1.1 Systems architecture Lessons 4 & 5

Data and instructions in use are stored in the:

• Processor

• Embedded system

• Hard Disk Drive

• Main memory

Moore’s Law predicted…

• That the number of transistors on a circuit board would double ever year

• Computers would be capable of thinking and learning for themselves by 2020

• That the number of cores on a processor would double every year

• The performance increase of computers would eventually halt in 2020

What component holds the address of the next instruction?

• Memory Address Register

• Memory Data Register

• Program Counter

• Accumulator

Results of calculations are held in this register:

• Memory Address Register

• Memory Data Register

• Program Counter

• Accumulator

This holds the instruction/data temporarily after it is brought to the processor from the main memory.

• Memory Address Register

• Memory Data Register

• Program Counter

• Accumulator

This holds the number of the current instruction being worked on.

• Memory Address Register

• Memory Data Register

• Program Counter

• Accumulator

This would perform an operation including the word “And”

• Arithmetic Logic Unit

• Accumulator

• Cache

• Control Unit

This would send a signal such as “Memory Read”

• Arithmetic Logic Unit

• Accumulator

• Cache

• Control Unit

This would reduce the number of memory/processor transfers

• Arithmetic Logic Unit

• Accumulator

• Cache

• Control Unit

This sends signals such as “I/O Read”

• Arithmetic Logic Unit

• Accumulator

• Cache

• Control Unit