Microprocessors Interview Questions - An interviewhelper.org blog

TestKing.com is merging with several local businesses that use routers from

2009-04-27T00:23:00.019-07:00

Question :TestKing.com is merging with several local businesses that use routers from
multiple vendors. Which routing protocol would work best to connect TestKing.com
with the enterprise networks it has acquired by providing scalability and VLSM
support while minimizing network overhead?
A. IGRP
B. EIGRP
C. OSPF
D. RIP v2
E. RIP v1

Answer :C
Explanation:
RIP (both version 1 and version 2) is standards based, providing inter-operability support
between vendors. RIPv2 is an enhancement to the first version and contains the following
enhancements:
1. Support for variable length subnet masks (VLSM) (Because of this, RIP doesn't assume
that all networks are classful.)
2. Multicast routing updates
3. Authentication with an encrypted password for routing updates
Incorrect Answers:
A, B: IGRP and EIGRP are Cisco proprietary routing protocols that are not supported by
other vendors.
C: OSPF is a CPU-intensive protocol, and very large OSPF networks can experience
routing and update traffic problems that seriously impact network performance. In
addition, routers in large OSPF networks require large amounts of memory.
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E: RIPv1 does not support VLSM.
Section 4: Design a simple internetwork using Cisco technology
(19 questions)

Which routing protocols can be used within the enterprise network shown in the

2009-04-27T00:23:00.018-07:00

Question :-Which routing protocols can be used within the enterprise network shown in the
diagram? (Choose three.)
A. RIP v1
B. RIP v2
C. IGRP
D. OSPF
E. BGP
F. EIGRP
Answer :-B, D, F
Explanation:
In this network there are IP subnets which use variable length subnet masks. RIP V2,
OSPF and EIGRP are the interior routing protocols that support VLSM.

RIP version 2 is being used as the routing protocol within the TestKing network.

2009-04-27T00:23:00.017-07:00

Question :RIP version 2 is being used as the routing protocol within the TestKing network.
What does RIP version 2 use to prevent routing loops? (Choose two)
A. CIDR
B. Split horizon
C. Authentication
D. Classless masking
E. Hold-down timers
F. Multicast routing updates
G. Path Vectoring

Answer :B, E
Explanation:
Distance Vector routing protocols employ the split horizon mechanism to reduce the
possibility of routing loops. Split horizon blocks information about routes from being
advertised by a router out of any interface from which that information originated.
RIP versions 1 and 2 also use the concept of hold timers. When a destination has become
unreachable (or the metric has increased enough to cause poisoning), the destination goes
into "holddown". During this state, no new path will be accepted for the same destination
for this amount of time. The hold time indicates how long this state should last.
Incorrect Answers:
A, C, D, F. Although these are all features and functions of RIP version 2, they are not
mechanisms used to prevent routing loops.
G. Path Vectoring is a concept used by BGP routers. RIP version 1 and 2 are considered
to be distance vector routing protocols.
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What is the purpose of the OSPF router ID in a DR/BDR election?

2009-04-27T00:23:00.016-07:00

Question :What is the purpose of the OSPF router ID in a DR/BDR election?
A. It is used with the OSPF priority values to determine which OSPF router will become
the DR or BDR in a point-to-point network
B. It is used with the OSPF priority values to determine which interface will be used to
form a neighbor relationship with another OSPF router
C. It is used with the OSPF priority values to determine which router will become the DR
or BDR in a multi access network
D. It is used to determine which interfaces will send Hello packets to neighboring OSPF
routers

Answer :C
Explanation:
The router ID is the highest IP address or the highest IP address among loopback
addresses (if one is configured) on the Cisco router or can be configured manually by
"router-id x.x.x.x". Once the router ID is chosen, it will not be changed unless the OSPF
process is reset(clear ip ospf process xx) or the router is reloaded. The IP address of
router ID doesn't need to be reachable, but it is used to determine which will router will
become the DR or BDR in a multi-access network.

Which one of the following routing protocols would be the best choice?

