Assembly Language 1. Describe in your own words how a multiplexer works. 2. A vi

Question

Assembly Language

1. Describe in your own words how a multiplexer works.

2. A virtual machine is an effective way of showing how each layer in a computer architecture represents an abstraction of a machine. Describe each layer of the Virtual Machine Diagram.

3. (Show your work) The following binary number is already in two’s complement notation convert the binary number 1 1 1 1 0 0 0 0 into a decimal number. (Hint: remember that two’s complement notation allows computers to represent negative values.)

4. What is the hexadecimal representation of the following binary numbers?

0 0 1 1 0 1 0 1 1 1 0 1 1 0 1 0

1 1 0 0 1 1 1 0 1 0 1 0 0 0 1 1

1 1 1 1 1 1 1 0 1 1 0 1 1 0 1 1

5. If the following two’s complement hexadecimal number F F B 3 represents an integer, what is the value of the hexadecimal number expressed in decimal (base 10) notation?

6. Describe the two steps that the “Fetch” stage does during the Instruction Execution Cycle.

7. The Operating System begins execution of a program’s first machine instruction at its __________________. The OS assigns the __________ a _________________, which is used to keep track of it while running.

8. Describe in your own words the types of modes a 32 bit x86 Processor can be in.

9. Explain how the general purpose register i.e. EAX register is broken up into.

10. Explain in your own words each level of access that Assembly Language programs have to choose from.

Explanation / Answer

1. Describe in your own words how a multiplexer works.

Answer:

The multiplexer is a combinational logic circuit designed to switch one of several input lines to a single common output line.

Multiplexing is the generic term used to describe the operation of sending one or more analogue or digital signals over a common transmission line at different times or speeds and as such, the device we use to do just that is called a Multiplexer.

The multiplexer, shortened to “MUX” or “MPX”, is a combinational logic circuit designed to switch one of several input lines through to a single common output line by the application of a control signal. Multiplexers operate like very fast acting multiple position rotary switches connecting or controlling multiple input lines called “channels” one at a time to the output.

Multiplexers, or MUX’s, can be either digital circuits made from high speed logic gates used to switch digital or binary data or they can be analogue types using transistors, MOSFET’s or relays to switch one of the voltage or current inputs through to a single output.

The most basic type of multiplexer device is that of a one-way rotary switch

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