Babu Madhav Institute of Information Technology, UTU

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1 5 Years Integrated M.Sc.(IT) Semester : DSE3 Microprocessor Programming and Interfacing Question Bank 1. Write an assembly language program to check whether the given number is odd or even. Show the sample calculation. 2. Write an assembly language program to find the cube of 8 bit data. Show the sample calculation. 3. Given the register contents in figure 1, describe the operation and result of each of the following instructions. Assume that the following instructions are independent, not sequential. I. MOV AX, 8642H II. MOV BX, AX III. MUL BX IV. OR CL, BL V. ROR CX, 2 VI. ES = 1000h CS = 2000h SS = 3000h DS = 4000h IP = 5678h VII. AX = 1122h BX = 3344h CX = 5566h DX = 7788h VIII. SP = 4321h BP = 6543h SI = 8765h DI = A987h IX. Register content 4. Describe 8086 binary coding template of MOV instruction. Construct binary code for below instructions. I. MOV [BX], CX II. MOV 87H[SI], DH 5. Write an assembly language program to do BCD subtraction. Show the sample calculation. 6. Write an assembly language program to check whether the given number is bit wise palindrome or not. Show the sample calculation. 7. What are the advantages of using assembly language? Write down equivalent assembly language programming code for below C language code. Ans = 10; For(i=1;i<=5;i++){ If(i<3){ ans++;} Else{ ans--;} } 8. What is the importance of addressing modes? Identify which addressing mode is represented by below instruction and compare them in the context of execution time with diagram. (Diagram can have memory, registers and bus). 1. MOV BL, 08H 2. MOV AX, [3452H] 3. MOV AX, [BX][SI] 4. MOV AX, 50H[BX] 9. Write an assembly language program to count number of 1 s and 0 s in the given number. Show the sample calculation. 10. Write an assembly language program to do BCD addition. Show the sample calculation. 11. Given the register contents in Figure 1, answer the following questions. I. What physical address will the next instruction be fetched from? II. What is the physical address for the top of the stack? III. Register content changed after a) MOV AX, BX b) MOV CX, [1234H] and c) MOV DX, 9999H. (Assume memory content if needed). IV. ES = 1234h CS = 2345h SS = 3456h DS = 4567h IP = 5678h Mr. Sapan Naik 1

2 V. AX = 4321h BX = 5432h CX = 6543h DX = 7654h VI. SP = 1111h BP = 2222h SI = 3333h DI = 4444h VII. Register content 12. Describe 8086 binary coding template of MOV instruction and make it for below instructions. I. MOV CL, [BX] II. MOV CS:[BX], DL 13. Write an assembly language program to transfer values of one array to another array. Array elements are of size 16 bit each. Show sample calculation. 14. Write an assembly language program to find square of a word. Show sample calculation. 15. Draw and explain coding template for MOV instruction in Give any two examples. 16. Differentiate recursive procedure and reentrant procedure. Write a delay loop, which produces a delay of 50 microseconds on an 8086 with 10 MHz clock. 17. Write an assembly language program to shift values in single arrays. Array elements are of size 8 bit each. Show sample calculation. 18. Write an assembly language program to exchange values of two arrays. Array elements are of size 16 bit each. Show sample calculation. 19. What do you mean by reentrant procedure? List out the ways by which one can make any procedure, a reentrant procedure. Write a delay loop, which produces a delay of 100 microseconds on an (Assume data if needed) 20. Describe stack operations during near procedure CALL and RET. 21. Which pin numbers of 8086 represents GND and AD15 signals? 22. Write names of TYPE 1 and TYPE 3 interrupt. 23. Define BIOS Keyboard data area. 24. What is the use of DMA controller? 25. Draw the block diagram of Programmable Interrupt Controller. 26. If an interrupt has been requested, list out the major actions performed by 8086 to respond. 27. List out two function values of INT 16h and INT 10h with their purpose. 28. Write syntax of defining 16 bit array, defining string and finding length of string in 8086 assembly language. 29. Write syntax of finding length of a string in 8086 assembly language interrupt pointer table is stored at which memory location? 31. What is the use of Programmable Interface device - Serial I/O? 32. Write down the name of TYPE 2 and TYPE 4 interrupt. 33. Draw the block diagram of DMA Controller. 34. List out mode of Programmable Peripheral Interface and write use of all modes. 35. List out any two functions of INT 21H for screen interrupt and give example of both. 36. Compare TYPE 1 and TYPE 3 interrupts. 37. What do you mean by BIOS Keyboard data area? 38. Which pin numbers of 8086 represents NMI and READY signals? 39. Write down the name of TYPE 1 and TYPE 4 interrupt. 40. What is the use of Programmable Interrupt Controller? 41. Draw the block diagram of Programmable Interface device - Serial I/O. 42. Differentiate TYPE 2 and TYPE 3 interrupts. 43. Define BIOS Keyboard data area. What is the use of INT 16H interrupt? 44. Which actions are performed by 8086 when interrupt occurs? 45. Write syntax of defining 16 bit array in 8086 assembly language. 46. Write names of TYPE 3 and TYPE 4 interrupt. 47. List out two function values of INT 10h with their purpose. 48. Which pin numbers of 8086 represents CLK and RESET signals?