2009-04-27T00:23:00.015-07:00

Question :Which one of the following routing protocols would be the best choice?
A. RIPv1
B. RIPv2
C. IGRP
D. OSPF
E. EIGRP
Answer :E
Explanation:
EIGRP would be the best choice as it provides support for VLSM and CIDR, has faster
convergence times than other protocols, is scalable, and supports IP, IPX, and Appletalk.
EIGRP is a Cisco proprietary routing protocol, so it will not work with other vendors.
However, the requirements of the question made no mention of the use of non-Cisco
routers, so it will not be an issue in this case.
Incorrect Answers:
A, C: Both of these routing protocols do not support VLSM.
B. While RIPv2 supports VLSM, it provides no support for IPX. The IPX RIP protocol is
similar in function to RIP version 1. Both versions of RIP also consume more bandwidth
than EIGRP.
D. OSPF does not support IPX.

Which of the following routing protocols will support this IP addressing scheme

2009-04-27T00:23:00.014-07:00

Question :Which of the following routing protocols will support this IP addressing scheme?
(Choose all that apply).
A. RIP version 1
B. RIP version 2
C. IGRP
D. EIGRP
E. OSPF
F. BGP

Answer :B, D, E
Explanation:
Because this network is using IP subnets with variable length subnet masks, only routing
protocols that support VLSM will fit this particular case. The routing protocols that
support VLSM are RIP v2, EIGRP and OSPF.
Incorrect Answers:
A, C: RIP version 1 and IGRP do not support VLSM information within the routing
updates.
F. BGP is used for inter-AS routing, such as the Internet. It is not normally used as an
Interior routing protocol.

Which of the routing protocols shown below support both VLSM and route

2009-04-27T00:23:00.013-07:00

Question :-Which of the routing protocols shown below support both VLSM and route
summarization? (Select three)
A. IGRP
B. EIGRP
C. RIP v1
D. RIP v2
E. OSPF
F. VTP
G. CDP
Answer :-B, D, E
Explanation:
EIGRP and OSPF support Variable Length Subnet Masks (VLSM) and provide for both
automatic and manual route summarization configurations. RIPv2 is an enhanced version
of RIP, and overcame some of the limitations of RIP by introducing support for VLSM.
Incorrect Answers:
A, C: IGRP and RIP are relatively old and simplistic routing protocols that were
developed before the concepts of VLSM and route summarization.
F. VTP is the VLAN Trunking Protocol, used in switched LAN environments to carry
VLAN information. It is not a routing protocol.
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G. CDP is the Cisco Discovery Protocol, used between neighboring Cisco devices to
automatically discover information. It is not a routing protocol.

TestKing has four offices, each with its own network, as shown in the graphic.

2009-04-27T00:23:00.012-07:00

Question :-TestKing has four offices, each with its own network, as shown in the graphic.
Three of the networks have approximately 50 hosts each, and one network has 10
hosts. The multi-vendor routers are connected by serial links that use separate
subnetwork numbers. The TestKing network has leased one Class C address to be
used for all networks and serial links, and they do not wish to replace any of their
existing routers.
Which routing protocol would be most appropriate for this scenario?
A. TCP/IP
B. RIP version 1
C. RIP version 2
D. IGRP
E. EIGRP
F. All of the above are acceptable
Answer :-C
Explanation:
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The question describes 2 important requirements. The first is the fact that a routing
protocol that supports VLSM is needed, as specified by the fact that one class C address
range is to be used for all networks. The second important requirement is that routers
from multiple vendors are being used, so the routing protocol chosen must be
non-proprietary. RIP version 2 is a standards based routing protocol that supports variable
length subnet masking (VLSM). Note that OSPF would also be a viable choice, but it was
not one of the answer choices.
Incorrect Answers:
A. This is not a routing protocol.
B. RIP version 1 does not support VLSM
D, E: Although these both support VLSM, IGRP and EIGRP are Cisco proprietary
routing protocols which are not supported by other router vendors.

Which of the following routing protocol would best serve your needs?

2009-04-27T00:23:00.011-07:00

Question :Which of the following routing protocol would best serve your needs?
A. VTP
B. RIP version 1
C. EIGRP
D. OSPF
E. IGRP
F. CDP

Answer :D
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Explanation:
Since one of the requirements is that the routing protocol must support other vendors, our
only choices are RIP and OSPF. Since RIP version 1 does not support VLSM, OSPF is
the only choice.
Incorrect Answers:
A. VTP is the VLAN Trunking Protocol. This is not a routing protocol.
B. RIP version one does not support VLSM. Note that RIPv2 does support VLSM, and
would be a valid choice.
C, E: EIGRP and IGRP are Cisco proprietary routing protocols, and are not supported by
other vendors.
F. CDP is the Cisco Discovery Protocol, which is used to exchange information between
Cisco devices. It can only be used between Cisco routers and switches, and it is not a
routing protocol.

