1. The number of address spaces of 8085 i s . ( a) 4 (b)8 (c)2 (d)1 2 . One of these is an index register ( a) BP ( b ) SI ( c ) DX ( d ) IP 3 .

IP 3 . Which of these is an 8 bit register ? ( a) DX ( b ) CX ( c ) BX ( d ) AH 4 . The flag which indicates whether the number of 1s are odd or even in the lower 8 bits is ( a) C Y (b)Z (c)P (d)SF 5 . Which of these bits is used specially in packed BCD arithmetic? ( a) D F ( b ) CY ( c ) AC ( d ) OF 6 . If EA is used to represent Effective address then what addressing mode does EA = [ 2000] represent ( a) Register Direct ( b ) Register Indirect ( c ) Indirect Addressing ( d ) Immediate addressing 7. Which of these combinations is used by STOSB instruction ( a) ES:DI ( b ) DX:AX ( c ) SS:BP ( d ) DS:SI 8 . The first operation done by PUSH instruction is ( a) Upper Byte of data to stack & SP=SP+1 ( b ) Lower Byte of data to stack &SP=SP-1 ( c ) Lower Byte of data to stack & SP=SP+1 ( d ) Upper Byte of data to stack & SP=SP-1 9 . The following program will loop how many times MOV AX , 2 MOV DX ,0FF AGAIN:MOV CX , 0FF f DEC DX LOOP AGAIN ( a) 10 ( b ) 255 ( c ) IN FINITE ( d ) 65535 1 0. Which of these is external to the program code . ( a) Procedure ( b ) Macro ( c ) Library function

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( d ) Sub Routine 1 1. When aCMP instruction executes and the source and destination operand are not equal what will be condition of Z and carry flag when source is greater than destination ( a) Z=1,CY= 0 ( b ) Z=0,CY=1 ( c ) Z=0,CY=0 ( d ) Z=1,CY=1 1 2. Which of these calls uses only registers ( a) CALL F ( b ) CALL BX ( c ) CALL ( d ) CALL TABLE [BX] 1 3. Given the program shown below, What is the expression evaluated by this program? Pd b5 Qd b 6 Rd b7 Sd b6 MOV AL ,[P] MOV BL, [Q] ADD AL, BL MUL AL ADD AL , RMOV CL, S DIV CL ( a) (P+Q2+R)/ s ( b ) ((P+Q)2+R/S ( c ) (P+(Q+R)2)/S ( d ) ((P+Q)2+R)/S 1 4. Which of these instructions writes a byte to memory ( a) MOVSB ( b ) LOD SB ( c ) SCA SB ( d ) STO SB 1 5. In the following program what is the final value of the SI register MOV AX ,1000 MOV ES , , AX MOV DS, 3000 MOV SI, 0 MOV DI, 0 CLD MOV CX, FF AG:MOV SW LOOP AG (a) 01FE ( b ) 01FF ( c ) 01FFF ( d ) 00FF 1 6. Which of these is used for indicating that data is being written or read from the data bus ( a) DT/R ( b ) ALE ( c ) HOLD ( d ) MN/MX 1 7. Which of these signals are bidirectional ( a) HOLD,HLDA ( b ) S1,s2 ( c ) RQ,GT ( d ) S0,S1 1 8. Which of these ICs is a 3 to 8 decoder used for decoding memory addresses ( a) 74LS245/8286 ( b ) 8284A ( c ) 74LS138 ( d ) 74LS373 2 0. W h e n an I O re qu e s t s f o r D M A th e s e q u e n c e o f s i gn a l s i s ( a) H O LD , DR E Q , DAC K , H L DA ( b ) D RE Q, H OL D , DAC K , H L DA ( c ) DREQ, HOLD , HLDA , DACK ( d ) H O LD , H LDA , D R E Q , DAC K

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1 . The width of the SP register is - . ( a) 32bits ( b ) 8 bi ts ( c ) 2 4b i t s ( d ) 16 bits 2 . One of these is not the segment offset form of the absolute address 00417 ( a) 0040:0017 ( b ) 0 00 0: 0 41 7 ( c ) 0 04 1: 0 00 7 ( d ) 0417:0000 3 .One of the following is a wrong register pair ( a) CH,DH (b)DH,DL (c)BH,BL (d)AH,AL 4 . Which of these flags indicates a carry from a nibble? ( a) CY (b)Z (c)O ( d ) AC 5 .The flags used for controlling interrupts is . ( a) T F ( b ) AC (c)DF ( d ) IF 6 . Which of these combinations is not allowed in computing address? ( a) B P +S I ( b ) B P +D I ( c ) BP+BX (d)BX+SI 7 . AN 8086 instruction is of which of these forms ( a) O p c o d e , S o u r c e , D e s ti n a t i on ( b ) Op code, Destination, Source ( c ) S o u rc e , d e s t i n a t i on , Op c o d e ( d ) D e s t i n a ti o n , s ou r c e , op c o d e 8 . Which of these instructions is invalid ( a) M OV B H , C H ( b ) M OV C H , C L ( c ) MOV CX, BL ( d ) M OV B X , C X 9 . is the directive which indicates a reference point in memory and is usually used by JUMP Instructions ( a) STA RT ( b ) LABEL ( c ) O RG (d)LENGTH 1 0. Which of these uses the stack for its operation? ( a) M a c r o ( b ) L i b r ar y f u n c t i o n ( c ) S u b R o u ti n e ( d ) Procedure

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1 1. Which registers will contain the product of a 16 bit multiplication instruction ( a) B X , DX (b)CH,CL (c)AH,AL ( d ) AX,DX 1 2. Which of these calls uses only registers ( a) C A L L TA B L E [ B X ] (b)CALLF ( c ) CALL BX (d)CALL 1 3. Which combination of the flags indicate that the destination is greater than the source ( a) C Y = 1, Z = 1 ( b ) C Y = 0, Z = 1 ( c ) CY=0,Z=0 ( d ) C Y = 1, Z =0 1 4. The LOD SW opcode uses which of the following register combinations ( a) DS:SI (b)DS:DI (c)ES:DI (d)ES:SI 1 5. In the following program what is the final value of the SI register MOV AX, 1000 MOV ES, , AX MOV DS, 3000 MOV SI, 0 MOV DI , 0 CLD MOV CX , FF AG:MOV SW LOOP AG ( a) 0 ( b ) 0 1F F F ( c ) 0 0F F ( d ) 0 1F E 1 6. Which of these is an acknowledgement for DMA REQUEST? ( a) I N T R A ( b ) HLDA (c)M/IO (d)DEN 1 7. The 8086 takes over the bus when it receives one of these signals ( a) GT 1,GT 0 ( b ) RQ 0 ( c ) RQ 0 , RQ 1 (d)GT0 1 8. This signal is used to store data at memory or IO ( a) WR (b)DT/R (c)ALE ( d ) R E DY 1 9. In a 8086 system which uses one bank of 16 KX8 memory connected respectively to D0-D7.The following address lines would be connected to them ( a) A 1 t o A 14 ( b ) A 1 t o A 15 ( c ) A0 to A13 ( d ) A 0 t o A 14 2 0. The register whose contents are copied during auto-initialisation is holds the 16 bit address being used for DMA is ( a) C o m m an d Re g i s t e r ( b ) C u r r e nt wor d c ou nt r e g i s t e r