3 49. Draw the block diagram of Programmable Peripheral Interface interrupt pointer table is stored at which memory location? What is the use of it? 51. How can one use INT 21H for screen interrupt? 52. Which pin numbers of 8086 represents GND,CLK,RESET and AD15 signals? Write use of all pins. 53. What is the use of Programmable Peripheral Interface? 54. Write names of TYPE 1 and TYPE 2 interrupt. 55. List out two function values of INT 16h with their purpose. 56. Write syntax of defining string in 8086 assembly language. 57. Draw the block diagram of DMA Controller. 58. How many interrupt lines are available in Programmable Interrupt Controller? Can it handle nonmaskable interrupts? 59. Differentiate TYPE 3 and TYPE 4 interrupts. 60. What do you mean by BIOS Keyboard data area? What is the use of INT 10H interrupt? 61. Explain 09H, 02H and 40H functions for screen display of INT 21H with example. 62. With help of example, explain two functions of INT 10h and INT 16h in detail. 63. Explain 8237 DMA Controller in detail. 64. List out any four function values of INT 21H and explain each in detail. 65. Discuss INT 10H and INT 16H in detail. 66. Write short note on Programmable Peripheral Interface. 67. What is the use of INT 10H and 16H? Explain with the help of example. 68. Discuss string and array operations in Write short note on Programmable Interface device - Serial I/O. 70. Explain INT 16H and array manipulation for 8086 in detail. 71. With help of example, explain two functions of INT 10h and INT 21h in detail. 72. Write short note on Programmable Interrupt Controller. 73. Explain INT 10H and string operations for 8086 in detail. 74. With help of example, explain two functions of INT 21h and INT 16h in detail. 75. Write short note on 8237 DMA Controller. 76. Write the decimal equivalent for each integral power of 2 from 2 0 to Convert the following decimal numbers to binary: 22, 76, Convert the following binary number to decimal: 1011, , Convert to hexadecimal: 53 decimal, 756 decimal, binary, binary 80. Convert to decimal: D3H, 3FEH, 44H 81. Convert the following decimal numbers to BCD: 86, 62, Define parity and describe how it is used to detect an error in transmitted data. 83. Show addition of: and in binary, and in BCD, 4AH and 77H 84. Express the following decimal numbers in 8-bit sign and magnitude form: +26, -7, -26, Show the subtraction, in binary, of the following decimal numbers. 7 4, 37 26, Show the multiplication of 1001 and Show the division of by Do the indicated operations on the following numbers: 3AH + 94H, 17AH 4CH, BCD, BCD, BCD, BCD, BCD, BCD, BCD, BCD Mr. Sapan Naik 3

4 89. Show the output produced when the following binary words are ANDed with each other and when they are ORed with each other: 1010 and 0111, 1011 and 1100, and ANDing an 8-bit binary number with is sometimes referred to as masking the lower 4 bit why? 91. Describe the main advantage of distributed processing computer system over a simple timesharing system. 92. Describe the sequence of signals that occurs on the address bus, the control bus, and the data bus when a simple microcomputer fetches an instruction. 93. What determines whether a microprocessor is considered an 8-bit, a 16-bit, or a 32- bit device? 94. How many address lines does an 8086 have? 95. How many memory address does this number of address lines allow the 8086 to access directly? 96. At any given time, the 8086 works with four segments in this address space. How many bytes are contained in each segment? 97. What is the main difference between the 8086 and the 8088? 98. Describe the function of the 8086 queue and How does the queue speed up processing? 99. If the code segment for an 8086 program starts at address 70400H, what number will be in the CS register? And assuming this same code segment base, what physical address will a code byte be fetched from if the instruction pointer contain 539CH? 100. What physical address is represented by : 4370:561EH, 7A32:0028H 101. What is the advantage of using a CPU register for temporary data storage over using a memory location? 102. If the stack segment register contain 3000H and the stack pointer register contains 8434H, What is the physical address of the top of the stack? 103. What is the advantage of using assembly language instead of writing a program directly in machine language? 104. Describe the operation an 8086 will perform when it executes ADD AX, BX What types of program are usually written in assembly language? 106. Describe the operation that an 8086 will perform when it executes each of the following instructions: MOV BX, 03FFH MOV AL,0DBH MOV DH,CL MOVBX,AX 107. Write the 8086 assembly language statement which will perform the following operations: Load the number 7986H into the BP register. Copy the BP register contains to the SP register. Copy the contents of the AX register to the DS register. Load the number F3H into the AL register If the 8086 execution unit calculates an effective address of 14A34 and DS contains 7000H what physical address will the BUI produce? 109. If the data segment register (DS) contains 4000H, what physical address will the instruction MOV AL,[234Bh] read? 110. If the 8086 data segment register contains 7000H, write the instruction that will copy the contents of DL to address 74B2CH Describe the difference between the instructions MOV AX,2437H and MOV AX,[2437H] Write pin number of 8086 for a) to enable latch, b) INTA.

