The instruction set is the list of all the instructions, and all their variations, that a processor (or in the case of a virtual machine, an interpreter) can execute.
Instructions include:
CPU's vary For example, a 6502 processor has instructions liks ADC (add with carry), CMP (compare), CPX (Compare A with X) and CPY (Compare A with Y)
the correct answer is Microcode
Microcode.
Called Microcode
PROM
Unless you plan on creating a motherboard, you control it via input. (Keyboard commands or now-a-days, clicks with your mouse on basic macro-type commands through your operating system). Usually, the northbridge chip is responsible for this.
The central processing unit (CPU) is a chip built into a computer that performs basic calculations that allow the computer to run. Processing power is a measurement of how powerful this chip is, i.e. how fast it can do the required calculations.
Flash Memory
Bios
ROM is incorrect, its Flash Rom
RTC stands for Real Time Clock. The DS1302 RTC Chip is referred to as the Real Time Clock or a TimeKeeping Chip. THe DS1302 RTC Chip has a built in Trickle-Charger.
ROM