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( c ) Base Word Count registers ( d ) C u r r e nt A d d r e s s Re gi s t e r 3 . One of the following is wrong combination of registers . ( a) E S : D I ( b ) DI:SI (c)DS:SI (d)CS:IP 4 . The flag which indicates whether the number of 1s are odd or even in the lower 8 bits is__ ( a) P (b)CY (c)SF (d)Z 5 . Direction flag is used with which of these following instructions ? ( a) String ( b ) D at a t r an s f e r ( c ) L og i c a l i n s t r u c t i on s ( d ) Tra n s f e r c ont r ol 6 . If EA is used to represent Effective address then what addressing mode does EA=R represent ( a) Register Direct ( b ) I n d i r e c t A d d re s s i n g ( c ) R e gi s te r I n d i r e c t (d)Immediateaddressing 7 . Which of these is not used by MOV SB instruction ( a) E S : D I (b)DF (c)DS:SI (d)SS:BP 8 . POP instruction utilizes one of the following combinations ( a) C S : I P (b)DS:SI (c)SS:BP (d)SS:SP 9 . In the following program what is the value of CX after the loop is exited M OV A X , 2 M OV DX , 0 F F F h M OV C X , 1 0 AG A I N : D E C DX L OO P AG A I N ( a) 0 F F (b)1 (c)0 (d)0FEF 1 0. Which of parameters can be passed like in ac function call ( a) S u b R o u ti n e ( b ) L i b r ar y f u n c t i o n (c)Procedure ( d ) Macro 1 1. When a CMP instruction executes and the source and destination operand are not equal what will be condition of Z and carry flag when source is greater than destination ( a) Z = 1 , C Y = 1 (b)Z=1,CY=0 (c)Z=0,CY=0

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(d)Z=0,CY=1 12. Which of these calls uses only registers ( a) C A L L F (b)CALL ( c ) CALL BX ( d ) C A L L TA B L E [ B X ] 1 3. Given the program shown below, What is the expression evaluated by this program? Pd b5 Qd b6 Rd b7 Sd b6 MOV AL, [P] MOV BL, [Q] ADD AL, BL MUL AL ADD AL, R MOV CL, S DIV CL ( a) ( P + (Q + R) 2 ) /S ( b ) ( ( P + Q ) 2 + R) / S ( c ) ( P+Q 2 +R)/s ( d ) ( ( P +Q ) 2 + R /S 1 4. Which of these instructions uses both ES & DS segment registers ( a) S T O S B ( b ) MOV SB ( c ) L OD S B (d)SCASB 1 5. Which of these is a Prefix ( a) REP (b)ESC (c)RET ( d ) L OO P 1 6. Which of these is used for identifying when the address is output ( a) H O LD ( b ) ALE (c)MN/MX (d)DT/R 1 7. Which of these signals are bidirectional ( a) S 0 , S 1 (b)S1,s2 ( c ) RQ , GT ( d ) H O LD , H L DA 1 9. Which of these signals combination indicates a Lower 8 bit data transfer ( a) A 0 =0 & B H E =0 ( b ) A 0 =1 & B H E =0 ( c ) A0=0 & BHE=1 ( d ) A 0 =1 & B H E =1 2 0. The DMA operations are typically perform edusing which one of these signals ( a) HOLD (b)TEST ( c ) H L DA (d)BHE 1 . The 8085 is a _________ bit microprocessor ( a) 4 bit (b)8bit ( c ) 3 2b i t (d)16bit 2 . The depth of the instruction pipeline is . ( a) 6 Bytes (b)6Bits

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(c)8Bytes (d)8Bits 3 . Which of these register is called the Count Register ( a) AX (b)CX (c)BX ( d ) DX 4 . The size of the 8086 flag register is . ( a) 3 2 b i ts ( b ) 1 6b i t s (c)8bits ( d ) 6 4 bits 5 . When the result of an operaration is zero, then - . ( a) S = 1 (b)Z=0 (c)Z=1 (d)S=0 6 . If the effective address exceeds 65536 then the addressing mode is ( a) E x t r a S e gm e nt A d d r e s s i n g ( b ) I nt r a s e g m e nt ad d r e s s i n g ( c ) C o ntr a S e g m e nt A d d r e s s i n g ( d ) Inter Segment addressing 7 . Which of these instructions is an Arithmetic Instruction ( a) C L I ( b ) L OD S W (c)CWD ( d ) LOOP 8 . POP instruction utilizes one of the following combinations ( a) SS:SP (b)DS:SI (c)CS:IP (d)SS:BP 9 . which one of these directives is used for declaring arrays in assembly Language ( a) A S S U M E (b)DUP (c)LEA ( d ) SEGMENT 1 0. A block of code which replaces a predefined label is called ( a) Procedure (b)Macro ( c ) S u b R o u ti n e ( d ) L i b r ar y f u n c t i o n 1 1. The CL register contains 4 and the RCRAL, CL instruction is executed then which one of the following will take place ( a) A L i s r ot a te l e f t 4 t i m e s ( b ) A L i s r ot a te r i ght 5 t i m e s ( c ) AL is rotate left 5 times ( d ) A L i s r ot a te r i ght 4 t i m e s 1 2. The CALL F pushes ( a) CS & IP (b)OnlyCS

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(c)OnlySP (d)OnlyIP 1 3. Given the program shown below, What is the expression evaluated by this program? Pd b5 Qd b6 Rd b7 MOV AL , [P] MUL AL MOV BL, AL MOV AL, [Q] MUL AL ADD AL, BL MOV[R] , AL ( a) R =P + Q 2 ( b ) R=(P+Q)2 ( c ) R =( P 2 + Q 2 ) ( d ) R =( P + Q) 1 4. The SCA SW opcode uses which of the following register combinations ( a) D S : D I (b)DS:SI ( c ) ES:DI (d)ES:SI 1 5. In the following program what is the final value of the DI register MOV AX, 1000 MOV ES, , AX MOV DS, 3000 MOV SI, 0 MOV DI, 0 CLD MOV CX, FF AG: MOV SW LOOP AG ( a) 0 ( b ) 0 1F E ( c ) 0 0F F ( d ) 01FFF 1 6. Which of these signals indicates that an Interrupt Request is being acknowledge ( a) I N T R A ( b ) HLDA (c)M/IO (d)DEN 1 7. Which of these are the coprocessors used in maximum mode by 8086 ( a) 8 05 1 ( b ) 8 08 7 ( c ) 8 08 8 ( d ) 8085 1 8. The IC which provides Clock, Ready & Reset signals to the 8086 is ( a) 8 28 4A ( b ) 7 4L S 1 38 ( c ) 7 4L S 2 45 /8 2 86 ( d ) 74LS373 1 9. Which of these signals combination indicates a upper 8 bit data transfer ( a) A 0 =1 & B H E =0 ( b ) A 0 =1 & B H E =1 ( c ) A0=0 &BHE=0 ( d ) A 0 =0 & B H E =1 2 0. DMA is sometimes called as ( a) C y c l e S t e al i n g (b)InstructionCycle ( c ) Fetch Cycle ( d ) M a ch i n e C yc l e 1 . T h e 80 85 i s a b i t m i c r o p ro c e s s o r ( a) 1 6 b i t (b)8bit (c)4bit ( d ) 3 2b i t

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2 . O n e o f t h e s e i s an i n d e x r e g i s t e r ( a) B P ( b ) DX (c)SI (d)IP 3 . O n e o f t h e f ol l ow i n g i s a w ro n g r e g i s t e r p a i r ( a) B H , B L (b)DH,DL (c)CH,DH (d)AH,AL 4 . S t r i n g op e r a t i on s au t o i n c r e m e nt o r d e c re me nt i s i n d i c a t e d by . ( a) T F (b)DF (c)IF ( d ) AC 5 . W h i ch o f th e f o l l ow i n g i s m as ka b l e ? ( a) N M I (b)RESET ( c ) I nt e r r u p t r e qu e s t ( d ) H O LD 6 . B a s e I n d e x e d ad d r e s s i n g h a s th e E A ( a) DX +B X (b)SI+BX (c)SI+DI (d)BX+BP 7 . W h i ch o f th e s e i s n ot u s e d by M OV S B i n s t r u c t i on ( a) D S : S I (b)ES:DI (c)SS:BP (d)DF 8 . T h e i n s t r u c t io n w h i ch i s u s e d t o t r an s f e r p r og r am i n s t r uc ti o n s to & f ro m a c o - p r o c e s s or i s ( a) T E S T ( b ) L OC K (c)NOP (d)ESC 9 . W h i ch o f th e s e D i r e c t i ve s w i l l fi x t h e a d d r e s s of m e m o r y l o c at i o n f r o mwhe r e th e a s s e mb l i n g s h o u l d s t a rt ( a) S TA RT ( b ) O RG (c)LABEL (d)LENGTH 1 0. A b l o ck o f c o de w h i ch re p l ac e s a p r e d e fi n e d l ab e l i s c al l e d ( a) M a c r o (b)Procedure ( c ) S u b R o u ti n e ( d ) L i b r ar y f u n c t i o n 1 1. W h i ch r e g i s t e r s w i l l c o nta i n t h e d i v id e n d o f a 1 6 b i t d i v i s i on i n s t r u c t i on