Which of the following routing protocols support the use of VLSM (Variable Length

2009-04-27T00:23:00.010-07:00

Question :Which of the following routing protocols support the use of VLSM (Variable Length
Subnet Masking)? (Select three)
A. RIPv1
B. EIGRP
C. OSPF
D. IGRP
E. RIPv2

Answer :B, C, E
Explanation:
Static routing, OSPF, IS-IS, EIGRP, BGP, and RIP version 2 all support VLSM.
Incorrect Answers:
A, D: RIPv1 and IGRP do not support VLSM.
Reference: Sybex CCNA Study Guide edition 4, Page 123

In this diagram, OSPF is used as the routing protocol between the corporate office

2009-04-27T00:23:00.009-07:00

Question :In this diagram, OSPF is used as the routing protocol between the corporate office
and the offices on the left side of the diagram. An ISDN link provides connectivity
from the central corporate router to the remote sales office on the right side of the
diagram. Which type of route should the corporate office use to reach the router on
the right side of the diagram if the overhead on the ISDN link is to be kept to a
minimum?
A. A RIP route
B. An OSPF route
C. A static route
D. A default route
E. A dynamic route
F. None of the above
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Answer :C
Explanation:
A static route uses the least amount of overhead because no routing protocol information
will be exchanged over the ISDN link. As long as the ISDN link is up, the static route
will always remain in the routing table of the corporate router.
Incorrect Answers:
A. This will not only provide additional overhead on the ISDN link as the RIP
information is passed from one side to the other, but it will add additional overhead and
complexity to the corporate router because now two routing protocols will need to be
running. With this choice, RIP and OSPF will need to be configured on the corporate
router.
B. This will add the overhead of LSP information being passed between the two routers
over the ISDN link.
D. Although a default route can be a type of static route, in this case a default route will
be a poor choice because then traffic destined to the Internet will go to remote office on
the right side, instead of towards the ISP on the left.
E. All dynamic routing protocols will add some level of overhead. Static routes will not
increase the traffic level at all over the ISDN link.

Which of the following routing protocols do NOT support VLSM (variable length

2009-04-27T00:23:00.008-07:00

Question :Which of the following routing protocols do NOT support VLSM (variable length
subnet masking)? (Choose all that apply).
A. RIPv1
B. IGRP
C. EIGRP
D. OSPF
E. IS-IS
F. RIPv2

Answer :A, B
Explanation:
RIP version 1 and IGRP are classful IP routing protocols. They do not support variable
length subnet masks.
Incorrect Answers:
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C, D, E, F. Static routing, OSPF, IS-IS, EIGRP, BGP, and RIP version 2 all support
VLSM.

You need to choose a routing protocol for a new TestKing network. This network

2009-04-27T00:23:00.007-07:00

Question :You need to choose a routing protocol for a new TestKing network. This network
will be running IP, IPX, and Appletalk, and you wish to utilize only one routing
protocol. Which one would be the best choice?
A. OSPF
B. EIGRP
C. RIP v2
D. IGRP
E. RIP v1

Answer :B
Explanation:
Only EIGRP provides routing protocol support for IP, IPX, and Appletalk networks.

You need to configure a single router into load balancing traffic across 4 unequal

2009-04-27T00:23:00.006-07:00

Question :You need to configure a single router into load balancing traffic across 4 unequal
cost paths. Which routing protocols can satisfy this requirement? (Select two)
A. RIP v1
B. RIP v2
C. IGRP
D. EIGRP
E. OSPF
F. IS-IS

Answer :C, D
Explanation:
In general, load balancing is the capability of a router to distribute traffic over all its
network ports that are the same distance from the destination address. Load balancing
increases the utilization of network segments, thus increasing effective network
bandwidth. There are two types of load balancing: equal cost path and unequal cost path.
Every routing protocol supports equal cost path load balancing. In addition to that, IGRP
and EIGRP also support unequal cost path load balancing, which is known as variance.
The variance command instructs the router to include routes with a metric less than n
times the minimum metric route for that destination, where n is the number specified by
the variance command. The variable n can take a value between 1 and 128, with the
default being 1, which means equal cost load balancing (variance for example. Traffic
is also distributed proportionally among unequal cost links, with respect to the metric.
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When designing OSPF networks; what is the purpose of using a hierarchical

