;
(3) packaging specialists, who stuff the food into bags; and
(4) cashiers, who give the bags to customers and take their money.
Each employee can be regarded as a communicating sequential process.
What form of interprocess communication do they use?
Relate this model to processes in UNIX.

Write a new lc-3 trap subroutine (i. e. a subroutine that will be invoked via the trap instruction) that will receive a numeric digit entered at the keyboard (i. e. an ascii character), echo it to the screen, and return in r0 the corresponding numeric value: so if the user types the digit '7', the character '7' will appear on the screen, but the value returned in r0 will be b0000 0000 0000 0111 (#7) you may not use any trap calls in your code - you must implement the "polling" code that interrogates the keyboard status and data registers. ; getnum_tsr ; a subroutine for obtaining a numeric value ; given ascii numeric digit input to keyboard. ; the numeric digit is echoed to the console (e. g. '7' = b0000 0000 0011 0111), ; but the value returned in r0 is the actual numeric value ; corresponding to the digit (e. g. b0000 0000 0000 0111 =