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( a) C H , C L ( b ) A X , DX ( c ) B X , DX (d)AH,AL 1 2. T h e C A L L Fa r i s ( a) 1 6 b i t c a ll b e yon d t h e c u r r e nt s e g m e nt ( b ) 2 0 b i t c a ll i n t h e s am e s e g m e nt ( c ) 2 0 b i t c a ll b e yon d t h e c u r r e nt s e g m e nt ( d ) 1 6 b i t c a l l i n t h e s am e s e g m e nt 1 3. W h i ch o n e of th e s e i n s tr u c t i o n s c ou l d b e u s e d f o r s wa p p i n g i n a s o r t program ( a) XC H G A X , DX ( b ) M OV A X , B X ( c ) S U B A X <DX ( d ) S B B A X , DX 14 Which of these instructions reads a byte from memory and stores t h e by t e i n an o t h e r me m o r y l o c at i o n ( a) S T O S B ( b ) L OD S B ( c ) M OV S B (d)SCASB 1 5. W h i ch o f t h e s e i s a P r e fi x ( a) R E P (b)RET (c)ESC ( d ) L OO P 1 6. W h i ch o f t h e s e s i g n a l s i s u s e d f or DM A o p e r at i o n s ( a) H O LD (b)ALE (c)MN/MX (d)DT/R 1 7. H ow m a ny c o p ro c e s s o rs c a n 8 08 6 h an d l e i n m a x i mu m m o d e ( a) 3 (b)0 (c)2 (d)1 1 8. D at a i s t ra n s m i t t e d a n d r e c e i ve d by th i s I C an d i t i s al s o c a l l e d th e B u s Transceive r ( a) 7 4L S 2 45 /8 2 86 ( b ) 7 4L S 3 73 ( c ) 8 28 4A ( d ) 7 4L S 1 38 1 9. W h a t wo u l d b e t h e b r oa d m e m o ry l o c a ti o n of th e RO M f r om w h i ch t h e C PUre a d s i n s t r u c t i on s i m m e d i at e l y a f t e r R E S E T s i gn a l i s gi ve n ( a) 4 00 00 t o 7 F F F F ( b ) 8 00 00 t o 7 9F F F ( c ) 0 00 00 t o F F F F ( d ) F 0 00 0 t o F F F F F 2 0. T h e re gi s t e r w h i ch h o l d s t h e nu mb e r of byt e s t r an s f e r re d i s

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( a) C u r r e nt A d d r e s s Re gi s t e r ( b ) B a s e A d d r e s s an d B a s e Wor d C ou nt r e g i s t e r s ( c ) C o m m an d Re g i s t e r ( d ) C u r r e nt wor d c ou nt r e g i s t e r 1 . T h e ad d r e s s b u s of 80 8 5 h as . ( a) 1 6 b i t ( b ) 3 2b i t (c)4bit (d)8bit 2 . T h e nu mb e r of u n i t s i n 80 86 i s - . ( a) 1 (b)2 (c)4 (d)6 3 . T h e w i d t h o f t h e s e g m e nt re gi s t e r i s . ( a) 1 6b i t s (b)8bits ( c ) 3 2b i t s ( d ) 2 0b i t s 4 . I n th e fl a g re g i s t e r , h ow m a ny s t a tu s fl ag s ar e th e re ? ( a) 4 (b)3 (c)5 (d)6 5 . W h i ch o f th e f o l l ow i n g fl a gs i s s e t w h e n an i nte rn a l i nt e r r u p t is caused ? ( a) O F (b)DF (c)IF (d)TF 6 . T h e ty p e of a d d re s s i n g w h e n E A = B P + d i s p l a c e m e nt i s c a l l e d ( a) R e gi s te r w i t h d i s p l a c e m e nt ( b ) B a s e w i t h d i s p l a c e m e nt ( c ) I n d i r e c t ad d r e s s i n g ( d ) I n d e x e d w i t h d i s p l a c e m e nt 7 . W h i ch o f th e s e i n s tr u c t i o n s i s a Tr a n s f e r C ont r ol I n s t r u c t i on ( a) C L I (b)CW D ( c ) L OD S W ( d ) L OO P 8 . T h e fi r s t o p e r at i o n d o n e by P U S H i n s t r uc ti o n i s ( a) L owe r B y t e o f d a t a to s ta ck & S P = S P - 1 ( b ) U p p e r B y t e o f d a t a to s ta ck & S P = S P - 1 ( c ) U p p e r B y t e o f d a t a to s ta ck & S P = S P + 1 ( d ) L owe r B y t e o f d a t a to s ta ck & S P = S P + 1 9 . W h i ch o n e of th e s e d i r e c ti ve s s h o rt e n s t h e i n s t r u c t i o n M OV DX , O F F SETme mloc ( a) A S S U M E (b)DUP (c)SEGMENT

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(d)LEA 1 0. W h i ch o f th e s e i s e x t e r n al to t h e p ro g ra m c o d e . ( a) L i b r ar y f u n c t i o n (b)Macro (c)Procedure ( d ) S u b R o u ti n e 1 1. W h i ch o f th e s e i n s tr u c t i o n s c o nve rt s t h e b i n a ry c ont e nt s o f r e g i s t e r A L i nt o u n p a cke d B C D re s u l t i n A H & A L ( a) A A M (b)AAD (c)AAS (d)AAA 1 2. W h i ch o f th e s e i s a n i n d i r e c t c a l l ( a) C A L L TA B L E [ B X ] (b)CALLF (c)CALLBX (d)CALL 1 3. Given the program shown below , What is the value or R a f t e r t h i s p r o gr a m executes? Pd b 5 Q d b 6 R d b 7 M OV A L, [P] M U L A L M OV B L, A L M OV A L, [Q] A D D A L , B L M OV [ R ] , A L ( a) R =( P + Q) ( b ) R =( P + Q) 2 ( c ) R =( P 2 + Q 2 ) ( d ) R =P + Q 2 1 4. The S C A S W o p c o d e u s e s which of the following register combinations ( a) E S : S I (b)ES:DI (c)DS:DI (d)DS:SI 1 5. I n th e f o l l ow i n g p r o gr a m w h a t i s t h e fi n al va l u e o f t h e D I r e g i s t e r M OV A X , 1 00 0 M OV E S , , A X M OV D S , 3 00 0 M OV S I , 0 M OV D I , 0 C L D M OV C X , F F AG :M OV S W L OO P AG ( a) 0 1F F F ( b ) 0 0F F ( c ) 0 1F E (d)0 1 6. W h i ch o f th e s e i s a n ack n ow l e d g e m e nt f o r D M A r e q u e s t ( a) H L DA (b)DEN (c)INTRA (d)M/IO 1 7. W h i ch o f th e s e i n s tr u c t i o n s i n i t i a te s RQ0 , G T 0 o r RQ 1 or G T 1 ( a) C L S (b)STI (c)ESC ( d ) L OC K 1 8. W h i ch o f th e s e s i gn a l s i s u s e d to f or i nt r o d uc i n g wai t c yc l e s ( a) A L E ( b ) R E A DY (c)WR