2009-04-27T00:23:00.005-07:00

Question :-When designing OSPF networks; what is the purpose of using a hierarchical
design? (Select all choices that apply)
A. To reduce the complexity of router configuration
B. To speed up convergence
C. To confine network instability to single areas of the network
D. To reduce routing overhead
E. To lower costs by replacing routers
F. To decrease latency
Answer :-B, C, D
Explanation:
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An OSPF network designed in a hierarchical fashion with different areas is used because
a small change in the topology of a single area won't force every router to run the SPF
algorithm. Changes in one area are limited to that area only, not to every router within the
entire network. Confining the topology changes to one area reduces the overhead and
speeds the convergence of the network.
Reference: CCNA Self-Study CCNA ICND exam certification Guide (Cisco Press, ISBN
1-58720-083-X) Page 194
Incorrect Answers:
A. This choice is incorrect because a hierarchical design actually adds complexity to the
router configuration.
E. This is incorrect because a hierarchical design will not eliminate the need for routers.
In fact, segmenting the network into multiple areas may actually require the use of
additional routers.
F. The use of a hierarchical design will in no way reduce the latency involved. If
additional routers are implemented in order to segment the network into additional areas,
then the latency involved may actually increase.

The network with the IP address 172.31.0.0/19 is to be configured on the TestKing

2009-04-27T00:23:00.004-07:00

Question :-The network with the IP address 172.31.0.0/19 is to be configured on the TestKing
router with the partial configuration shown in the graphic. Which of the following
statements describes the number of available subnets and hosts that will result from
this configuration?
Exhibit:
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A. There are 7 usable subnets, with 2046 usable host addresses.
B. There are 8 usable subnets, with 30 usable host addresses.
C. There are 7 usable subnets, with 30 usable host addresses.
D. There are 8 usable subnets, with 2046 usable host addresses.
E. There are 7 usable subnets, with 8190 usable host addresses.
F. There are 8 usable subnets, with 8190 usable host addresses.
Answer :-F
Explanation:
The 172.31.0.0/19 will have 3 bits in the network portion, and 13 bits in the host portion.
This will allow for 2^3 = 8 networks and 2^13 = 8192 hosts available for each network
(8190 usable). Since the IP subnet-zero command is used the first network is available,
making choice F correct.

The TestKing network administrator has designed the IP scheme as shown in the

2009-04-27T00:23:00.003-07:00

Question :-The TestKing network administrator has designed the IP scheme as shown in the
diagram below. What effect will this addressing scheme have on the network?
Exhibit:
A. IP traffic between subnet A and B will be prevented.
B. Routing information will not be exchanged.
C. The addressing scheme will allow all IP traffic between the LANs.
D. IP traffic between all the LANs will be prevented.
Answer :-C
Explanation:
This scheme will allow for communication between all networks, and uses all IP
addresses in the 192.168.1.0/24 IP network with no overlap. Note that RIPv2 is being
used instead of RIPv1. RIPv2 carries subnet mask information allowing for VLSM
networks like the one shown here.

In the TestKing network shown below, which subnet address could a network

2009-04-27T00:23:00.002-07:00

Question :-In the TestKing network shown below, which subnet address could a network
administrator use for Network A on the left?
Exhibit:
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A. 192.168.35.64/26
B. 192.168.35.32/27
C. 192.168.35.128/26
D. 192.168.35.192/27
E. 192.168.35.96/27
Answer :-C
Explanation:
In order to support 62 hosts, a /26 will be needed, leaving only options A and C. The IP
network in option A will conflict with the 192.168.35.64/28 that is already in use, leaving
only choice C as the correct answer.
Incorrect Answers:
A: This will conflict with a network that is already in use, causing there to be duplicate IP
addresses assigned in the network.
B, D, E: A /27 will only support 30 hosts.
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A new subnet with 12 hosts in the TestKing network has been added. Which subnet

2009-04-27T00:23:00.001-07:00

Question :-A new subnet with 12 hosts in the TestKing network has been added. Which subnet
address should this network use to provide enough useable addresses while wasting
the fewest addresses?
Exhibit:
A. 192.168.10.80/29
B. 192.168.10.96/28
C. 192.168.10.80/28
D. 192.168.10.96/29
Answer :-B
Explanation:
A /29 subnet mask will only support 6 IP hosts. A subnet mask of 255.255.255.240 (/28)
will support up to 14 hosts, leaving only options B and C as viable. Option C will overlap
with the existing 192.168.10.64/27 network, which will cause duplicate IP addresses to be
assigned in the network.

