19. Embedded systems can be found in simple items like coffeemakers and tennis shoes. T/F 20. General-purpose computers do not need watchdog timers because they interact directly with human beings. T/F 21. An operating system that is widely used in embedded systems is MS-DOS. T/F 22. Embedded systems rarely use virtual memory. T/F 23. A single embedded system cannot contain random access memory RAM, ROM, and flash memory. T/F 24. PLD means A) Programmable logic display B) Programmable logic device C) Programmers logie device D) Programmable language device 25. The embedded systems programmer typically writes programs excl and does not have the luxury of after-the-fact performance tuning. A) Assembly language B) High level language C) Code language D) Binary language 26. POSIX means A) Porst Operating System Interface B) Preventive Operating System Interface C) Portable Operating System Integrator D) Portable Operating System Interface 27 are distinguished from microcontrollers by their complexity and increased on-chip resources. A) Systems on a chip B) Systems on a drive C) Chip on a chip D) Device on a chip