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(d)DT/R 1 9. W h i ch o f th e s e i n d i c a t e s ac c e s s to a n o d d m e m or y l o c a ti o n ( a) A 0 =0 & B H E =0 ( b ) A 0 =1 & B H E =0 ( c ) A 0 =0 & B H E =1 ( d ) A 0 =1 & B H E =1 2 0. T h e r e gi s te r w h i ch h o l d s t h e 16 b i t a d d r e s s b e i n g u s e d f o r D M A i s ( a) C u r r e nt A d d r e s s Re gi s t e r ( b ) C o m m an d Re g i s t e r ( c ) C u r r e nt wor d c ou nt r e g i s t e r ( d ) B a s e A d d r e s s an d B a s e Wor d C ou nt r e g i s t e r s 1 . T h e nu mb e r of s t a tu s fl a g b i ts of 8 08 5 i s . ( a) 6 (b)8 (c)5 (d)7 2 . O n e o f t h e s e c o mb i n at i o n i s inval i d ( a) S S : S P (b)SS:BP (c)CS:IP (d)SS:IP 3 . O n e o f t h e f ol l ow i n g i s a w ro n g r e g i s t e r p a i r ( a) A H , A L (b)CH,DH (c)DH,DL (d)BH,BL 4 . T h e fl ag u s e d f o r s i n g l e s te p o p e r at i o n s i s ( a) I F (b)DF (c)TF ( d ) AC 5 . W h i ch o f th e f o l l ow i n g i s m as ka b l e ? ( a) H O LD (b)RESET (c)NMI ( d ) I nt e r r u p t r e qu e s t 6 . T h e ty p e of a d d re s s i n g w h e n E A = B P + d i s p l a c e m e nt i s c a l l e d ( a) I n d e x e d w i t h d i s p l a c e m e nt ( b ) R e gi s te r w i t h d i s p l a c e m e nt ( c ) I n d i r e c t ad d r e s s i n g ( d ) B a s e w i t h d i s p l a c e m e nt 7 . W h i ch o f th e s e i s a n i nva l i d i n s t r u c t i on ( a) M OV A X , C S ( b ) M OV C S , D S ( c ) M OV A X , B X ( d ) M OV D S , A X 8 . P O P i n s tr u c t i o n u t i l i z e s on e o f t h e f ol l ow i n g c o mb i n a t i on s ( a) D S : S I (b)SS:BP (c)SS:SP

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(d)CS:IP 9 . T h e d i r e c t i ve w h i ch t e l l s t h e a d d r e s s f r om w h e r e t h e p ro g ra m s h ou l d s ta r t e x e c u t i o n i s gi ve n by ( a) L A B E L (b)LENGTH ( c ) S TA RT ( d ) O RG 1 0. W h i ch o f th e s e u s e s t h e s t ack f or i t s op e r at i on ( a) L i b r ar y f u n c t i o n ( b ) S u b R o u ti n e (c)Macro (d)Procedure 1 1. W h i ch r e g i s t e r s w i l l c o nta i n t h e p r o d u c t of a 8 b i t mu l ti p l i c at i o n i n s t r u c t ion ( a) A H , A L (b)CH,CL ( c ) B X , DX ( d ) A X , DX 1 2. T h e C A L L n e a r i s ( a) 1 6 b i t c a ll b e yon d t h e c u r r e nt s e g m e nt ( b ) 2 0 b i t c a ll b e yon d t h e c u r r e nt s e g m e nt ( c ) 1 6 b i t c a ll i n t h e s am e s e g m e nt ( d ) 2 0 b i t c a ll i n t h e s am e s e g m e nt 1 3. Fo r s o r t i n g N nu mb e r s h ow m a ny l o op s ar e n e c e s s ar y ( a) 2 (b)3 (c)1 (d)4 1 4. W h i ch o f th e s e i n s tr u c t i o n s w r i t e s a byt e to m e m or y ( a) L OD S B ( b ) M OV S B (c)STOSB (d)SCASB 1 5. I n th e f o l l ow i n g p r o gr a m w h a t i s t h e fi n al va l u e o f t h e D I r e g i s t e r M OVAX , 1 00 0 MOVES , , A X M OV D S , 3 00 0 M OV S I , 0 M OV D I , 0 C L D M OV C X , F F AG : M OV S W L OO P AG ( a) 0 0F F ( b ) 0 1F E ( c ) 0 1F F F (d)0 1 6. W h i ch o f th e s e s i gn a l s i n d i c a t e s th a t a n I nt e r r u p t Re qu e s t i s b e i n g a ck n owl e d g e ( a) H L DA (b)INTRA (c)M/IO (d)DEN 1 7. W h i ch o f t h e s e s i g n a l s a r e b i d i r e c t i o n al ( a) S 0 , S 1 (b)S1,s2

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( c ) H O LD , H L DA ( d ) RQ , G T 1 8. T h e 80 86 u s e s t h i s s i g n al to s e n d o r r e c e i ve d a t a ( a) R E A DY (b)DT/R (c)ALE (d)WR 1 9. I f a 8K X 8 S t a t i c RA M i s t o b e l o c at e d s t a rt i n g f r om e x ac tl y t h e m i d d l e of t h e 808 6 memory address space, its location will be in which of the following memory areas ( a) 8 00 00 t o 7 9F F F ( b ) 4 00 00 t o 7 F F F F ( c ) 0 00 00 t o F F F F ( d ) F 0 00 0 t o F F F F F 2 0. The DMA operations are typically performed using which one of these signals ( a) H O LD (b)TEST ( c ) H L DA (d)BHE 1 . T h e ad d r e s s b u s of 80 8 5 h as . ( a) 3 2b i t (b)16bit (c)4bit (d)8bit 2 . O n e o f t h e s e i s an i n d e x r e g i s t e r ( a) DX (b)IP (c)SI (d)BP 3 . O n e o f t h e f ol l ow i n g i s w r on g c o mb i n at i o n of r e g i s t e r s . ( a) C S : I P (b)DS:SI (c)ES:DI (d)DI:SI 4 . T h e fl ag w h i ch i n d i c a te s w h e t h e r th e nu mb e r o f 1 s a r e o d d o r e ve n i n t h e l owe r 8 b i t s i s . ( a) S F (b)P (c)CY (d)Z 5 . W h i ch o f th e s e b i t s i s u s e d s p e c i al l y i n p a cke d B C D a r i t h m e t i c ? ( a) D F (b)CY ( c ) AC (d)OF 6 . I f E A i s u s e d t o re p re s e nt E ff e c ti ve ad d r e s s t h e n w ha t a d d r e s s i n g m o d e do e s E A = R r e p r e s e nt ( a) I m m e d i a t e a d d r e s s i n g ( b ) R e gi s te r D i re c t ( c ) I n d i r e c t A d d re s s i n g ( d ) R e gi s te r I n d i r e c t 7 . W h i ch o f th e s e i s n ot u s e d by M OV S B i n s t r u c t i on

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( a) E S : D I (b)DF (c)SS:BP (d)DS:SI 8 . M OV C X , [ B X +D I ] l oa d s C X r e g i s t e r w i t h d a t a of w i d t h ( a) 4 b i t s ( b ) 1 6 b i ts ( c ) 3 2 b i ts (d)8bits 9 . I n th e f o l l ow i n g p r o gr a m w h a t i s t h e va l u e o f DX af t e r t h e l o op i s e x i t e d M OV A X , 2 M OV DX , 0 F F F h M OV C X , 1 0 AG A I N : D E C DX L OO P AG AIN ( a) 1 (b)0 (c)0FEF (d)0FF 1 0. W h i ch o f p ar am e te rs c a n b e p a s s e d l i ke i n a c f u n c t i on c al l ( a) P r o c e d u r e (b)Macro ( c ) S u b R o u ti n e ( d ) L i b r ar y f u n c t i o n 1 1. W h i ch o n e of th e s e i n s tr u c t i o n t a ke s t h e twos c o m p l i m e nt ( a) N E G (b)SBB ( c ) XOR (d)NOT 1 2. W h i ch o f th e s e c a l l s u s e s on l y r e g i s t e r s ( a) C A L L TA B L E [ B X ] (b)CALL (c)CALLBX (d)CALLF 1 3. G i ve n t h e p r og r am s h ow n b e l ow , W h a t i s t h e e x p re s s i o n e val u a t e d by t h i s p r o gr a m ? P d b 5 Q d b 6 R d b 7 S d b 6 M OV A L , [ P ] M OV B L , [ Q] A D D A L , B L M U L A L A D D A L , R M OV C L , S D I V C L ( a) ( ( P +Q ) 2 + R /S ( b ) ( P + Q 2 + R) / s ( c ) ( ( P + Q ) 2+ R) / S ( d ) ( P + (Q + R) 2) /S 1 4. W h i ch o f th e s e i n s tr u c t i o n s r e a d s a by t e f r o m m e m o r y an d s t or e s t h e by t e i n an o t h e r m e m o ry l o c at i o n ( a) S C A S B ( b ) M OV S B ( c ) L OD S B (d)STOSB 1 5. W h i ch o f th e f o l l ow i n g i n s t r u c t i on s a re u s e d f o r s e a r ch i n g a by t e i n a s t r i n g o f by t e s ( a) C M P S B ( b ) M OV S B (c)SCASW (d)SCASB 1 6. W h i ch o f th e s e i s a n ack n ow l e d g e m e nt f o r D M A r e q u e s t