A new subnet with 60 hosts has been added to the TestKing network shown below.

2009-04-27T00:23:00.000-07:00

Question :-A new subnet with 60 hosts has been added to the TestKing network shown below.
Which subnet address should this network use to provide enough usable addresses
while wasting the fewest addresses?
Exhibit:
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A. 192.168.1.56/27
B. 192.168.1.64/26
C. 192.168.1.56/26
D. 192.168.1.64/27
Answer :-B
Explanation:
A subnet mask of 255.255.255.192 (/26) will be needed to support 60 hosts. Option B
will allow for this number of hosts, and the next available IP subnet in the 192.168.1.0
subnet that is not already used in the network is 192.168.1.64.
Incorrect Answers:
A, D: A /27 subnet mask will only support up to 30 hosts.
C: This network will conflict with the 192.168.1.48/28 network that is already in use, as
the range of IP addresses used in this network is 192.168.1.48-192.168.1.63.

What is the difference between 8086 and 8088

2009-04-27T00:21:00.002-07:00

Question :-What is the difference between 8086 and 8088?
Answer :-The BIU in 8088 is 8-bit data bus & 16- bit in 8086.Instruction queue is 4 byte long in 8088and 6 byte in 8086.

Which microprocessor accepts the program written for 8086 without any changes

2009-04-27T00:21:00.001-07:00

Question :-Which microprocessor accepts the program written for 8086 without any changes?
Answer :-
8088 is that processor.

What does EU do

2009-04-27T00:20:00.000-07:00

Question :-What does EU do?
Answer :-Execution Unit receives program instruction codes and data from BIU, executes these instructions and store the result in general registers.

Which Flags can be set or reset by the programmer and also used to control the operation of the processor

2009-04-27T00:18:00.000-07:00

Question :-Which Flags can be set or reset by the programmer and also used to control the operation of the processor?
Answer :-Trace Flag, Interrupt Flag, Direction Flag.

Which Segment is used to store interrupt and subroutine return address registers

2009-04-27T00:17:00.000-07:00

Question :-Which Segment is used to store interrupt and subroutine return address registers?
Answer :-Stack Segment in segment register is used to store interrupt and subroutine return address registers.

What are the address lines for the hardware interrupts

2009-04-27T00:16:00.000-07:00

Question :-What are the address lines for the hardware interrupts?
Answer :-
RST 7.5 003C H

RST 6.5 0034 H

RST 5.5 002C H
TRAP 0024 H

What is meant by cross-compiler

2009-04-27T00:15:00.002-07:00

Question :-What is meant by cross-compiler?
Answer :-A program runs on one machine and executes on another is called as cross-compiler.

Give examples for Micro controller

2009-04-27T00:15:00.001-07:00

Question :-Give examples for Micro controller?
Answer :-Z80, Intel MSC51 &96, Motorola are the best examples of Microcontroller.

What are the different functional units in 8086

2009-04-27T00:13:00.002-07:00

Question :-What are the different functional units in 8086?
Answer :-Bus Interface Unit and Execution unit, are the two different functional units in 8086.

Logic calculations are done in which type of registers

2009-04-27T00:13:00.001-07:00

Question :-Logic calculations are done in which type of registers?
Answer :-Accumulator is the register in which Arithmetic and Logic calculations are done.

What is the position of the Stack Pointer after the POP instruction

2009-04-27T00:11:00.000-07:00

Question :-What is the position of the Stack Pointer after the POP instruction?
Answer :-The address line is 02 greater than the earlier value.

What is the position of the Stack Pointer after the PUSH instruction

2009-04-27T00:10:00.000-07:00

Question :-What is the position of the Stack Pointer after the PUSH instruction?
Answer :-The address line is 02 less than the earlier value.

