COMP ARCH MIDTERM

Question 1

SAP 1 - sends to the memory the
address of

Answer 1

PROGRAM COUNTER

Question 2

(SAP 1)The program is stored at the beginning of the memory with the first instruction at binary address _ _ _ _

Answer 2

0 0 0 1

Question 3

(SAP 1) The program counter counts from _ _ _ _ to _ _ _ _

Answer 3

0000 to 1111

Question 4

(SAP 1)It keeps track of the next instruction to be fetched and executed.

Answer 4

PROGRAM COUNTER

Question 5

What in SAP 1 is also called a pointer

Answer 5

PROGRAM COUNTER

Question 6

(SAP 1)includes the address and data
switch registers. These switch registers, which are
part of the input unit, allow you to send 4 address
bits and 8 data bits to the RAM. Instruction and data
words are written into the RAM before a computer
run.

Answer 6

input and MAR

Question 7

MAR stands for

Answer 7

MEMORY ADDRESS REGISTER

Question 8

(SAP 1) During a computer run, the address in the program counter is latched into the __________

Answer 8

MAR

Question 9

(SAP 1)During a computer run what is latched into the MAR before applying this 4 bit address to the RAM

Answer 9

ADDRESS IN THE PROGRAM COUNTER ( 0000 - 1111 )

Question 10

THE RAM IN SAP 1 IS WHAT SIZE

Answer 10

16X 8 static TTL RAM (128bits)

Question 11

(SAP 1)-It can be programmed by means of the address and data switch registers.

Answer 11

RAM

Question 12

(SAP 1)It allows you to store a program and data in the memory before a computer run.

Answer 12

RAM

Question 13

(SAP 1) Before a computer run, the RAM receives __________from the MAR and a read operation is
performed.

Answer 13

4-bit addresses

Question 14

(SAP 1)part of the control unit.

Answer 14

INSTRUCTION REGISTER

Question 15

(SAP 1)The ________holds the instruction that has just been fetched from memory

Answer 15

INSTRUCTION REGISTER

Question 16

(SAP 1) The contents of the instruction register is split up into _________

Answer 16

2 nibbles (half byte or 4 bits)

Question 17

(SAP 1) For the instruction register, the upper nibble is a two state output that goes directly to the ________

Answer 17

“Controller-sequencer.”

Question 18

(SAP 1)For the instruction register, the lower nibble is a three state output that is ________

Answer 18

Read onto the W bus when needed.

Question 19

(SAP 1) a buffer register that
stores intermediate answers during a computer
run.

Answer 19

ACCUMULATOR

Question 20

(SAP 1)How many bits come out of the Controller-Sequencer

Answer 20

12

Question 21

(SAP 1)The 12 wires carrying the control word are
called the

Answer 21

control bus.

Question 22

(SAP 1)How many bits does the RAM connect with the W bus

Answer 22

8 bits

Question 23

(SAP 1) What are the bidirectional components of SAP 1

Answer 23

ACCUMULATOR, INSTRUCTION REGISTER

Question 24

(SAP 1) How much bits does ACCUMULATOR, ADDER/SUBTRACTOR AND B REGISTER EACH HAVE

Answer 24

8 bits

Question 25

(SAP 1)What kind of ADDER-SUBTRACTOR does SAP 1 use?

Answer 25

2's complement adder-subtractor

Question 26

(SAP 1)What Controller sequencer variable and what state does it need to be for a sum to appear in the adder-subtractor

Answer 26

Su (low)

Question 27

(SAP 1)What Controller sequencer variable and what state does it need to be for a difference to appear in the adder-subtractor

Answer 27

Su (high)

Question 28

(SAP 1) What component is asynchronous

Answer 28

Adder-Subtractor

Question 29

(SAP 1)another buffer register and is used in arithmetic operation.

Answer 29

B REGISTER

Question 30

(SAP 1)At the end of a computer run, the accumulator contains the answer to the problem being solved.

Answer 30

Output Register

Question 31

(SAP 1)a row of 8 light-emitting diodes.

Answer 31

BINARY DISPLAY

Question 32

(SAP 1) is the interface between hardware and software

Answer 32

INSTRUCTION SET

Question 33

Enumerate the control unit components of SAP 1

Answer 33

Program counter, instruction register, controller sequencer

Question 34

(SAP 1) Enumerate the 3 signals the controller sequencer emits

Answer 34

CONTROL WORD, CLEAR SIGNALS, CLOCK SIGNALS

Question 35

What provides commands to the processor, to tell it what it needs to do

Answer 35

INSTRUCTION SET

Question 36

(SAP 2) The program counter has a size of

Answer 36

16 bits

Question 37

(SAP 2) A what signal at what state resets the PC

Answer 37

CLR at LOW

Question 38

(SAP 2) The memory contains a reserved area called what and what range of addresses

Answer 38

2K ROM ranging from 0000H to 07FFH

Question 39

(SAP 2) This ROM contains a program called _________that initializes the computer on power-up, interprets the keyboard inputs, and so forth.

Answer 39

Monitor

Question 40

(SAP 2) The rest of the memory is a ______ with addresses from _____ to _________

Answer 40

62K RAM - 0800H to FFFFH

Question 41

(SAP 2) The memory data register (MDR) is an

Answer 41

8-BIT BUFFER REGISTER

Question 42

(SAP 2) The output of the Memory Data Register sets up the

Answer 42

RAM

Question 43

(SAP 2) The memory data register receives data from the bus before a ________, and it sends data to the bus after a ____________.

Answer 43

write operation, read operation

Question 44

(SAP 2) What is the size for the OPCODE

Answer 44

8 bits (instead of a nibble in sap1)

Question 45

(SAP 2) AN 8 Bit opcode can accomodate ______

Answer 45

256 instructions

Question 46

(SAP 2) The ___________produces the control words or microinstructions that coordinate and direct the rest of the computer.

Answer 46

controller-sequencer

Question 47

(SAP 2)The controller-sequencer produces the ______or ____________that coordinate and direct the rest of the computer.

Answer 47

control words , microinstructions

Question 48

(SAP 2) the __________ determines how the registers react to the next positive clock edge.

Answer 48

control word or microinstruction

Question 49

(SAP 2) For the accumulator, how many states to the ALU? To the W BUS?

Answer 49

2 state output 3 state output

Question 50

(SAP 2)Standard ALUs are commercially available as _______.

Answer 50

integrated circuits

Question 51

(SAP 2) A ___________is a flip-flop that keeps track of a changing condition during a computer run.

Answer 51

flag

Question 52

(SAP 2) ENUMERATE ALL THE REGISTERS USED

Answer 52

A, TMP, B, C

Question 53

(SAP 2) What are the constituents of the FLAG block

Answer 53

SIGN FLAG, ZERO FLAG

Question 54

(SAP 2) How many output ports

Answer 54

2