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( a) H L DA (b)INTRA (c)M/IO (d)DEN 1 7. W h i ch o f th e s e s i gn a l s s e l e c t s c op r o c e s s or o p e r a t i on o f th e 8 08 6 ( a) M N / M X (b)DT/R (c)ALE ( d ) H O LD 1 8. W h i ch o f th e s e I C s i s a 3 t o 8 d e c o d e r u s e d f o r d e c o d i n g m e m o ry ad d r e s s e s ( a) 8 28 4A ( b ) 7 4L S 1 3 8 ( c ) 7 4L S 2 45 /8 28 6 ( d ) 7 4L S 3 73 1 9. W h i ch o f th e s e s i gn a l s c o mb i n at i o n i n d i c a t e s a L owe r 8 b i t d a ta t r a n s f e r ( a) A 0 =0 & B H E =0 ( b ) A 0 =1 & B H E =0 ( c ) A 0 =0 & B H E =1 ( d ) A 0 =1 & B H E =1 2 0. D M A i s s o m e t i m e s c al l e d a s ( a) M a ch i n e C yc l e ( b ) C y c l e S t e al i n g ( c ) Fe tch C y c l e (d)InstructionCycle 1 . The width of the SP register is - . ( a) 3 2b i t s ( b ) 2 4b i t s ( c ) 8 b i ts ( d ) 1 6b i t s 2 . The 8086 has the following byte order . ( a) Little Endian ( b ) J u mb l e d E n d i a n (c)ByEndian ( d ) M e d i u m E n d i an 3 . One of the following is a wrong register pair ( a) B H , B L (b)AH,AL ( c ) CH,DH (d)DH,DL 4 . The flag which indicates whether the number of 1s is odd or even in the lower 8 bits is ( a) P (b)SF (c)Z (d)CY 5 . Which of the following is maskable ? ( a) R E S E T ( b ) H O LD ( c ) Interrupt request (d)NMI

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6 . If EA is used to represent Effective address then what addressing mode does EA= [2000] represent (a) Indirect Addressing ( b ) R e gi s te r D i re c t ( c ) R e gi s te r I n d i r e c t (d)Immediateaddressing 7 . Which of these registers is used by LOOP instruction ( a) CX (b)BP (c)CS (d)SI 8 . Which of these instructions uses BX register to point to at able and AL register to look up at able is ( a) XOR ( b ) XC H G ( c ) L OO P ( d ) X LAT 9 . Which of these Directives will f x the address of memory location from where the assembling should start ( a) S TA RT (b)LENGTH ( c ) ORG (d)LABEL 1 0. A Block of code is called repeatedly. Which of the following increases the overall size of the code by as many times asitis called ? ( a) L i b r ar y f u n c t i o n ( b ) S u b R o u ti n e (c)Procedure ( d ) Macro 11. Which registers will contain the dividend of a 16 bit division instruction ( a) AX,DX ( b ) B X , DX (c)AH,AL (d)CH,CL 1 2. Which of these is an intra-segment call ( a) C A L L TA B L E [ B X ] (b)CALLBX ( c ) CALL (d)CALLF 1 3. Which combination of the flags indicate that the destination is greater than the source ( a) C Y = 1, Z =0 ( b ) C Y = 0, Z = 1 ( c ) C Y = 1, Z = 1 ( d ) CY=0,Z=0 14. The LOD SW opcode uses which of the following register combinations ( a) E S : S I (b)ES:DI (c)DS:DI ( d ) DS:SI 1 5. Which of thes e is a Prefix ( a) L OO P

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(b)RET (c)ESC ( d ) REP 1 6. Which of these signals indicates that an Interrupt Request is being acknowledge ( a) H L DA ( b ) INTRA (c)M/IO (d)DEN 1 7. How many coprocessors can 8086 handle in minimum mode ( a) 3 (b)0 (c)2 (d)1 18. The IC which provides Clock, Ready &Reset signals to the 8086 is ( a) 7 4L S 3 73 ( b ) 8284A ( c ) 7 4L S 1 38 ( d ) 7 4L S 2 45 /8 2 86 1 9. What would be the broad memory location of the ROM from which the CPU reads instructions immediately after RESET signal is given ( a) F0000 to FFFFF ( b ) 0 00 00 t o F F F F ( c ) 8 00 00 t o 7 9F F F ( d ) 4 00 00 t o 7 F F F F 2 0. The register whose contents are copied during auto-initialization is holds the 16 bit address being used for DMA is ( a) C u r r e nt wor d c ou nt r e g i s t e r ( b ) C u r r e nt A d d r e s s Re gi s t e r ( c ) Base Word Count registers ( d ) C o m m an d Re g i s t e r 1 . The number of status flag bits of 8085 is . ( a) 6 (b)5 (c)7 (d)8 2 . The number of units in 8086 is - . ( a) 1 (b)6 (c)4 (d)2 3 . The width of the segment register is . ( a) 1 6 bits ( b ) 3 2b i t s (c)8bits ( d ) 2 0b i t s 4 . String operations auto increment or decrement is indicated by . ( a) I F ( b ) AC (c)DF (d)TF

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5 . Which of the following is maskable ? ( a) N M I ( b ) Interru pt request ( c ) H O LD (d)RESET 6 . Base Indexed addressing has the EA ( a) DX +B X (b)SI+DI (c)BX+BP (d)SI+BX 7 . Which of these instructions is valid ( a) M OV S I , D I ( b ) M OV A X , [ B X + B P ] ( c ) M OV E S , D S ( d ) M OV A X , [ S I + D I ] 9 . The following program will loop how many times MOV AX, 2 MOV DX, 0FF AGAIN:MOV CX, 0FF f DEC DX LOOP AGAIN ( a) 6 55 35 ( b ) INFINITE ( c ) 2 55 ( d ) 1 0 1 0. Which of these uses the stack for its operation ( a) P r o c e d u r e ( b ) L i b r ar y f u n c t i o n ( c ) S u b R o u ti n e (d)Macro 1 1. Which registers will contain the product of a 8 bit multiplication instruction ( a) B X , DX (b)AH, AL ( c ) A X , DX (d)CH,CL 1 2. The CALL near is ( a) 2 0 b i t c a ll b e yon d t h e c u r r e nt s e g m e nt ( b ) 1 6 b i t c a ll b e yon d t h e c u r r e nt s e g m e nt ( c ) 1 6 bit call in the same segment ( d ) 2 0 b i t c a ll i n t h e s am e s e g m e nt 1 3. Which combination of the flags indicate that the source is greater than the destination ( a) C Y = 0, Z = 0 ( b ) C Y = 1, Z = 1 ( c ) C Y = 0, Z = 1 ( d ) C Y = 1, Z =0 14. Which of these instructions uses DS segment register only ( a) S C A S B ( b ) LOD SB (c)STOSB ( d ) M OV S B 1 6. Which of these is an acknoledgement for DMA request ( a) HLDA (b)DEN (c)INTRA (d)M/IO 1 7. Which of these signals selects coprocess or operation of the 8086