Which is the tool used to connect the user and the computer

2009-04-27T00:09:00.000-07:00

Question :-Which is the tool used to connect the user and the computer?
Answer :-Interpreter is the tool used to connect the user and the tool.

What is SIM and RIM instructions

2009-04-27T00:04:00.000-07:00

Question :-What is SIM and RIM instructions?
Answer :-SIM is Set Interrupt Mask. Used to mask the hardware interrupts. RIM is Read Interrupt Mask. Used to check whether the interrupt is Masked or not.

What are the address lines for the software interrupts

2009-04-27T00:03:00.000-07:00

Question :-What are the address lines for the software interrupts?
Answer :-RST 0 0000 H

RST1 0008 H

RST2 0010 H

RST3 0018 H

RST4 0020 H

RST5 0028 H

RST6 0030 H

RST7 0038 H

Which Stack is used in 8086

2009-04-27T00:02:00.000-07:00

Question :-Which Stack is used in 8086?
Answer :-FIFO (First In First Out) stack is used in 8086.In this type of Stack the first stored information is retrieved first.

What are the various segment registers in 8086

2009-04-27T00:01:00.000-07:00

Question :-What are the various segment registers in 8086?
Answer :- Code, Data, Stack, Extra Segment registers in 8086.

What is the Maximum clock frequency in 8086

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Question :-What is the Maximum clock frequency in 8086?
Answer :-- 5 Mhz is the Maximum clock frequency in 8086.

Give example for Non-Maskable interrupts

2009-04-26T23:58:00.000-07:00

Question :-Give example for Non-Maskable interrupts?
Answer :-Trap is known as Non-Maskable interrupts, which is used in emergency condition.

Give examples for Maskable interrupts

2009-04-26T23:57:00.000-07:00

Question :-Give examples for Maskable interrupts?
Answer :-RST 7.5, RST6.5, RST5.5 are Maskable interrupts

Which interrupts are generally used for critical events

2009-04-26T23:56:00.002-07:00

Question :-Which interrupts are generally used for critical events?
Answer :-Non-Maskable interrupts are used in critical events. Such as Power failure, Emergency, Shut off etc.,

What is Non-Maskable interrupts

2009-04-26T23:56:00.001-07:00

Question :-What is Non-Maskable interrupts?
Answer :-An interrupt which can be never be turned off (ie.disabled) is known as Non-Maskable interrupt.

What is meant by Maskable interrupts

2009-04-26T23:55:00.000-07:00

Question :-What is meant by Maskable interrupts?
Answer :-An interrupt that can be turned off by the programmer is known as Maskable interrupt.

What are the various interrupts in 8086

2009-04-26T23:54:00.000-07:00

Question :-What are the various interrupts in 8086?
Answer :-Maskable interrupts, Non-Maskable interrupts.

What are the flags in 8086

2009-04-26T23:53:00.000-07:00

Question :-What are the flags in 8086?
Answer :-In 8086 Carry flag, Parity flag, Auxiliary carry flag, Zero flag, Overflow flag, Trace flag, Interrupt flag, Direction flag, and Sign flag.

What are level-triggering interrupt

2009-04-26T23:52:00.000-07:00

Question :-What are level-triggering interrupt?
Answer :-- RST 6.5 & RST 5.5 are level-triggering interrupts

What does Quality factor mean

2009-04-26T23:51:00.000-07:00

Question :-What does Quality factor mean?
Answer :-The Quality factor is also defined, as Q. So it is a number, which reflects the lossness of a circuit. Higher the Q, the lower are the losses.

Which interrupt is not level-sensitive in 8085

2009-04-26T23:50:00.001-07:00

Question :-Which interrupt is not level-sensitive in 8085?
Answer :-- RST 7.5 is a raising edge-triggering interrupt.

Why crystal is a preferred clock source

2009-04-26T23:49:00.000-07:00

Question :-Why crystal is a preferred clock source?
Answer :-Because of high stability, large Q (Quality Factor) & the frequency that doesn’t drift with aging. Crystal is used as a clock source most of the times.

Can an RC circuit be used as clock source for 8085

2009-04-26T23:48:00.000-07:00

Question :-Can an RC circuit be used as clock source for 8085?
Answer :-- Yes, it can be used, if an accurate clock frequency is not required. Also, the component cost is low compared to LC or Crystal.