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( a) H O LD (b)DT/R (c)ALE ( d ) MN/MX 1 8. The Bus is reserved for data during which of these cycles ( a) T 3 (b)T4 (c)T2 (d)T1 1 9. Which of these signals combination is invalid ( a) A0 =1 &BHE=1 ( b ) A 0 =0 & B H E =1 ( c ) A 0 =0 & B H E =0 ( d ) A 0 =1 & B H E =0 2 0. The register which holds the number of bytes transferred is ( a) C u r r e nt A d d r e s s Re gi s t e r ( b ) C o m m an d Re g i s t e r ( c ) B a s e A d d r e s s an d B a s e Wor d C ou nt r e g i s t e r s ( d ) Current word count register 1 . The number of pins which 8085 has are . ( a) 4 0 (b)44 (c)28 (d)16 3. The width of the segment register is . ( a) 2 0b i t s ( b ) 1 6b i t s ( c ) 3 2b i t s (d)8bits 4 . The size of the 8086 flag register is . ( a) 3 2 b i ts ( b ) 1 6b i t s ( c ) 6 4b i t s (d)8bits 5 . Direction flag is used with which of these following instructions a) String ( b ) L og i c a l i n s t r u c t i on s ( c ) Tra n s f e r c ont r ol ( d ) D at a t r an s f e r 6 . Base Indexed addressing has the EA ( a) SI+BX ( b ) DX +B X (c)SI+DI (d)BX+BP 7 . Which of these instructions is valid ( a) M OV A X , [ S I + D I ] ( b ) M OV E S , D S ( c ) M OV S I , D I ( d ) M OV A X , [ B X + B P ]

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8 . The instruction which does not allow the interrupt request signal to interrupt the instruction which follows it is no operation is ( a) LOCK (b)TEST (c)NOP (d)ESC 9 . In the following program what is the value of CX after the loop is exited MOV AX, 2 MOV DX, 0FFFh MOV CX, 10 AGAIN:DEC DX LOOP AGAIN ( a) 0 F E F (b)0FF (c)0 (d)1 1 0. Which of these does not increase the size of code as multiples of the time it is called ( a) S u b R o u ti n e ( b ) Macro (c)Procedure ( d ) L i b r ar y f u n c t i o n 1 1. Which one of these instruction takes the twos compliment ( a) N E G (b)SBB ( c ) XOR (d)NOT 1 2. T h e C A L L n e a r i s ( a) 2 0 b i t c a ll i n t h e s am e s e g m e nt ( b ) 2 0 b i t c a ll b e yon d t h e c u r r e nt s e g m e nt ( c ) 1 6 bit call in the same segment ( d ) 1 6 b i t c a ll b e yon d t h e c u r r e nt s e g m e nt 1 3. The outer loop counter for N numbers is ( a) N (b)N/1 (c)N-2 (d)N/2 1 4. Which of these instructions reads a byte from memory and stores the byte in another memory location ( a) S T O S B ( b ) M OV S B ( c ) L OD S B (d)SCASB 1 6. Which of these is used for indicating that data is being written or read from the data bus ( a) H O LD (b)ALE (c)MN/MX (d)DT/R 1 7. The signal generated by the 8086 in maximum mode requesting a co -processors to take over the bus is ( a) RQ , G T (b)S1,s2 ( c ) H O LD , H L DA (d)S0,S1 1 8. This signal is used to de multiplex address&data ( a) W R

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(b)ALE ( c ) R E A DY (d)DT/R 1 9. Which of these signals combination indicates a upper 8 bit data transfer ( a) A 0 =0 & B H E =0 ( b ) A 0 =0 & B H E =1 ( c ) A 0 =1 & B H E =0 ( d ) A 0 =1 & B H E =1 2 0. The 8259 is programmed using this register ( a) C u r r e nt wor d c ou nt r e g i s t e r ( b ) C u r r e nt A d d r e s s Re gi s t e r ( c ) B a s e A d d r e s s an d B a s e Wor d C ou nt r e g i s t e r s ( d ) Command Register

4th unit bits newly updated( 24 - 28 page)

reminig bits given bellow

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4th UNIT (newly updated 1st on whole web)

1 . W h i ch o f th e s e i s S i n gl e H a n d S h a ke ( a) S T B f o l l owe d by AC K a n d r e m oval of AC K ( b ) S T B o n l y ( c ) S T B f ol l owe d by AC K ( d ) AC K f ol l owe d by S T B 2 . At p owe r o n or af t e r re s e t t h e p or t s a r e i n w h i ch o f t h e s e c o n d i t i on s ( a) P O RT A = I N P U T , P O RT B =I N P U T , P ORT C = I N P U T ( b ) P O RT A = I N P U T , P O RT B =O U T P U T , P O RT C = O U T P U T ( c ) P O RT A = O U T P U T , P ORT B = I N P U T , P O RT C = O U T P U T ( d ) P O RT A = I N P U T , P O RT B =I N P UT , P ORT C = OU T P U T 3 . W h i ch o f th e s e ke y s w i tch e s i s n on m e ch an i c al c ont a c t ty p e ? ( a) M E M B R A NE K E Y S W I T C H E S ( b ) H A L L E F F E C T K E Y S W I T C H E S ( c ) M E C H A N I C A L KE Y S W I T C H E S ( d ) M AG N E T I C RE E D K E Y S W I T C H E S 4 . H ow m a ny s t e p s p e r r e vo l u t i on d o e s a s te p p e r m o to r i n h a l f s t e p m o d e take ? ( a) 2 00 ( b ) 2 20 ( c ) 4 00 ( d ) 3 80 5 . A n 8 b i t A /D c onve rt e r w i t h a r e f e r e n c e vol t a ge of 5 Vo l t s w i l l b e ab l e to r e a d a lowest n o n z e ro vo l ta g e o f ( a) 2 0 m V ( b ) 1 9. 5 m V ( c ) 1 9 m V ( d ) 2 1 m (V), 1 . T h e 82 55 P P I ha s ( a) 6 4 p i n s ( b ) 1 6 p i n s ( c ) 4 0 p i n s ( d ) 2 8 p i n s 2 . I f t h e c ont r ol wor d 09 B H i s g i ve n t o t h e c ont r ol r e g i s t e r o f t h e 8 25 5 P P I t h e n wh i ch o f t h e s e op t i o n s a r e th e c o n d i t i on o f th e p o r ts ( a) B I T S E T R E S E T ( b ) A LL P O RT s I N P U T ( c ) A L L P O RT s OU T P U T ( d ) P O RT s A & B I N P U T , P O RT COU T P U T 3 . I f 8 s e ve n s e g m e nt l e d n on mu l t i p l e x e d d i s p l ay s i n c l u d i n g t h e d e c i m a l p o int a r e c o n n e c t e d . H ow m a ny w i re s a re n e e d e d t o c on n e c t t h e s e gm e nt s ( n o t i nc l u d i n g p owe r s u p p l y w i r e s ) ? ( a) 6 4 ( b ) 1 5 ( c ) 5 6 ( d ) 1 6 4 . W h a t i s t h e an g l e p e r s t e p of a s t e p p e r m o t or i n f u l l s t e p m o d e ? ( a) 0 . 45 d eg r e e s ( b ) 1 . 0 d e gr e e s ( c ) 0 . 9 d e gr e e s ( d ) 1 . 8 d e gr e e s

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5 . I n th e A / D c o nve r t e r A D C 0 8 08 w h i ch of t h e s e s i gn a l s i s u s e d s e l e c t a n a na lo g i n p u t ch an n e l t o b e d i g i t i s e d ( a) E O C ( b ) O E ( c ) A L E ( d ) S O C 1 . W h i ch o f th e s e i s D ou b l e H an d S h ake ( a) S T B o n l y ( b ) S T B f o l l owe d by AC K ( c ) S T B f o l l owe d by AC K a n d r e m oval of AC K ( d ) AC K f ol l owe d by S T B 2 . At p owe r o n or af t e r re s e t t h e p or t s a r e i n w h i ch o f t h e s e c o n d i t i on s ( a) P O RTA = I N P U T , P O RT B =I N P U T , P ORT C = I N P U T ( b ) P O RT A = I N P U T , P O RT B =I NP U T , P ORT C = OU T P U T ( c ) P O RT A = I N P U T , P O RT B =O U T P U T , P O RT C = O U TP U T ( d ) P O RT A = O U T P U T , P ORT B = I N P U T , P O RT C = O U T P U T

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3 . W h i ch o f th e s e Pe r i p h e r a l I C s i s m ad e f o r i nte rf ac i n g K e y b oa r d s a n d M u l t i pl e x e d L E D d i s p l ay s ? ( a) 8 25 9 ( b ) 8 23 7 ( c ) 8 25 1 ( d ) 8 27 9 4 . W h i ch o f th e s e m o t or s wor k s l i ke a d ig i t al s y s t e m ( a) D C M OT O R ( b ) S T E P PE R M O T O R ( c ) I N D U C T I ON M O T OR ( d ) S Y N C H RON O U S M O T O R 5 . A n 8 b i t A /D c onve rt e r w i t h a r e f e r e n c e vol t a ge of 5 Vo l t s w i l l b e ab l e to r e a d a lowe s t n o n z e ro vo l ta g e o f ( a) 2 0 m V ( b ) 1 9. 5 m V ( c ) 2 1 m V ( d ) 1 9 m (V), 6 . T h e t h i rd re s p o n s e o f th e 8 08 6t o a n i nt e r ru p t i s w h i ch on e of t h e f o l l ow i n g ? (a) D e c r e m e nt s th e S P & p u s h e s c u rr e nt C S c o nt e nt s ( b ) R e s e t s Tr a p F l a g ( c )I t d i s ab l e s i nt e r ru p t fl a g ( d ) D e c r e m e nt s th e S P by 2 & p u s h e s fl a g r e gi s te

m o 1 . G r o u p B p o rt as s i gn m e nt s of 82 55 i s ( a) Po rt B & L owe rc Por t C ( b ) Po rt A & U p p . er Po r t C ( c ) Po rt B & U p p e r Por t C ( d ) Po rt A & L owe r Po r t C t o p 2 . I f t h e c o nt ro l wo rd 0 0 i s gi ve n t o t h e c o ntr o l r e gi s te r o f t h e 8 25 5 P P I t h e n w h s ich of th e s e o p ti o n s a re th e c on d i t i o n o f t h e p or t s ( a) B I T S E T R E S E T ( b ) A L L PO RT s OU T P U T ( c ) P O RT s A & B I N P U T , P Og RT C OU T P U T ( d ) A L L P O RT s I o NP U T l b . 3 . I f 8 s e ve n s e g me nt l e d n o n mu l t i p l e a x e d d i s p l ay s i n c l u d in g th e d e c i m a l p o int a re a l l l i g ht e d u p a n d e a ch o f th e s e i s b i a s e d t o c a r ry 5 m A . W h a t i s t h e t d ot al cu r r e nt d r aw n f ro m t h e p owe r s u p p l y w h e n al l th e s e g m e nt s a r e O N ? ( a) 2 d 80 m A (b ) 4 0 m A ( c ) 8 0 m A ( d ) 3 20 m saA 4 . T h e e l e c t r o m e ch an i c a l dm e vi c e w h i ch p r o d u c e s m e ch an i c a l d i s p la c e m e nti n p r op or t i on t o an ap p l i e d vo l t ag e i s k n ow a s ( a) S o l e n oi d ( b ) C o nta c t or a ( c ) Ac t u a to r ( d ) R e l ay x e . 5 . I n a D/ A c onve r te r th e o u tp u t vo l ta g e i s ( a) Vo l t ag e ( b ) P u l s e s ( c ) c u r r e nt ( w d ) R am p) A ( b ) B ( c ) b ( d ) a w 1.Mode1of8255iw susedforwhichoftheseI/Omethods
(a)BiDirectionalHandshake(b)DMAI/O( c ) S t r ob e d or H an d S h ake m o d e (d) SimpleInput/Output 2.Ifthe8255isselectedforaddresses0F800Hto0F806H,whichoneofthefoll owingistheaddressofPORTC(a)0F806H(b)0F802H( c ) 0 F 80 4H (d)0F800H 3.If8sevensegmentledmultiplexeddisplaysincludingthedecimalpointare connected.Howmanywiresareneededtoconnectthesegments(notincludin gpowersupplywires)?(a)15( b ) 1 6 (c)56(d)64

7 . W h i ch o f th e s e i s c a l l e d f o r d o i n g S i n gl e S t e p p i n g ? ( a) I N T 3 ( b ) I N T 1 ( c)I NT0(d)INT2

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4.Thediodekeptacrossthecoilofasteppermotorisfor? ( a) S h o rt i n g t h e B ack E M F (b)Tostopthesteppermotor(c)Stoppingflowofcu rrent(d)Allowingflowofcurrent 5.IntheA/DconverterADC0808whichofthesesignalstristatesthedigitaloutputof ADC(a)EOC(b)ALE(c)SOC( d ) O E 6.Thefourthresponseofthe8086toaninterruptiswhichoneofthefollowing?( a)DecrementstheSPby2&pushesflagregister(b)Itdisablesinterruptflag( c ) D e c r e m e nt s th e S P & p u s h e s c u rr e nt C S c o nt e nt s (d)ResetsTrapFlag 1 . G r o u p A p or t a s s i g n m e nt s o f 8 25 5 i s ( a) Po rt B & L owe r Por t C ( b ) Po rt A & U p pe r Po r t C ( c ) Po rt B & U p p e r Por t C ( d ) Po rt A & L owe r Po r t C 2 . I f t h e c ont r ol wor d 09 B H i s g i ve n t o t h e c ont r ol r e g i s t e r o f t h e 8 25 5 P P I t h e n wh i ch o f t h e s e op t i o n s a r e th e c o n d i t i on o f th e p o r ts ( a) P O RT s A & B I N P U T , PO RT C OU T P U T ( b ) A L L P O RT s OU T P U T ( c ) B I T S E T R E S E T ( d ) A L L P O RT s I N P U T 3 . I f 8 s e ve n s e g me nt l e d n o n mu l t i p l e x e d d i s p l ay s i n c l u d in g th e d e c i m a l p o int a re a l l l i g ht e d u p a n d e a ch o f th e s e i s b i a s e d t o c a r ry 5 m A . W h a t i s t h e t ot al cu r r e nt d r aw n f ro m t h e p owe r s u p p l y w h e n al l th e s e g m e nt s a r e O N ? ( a) 3 20 m A (b ) 2 80 m A ( c ) 4 0 m A ( d ) 8 0 m A

. a 4 . T h e e l e c t r o m e ch an i c a l d e vi c e w h i ch p r o d u c e s m e ch an i c a l d i s p la c e m d e nti n p r op or t i on t o an ap p l i e d vo l t ag e i s k n ow a s ( a) C o nta c t or ( b ) S o l e n oi d ( c d ) Ac t u a to r ( d ) R e l ay a s 1 . T h e 82 55 P P I ha s ( a) 2 8 p i n s ( b ) 1 6 p i n s ( c ) 4 0 p i n s ( d ) 6 4 p i n s m a 2 . T wo 82 55 s I C 1 & I C 2 a rx e c on n e c t e d to 80 8 6 1 6 b i t b u s an d D 0 t o D7 ar e c o n n ec t e d t o I C 1 a n d D 8 t o De 1 5 a re c o n n e c t e d t o I C 2. T h e b a s e a d d r e s s s i g n al s A 0& A 1 go t o I C 1 & I C 2 . s A 0 & A 1 p i n s r e s p e c ti ve l y. I f a d e c o d e d s i g n al w i t h a w r an ge of 0F F E 0H to 0 F F E 3 H t h e n W h a t i s t h e a d d r e s s of I C 1 P O RT B r e g i s t e r w ( a) 0 FF E 2H ( b ) 0 F F E 3H ( c ) 0 F F E 1H ( d ) 0 F F E 0H w 3 . A ke y b o ar d i s m a d e u s i n g 1 2 ke y s c o n n e c t e d n ot a s a ma t r i x. H ow m any p i n

sof t h e I / O p o r t ar e u s e d ? ( a) 1 2 ( b ) 0 7 ( c ) 0 9 ( d ) 1 1 4 . H ow m a ny w i re s d o e s a s t e p p e r m ot or e ff e c t i ve l y h ave ? 2 ( c ) 3 ( d )5 5 . A n A / D c o nve r t e r w h i ch h as a m a xi mu m o u tp u t d i g i ta l va l u e of 1 0 23 n e e d s h owm any w i r e s f o r c o n n e c t i n g i ts d i g i ta l o u t p u t t o a p e r i p h e r al ch i p ( a) 1 0 ( b ) 1 3( c ) 8 ( d ) 1 2 1 . T h e nu mb e r of p o r ts 8 25 5 P P I h as i s ( a) 3 ( b ) 2 ( c ) 1 ( d ) 4