What are input & output devices

2009-04-26T23:47:00.000-07:00

Question :-What are input & output devices?
Answer :-- Keyboards, Floppy disk are the examples of input devices. Printer, LED / LCD display, CRT Monitor are the examples of output devices.

In 8085 which is called as High order / Low order Register

2009-04-26T23:46:00.002-07:00

Question :-In 8085 which is called as High order / Low order Register?
Answer :-Flag is called as Low order register & Accumulator is called as High order Register.

What is the RST for the TRAP

2009-04-26T23:46:00.001-07:00

Question :-What is the RST for the TRAP?
Answer :-RST 4.5 is called as TRAP.

What is clock frequency for 8085

2009-04-26T23:41:00.000-07:00

Question :-What is clock frequency for 8085?
Answer :-3 MHz is the maximum clock frequency for 8085.

How many interrupts are there in 8085

2009-04-26T23:40:00.000-07:00

Question :-How many interrupts are there in 8085?
Answer :-There are 12 interrupts in 8085.

Name 5 different addressing modes

2009-04-26T23:39:00.000-07:00

Question :-Name 5 different addressing modes?
Answer :-Immediate, Direct, Register, Register indirect, Implied addressing modes.

Which interrupt has the highest priority

2009-04-26T23:38:00.002-07:00

Question :-Which interrupt has the highest priority?
Answer :-TRAP has the highest priority.

What are Software interrupts

2009-04-26T23:38:00.001-07:00

Question :-What are Software interrupts?
Answer :-RST0, RST1, RST2, RST3, RST4, RST5, RST6, RST7.

What are Hardware interrupts

2009-04-26T23:37:00.001-07:00

Question :-What are Hardware interrupts?
Answer :-TRAP, RST7.5, RST6.5, RST5.5, INTR.

In what way interrupts are classified in 8085

2009-04-26T23:36:00.000-07:00

Question :-In what way interrupts are classified in 8085?
Answer :-In 8085 the interrupts are classified as Hardware and Software interrupts.

Give an example of one address microprocessor

2009-04-26T23:35:00.000-07:00

Question :-Give an example of one address microprocessor?
Answer :-8085 is a one address microprocessor.

What is Tri-state logic

2009-04-26T23:34:00.001-07:00

Question :-What is Tri-state logic?
Answer :- Three Logic Levels are used and they are High, Low, High impedance state. The high and low are normal logic levels & high impedance state is electrical open circuit conditions. Tri-state logic has a third line called enable line.

What is meant by a bus

2009-04-26T23:33:00.000-07:00

Question :-What is meant by a bus?
Answer :-A bus is a group of conducting lines that carriers data, address, & control signals.

What happens when HLT instruction is executed in processor

2009-04-26T23:32:00.000-07:00

Question :-What happens when HLT instruction is executed in processor?
Answer :-The Micro Processor enters into Halt-State and the buses are tri-stated.

Which Stack is used in 8085

2009-04-26T23:31:00.000-07:00

Question :-Which Stack is used in 8085?
Answer :-LIFO (Last In First Out) stack is used in 8085.In this type of Stack the last stored information can be retrieved first.

What is Program counter

2009-04-26T23:30:00.000-07:00

Question :-What is Program counter?
Answer :- Program counter holds the address of either the first byte of the next instruction to be fetched for execution or the address of the next byte of a multi byte instruction, which has not been completely fetched. In both the cases it gets incremented automatically one by one as the instruction bytes get fetched. Also Program register keeps the address of the next instruction

What is Stack Pointer

2009-04-26T23:29:00.000-07:00

Question :-What is Stack Pointer?
Answer :-Stack pointer is a special purpose 16-bit register in the Microprocessor, which holds the address of the top of the stack.

What are the various flags used in 8085

2009-04-26T23:27:00.000-07:00

Question :-What are the various flags used in 8085?
Answer :-Sign flag, Zero flag, Auxillary flag, Parity flag, Carry flag.

In 8085 name the 16 bit registers

2009-04-26T23:25:00.000-07:00

Question :-In 8085 name the 16 bit registers?
Answer :-Stack pointer and Program counter all have 16 bits.

In 8085 name the 16 bit registers

2009-04-26T23:24:00.000-07:00

Question :-In 8085 name the 16 bit registers?
Answer :-Stack pointer and Program counter all have 16 bits.