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2 . W h e n 82 55 p o r t i s to b e r e a d t h e n w h i ch o f t h e s e c o mb i n a t i on s i s va l id ( a) RD= 1 , W R= 0, R E S E T =0 , C S =0 ( b ) R D= 0 , W R= 1, R E S E T =1 , C S =0 ( c ) R D= 0 , W R=1, R E S E T =0 , C S =1 ( d ) R D= 0 , W R= 1, R E S E T =0 , C S =0 3 . W h i ch o f th e s e ke y s w i tch e s i s n on m e ch an i c al c ont a c t ty p e ? ( a) M E C H A N I CA L K E Y S W I T C H E S ( b ) H A L L E F F E C T K E Y S W I T C H E S ( c ) M AG N E T I C RE ED K E Y S W I T C H E S ( d ) M E M B R A N E K E Y S W I T C H E S 4 . H ow m a ny s t e p s p e r r e vo l u t i on d o e s a s te p p e r m o to r i n f u l l s t e p m o d e t ake ? ( a) 2 20 ( b ) 2 00 ( c ) 4 00 ( d ) 3 80 5 . A n A / D c o nve r t e r w h i ch h as a m a xi mu m o u tp u t d i g i ta l va l u e of 1 0 23 n e e d s h owm any w i r e s f o r c o n n e c t i n g i ts d i g i ta l o u t p u t t o a p e r i p h e r al ch i p ( a) 1 0 ( b ) 1 3( c ) 1 2 ( d ) 8 1 . T h e nu mb e r of p o r ts 8 25 5 P P I h as i s ( a) 1 ( b ) 3 ( c ) 2 ( d ) 4

2 . I f t h e c ont r ol wor d 09 B H i s g i ve n t o t h e c ont r ol r e g i s t e r o f t h e 8 25 5 P P I t h e n wh i ch o f t h e s e op t i o n s a r e th e c o n d i t i on o f th e p o r ts ( a) P O RT s A & B I N P U T , PO RT C OU T P U T ( b ) A L L P O RT s I N P U T ( c ) B I T S E T R E S E T ( d ) A L L P O RT sOU T P U T

. a 5 . I n th e A / D c o nve r t e r A D C 0 8 08 w h id ch of t h e s e s i gn a l s i s u s e d s e l e c t a n a na l og i n p u t ch an n e l t o b e d i g i t i s e d ( a) ALE(b)SOC(c)OE(d)EOC d a 6 . T h e s e c o n d r e s p on s e o f t h es 80 86 t o an i nt e r r u p t i s w h i ch o n e o f th e f o l l ow i ng ? ( a) R e s e t s Tr a p F l a g ( b ) m D e c r e m e nt s th e S P by 2 & p u s h e s fl a g r e gi s te r ( c )D e c r e m e nt s th e S P & p u s h e s c u rr e nt C S c o nt e nt s ( d ) I t d i s ab l e s i nt e r ru p a x t fl ag e . 1 . W h i ch o f th e s e i s D ou b l e H an d S h ake ( a) S T B f o l l owe d by AC K ( b ) S T B f o l l w owe d by AC K a n d r e m oval of AC K ( c ) S T B o n l y ( d ) AC K f ol l owe d by S T B w 2 . T wo 82 55 s I Cw 1 & I C 2 a r e c on n e c t e d to 80 8 6 1 6 b i t b u s an d D 0 t o D7 ar e c o n n
ec t e d t o I C 1 a n d D 8 t o D 1 5 a re c o n n e c t e d t o I C 2. T h e b a s e a d d r e s s s i g n al s A 0& A 1 go t o I C 1 & I C 2 s A 0 & A 1 p i n s r e s p e c ti ve l y. I f a d e c o d e d s i g n al w i t h a r an ge of 0F F E 0H to 0 F F E 3 H t h e n W h a t i s t h e a d d r e s s of I C 1 P O RT B r e g i s t e r ( a) 0 FF E 2H ( b ) 0 F F E 0H ( c ) 0 F F E 3H ( d ) 0 F F E 1H 3 . A ke y b o ar d i s m a d e u s i n g 1 2 ke y s c o n n e c t e d as a m at r i x o f 4 X 3 . H ow m any p in s of t h e I /O p o r t ar e u s e d ? ( a) 1 2 ( b ) 0 9 ( c ) 0 7 ( d ) 1 1 4 . H ow m a ny s t e p s p e r r e vo l u t i on d o e s a s te p p e r m o to r i n f u l l s t e p m o d e t ake ? ( a) 2 00 ( b ) 4 00 ( c ) 3 80 ( d ) 2 20

3 . A ke y b o ar d i s m a d e u s i n g 1 2 ke y s c o n n e c t e d n ot a s a ma t r i x. H ow m any p i n sof t h e I / O p o r t ar e u s e d ? ( a) 1 2 ( b ) 0 7 ( c ) 1 1 ( d ) 0 9

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5 . A n A / D c o nve r t e r w h i ch h as a m a xi mu m o u tp u t d i g i ta l va l u e of 1 0 23 n e e d s h ow m any w i r e s f o r c o n n e c t i n g i ts d i g i ta l o u t p u t t o a p e r i p h e r al ch i p ( a) 1 2 ( b )10(c)8(d)13 1 . M o d e 1 of 82 55 i s u s e d f o r w h i ch o f t h e s e I / O m e t h o d s ( a) S i m p l e I n p u t/ O u tp u t ( b ) D M A I /O ( c ) B i - D i re c t i on a l H a n d s h ake ( d ) S t r ob e d or H an d S h ake mo d e 2 . T wo 82 55 s I C 1 & I C 2 a r e c on n e c t e d to 80 8 6 1 6 b i t b u s an d D 0 t o D7 ar ec o n n e c t e d t o I C 1 a n d D 8 t o D 1 5 a re c o n n e c t e d t o I C 2. T h e b a s e a d d r e s s s i g n al s A 0 & A 1 go t o I C 1 & I C 2 s A 0 & A 1 p i n s r e s p e c ti ve ly. If adecode d s i g n al w i t h a r an g e of 0F F E 0H to 0 F F E 3 H t h e n W h a t i s t h e a d d res s of I C 1 P O RT B r e g i s t e r ( a) 0 F F E 2H ( b ) 0 F F E 0H ( c ) 0 F F E 3H ( d ) 0 F F E 1H 3 . I f 8 s e ve n s e gm e nt l e d mu l ti p l e xe d d i s p l ay s i n c l u d i n g t h e d e c i m a l p oi nt ar e a l l l i g hte d u p a n d e ach o f th e s e i s b i as e d t o c a rr y 5 m A . W h at i s t h e t o t al c u rr e nt dr aw n f r o m t h e p owe r s u p pl y w h e n a l l t h e s e g m e nts a re O N ? ( a) 2 80 m A ( b ) 8 0 mA ( c ) 4 0 m A ( d ) 3 00 m A

. t oi s f o r ? ( a) S t op p i n g fl ow o 4 . T h e d i o de ke p t a c r os s t h e c oi l o f a s t e p p e r m o t or fc u rr e nt ( b ) To s t op th e s t e p p e r m ot o r ( c ) A l l ow i n p g fl ow o f c u r re nt ( d ) S h o rt i n s g t h e B ack E M F/ 35Y g o 5 . I n th e A / D c o nve r t e r A D C 0 8 08 w h i ch of t h e s e s i gn a l s tr i s t a t e s t h e d i gi t a l l o utp u t of A D C ( a) O E ( b ) S O C ( c ) E O C ( d ) b ALE . a 6 . T h e f o u rt h r e s p on s e o f t h e 80 86 t o an i nte rr u p t i s w h i ch o n e of t he f o l l ow i n g d ( a) D e c r e m e nt s th e S P by 2 & p u s h e s fl a g r e gi s te r ( b ) R e s e t s Tr a p F l a g ( c ) I t d di s ab l e s i nt e r ru p t fl a g ( d ) D e c r e sam e nt s th e S P & p u s h e s c u rr e nt C S c o nt e nt s m a x e . w w w

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