5 113. Draw the circuit connections for the 3625 decoder PROM and for two of the 4Kx8 RAMs Show the truth table you would use for a 3625 PROM decoder to produce CSI signals for 4Kx8 RAMs in an 8086 system. Assume the first RAM starts at address 00000H. Do not forget A0 and BHE Trace below program and write registers content after each instruction data segment a. ans db? b. num db 0f1h 118. ends code segment 121. start: a. mov b. mov ds, ax c. mov al, num d. rol al, 02 e. ror al, 03 f. rol al, 04 g. ror al, 05 h. xchg ah, al i. mov ans, ah j. mov ax, 4c00h k. int 21h 122. ends 123. end start 124. Explain 8086 memory banks and describe RAM address decoding on the SDK Differentiate memory mapped I/O and direct I/O Show the truth table you would use for a 3625 PROM decoder to produce CSI signals for eight 8Kx8 ROMs in an 8086 system. Assume the first RAM starts at address 00000H. Do not forget A0 and BHE Draw the block diagram of 8086 memory banks. Explain signals for byte and word operations for the same Explain 8086 memory banks and describe RAM address decoding on the SDK List out ways of accessing I/O. Which way is better in which situation? 130. Show the truth table you would use for a decoder to produce CSI signals for four 8Kx8 ROMs in an 8086 system User does not want to waste memory for accessing I/O. In this situation which method of accessing I/O is preferable and why? 132. Draw the circuit connections for the 3625 decoder PROM and for two of the 16Kx8 RAMS. Show the truth table of address also Write down the name of Type 3 interrupt Where in memory interrupt-pointer table is stored for 8086? Draw the structure of it On which memory locations, the Interrupt pointer table is stored? What is the use of it? 136. List out any two ways of taking input from keyboard and give example of both How to clear screen and set the cursor using interrupt? Describe screen features in detail What is the use of TYPE 2 and TYPE 3 interrupts? 139. Define BIOS Keyboard data area. What is the use of INT 16H interrupt? Mr. Sapan Naik 5

6 140. Draw 8086 interrupt-pointer table. Explain 8086 interrupts and interrupt responses Explain 09H, 02H and 40H functions for screen display of INT 21H with example What is the use of 09H function of INT 21h? 143. Write down the names of Type 0 and Type 1 interrupt How much memory does interrupt pointer table occupy? What is the starting address of TYPE 3 interrupt? 145. List out any functions of INT 21H for screen interrupt and give example of both Explain 8086 interrupt types in detail What is BIOS keyboard data area? Explain interrupt for taking input from keyboard What is the chip number for programmable interrupt controller and DMA controller? 149. Draw internal block diagram of 8255A programmable parallel port device Write short note on 8251 Programmable interface device Serial I/O List out modules of Programmable Interface device. What is the use of data buffer module? 152. Write short note on Programmable Interrupt Controller How many interrupt lines are available in Programmable Interrupt Controller? Can it handle nonmaskable interrupts? 154. Write short note on DMA Controller List out mode of Programmable Peripheral Interface and write use of all modes List the major steps in developing an assembly language program What is the main advantage of a top-down design approach to solving a program problem? 158. Why should you develop a detailed algorithm for a program before writing down any assembly for a program before writing down any assembly language instructions? 159. What are the three basic structure types used to write the algorithm for a program? 160. What is the advantage of using only these structures when writing the algorithm for a program? 161. Use a flowchart or pseudo code to show the algorithm for a program, which gets a number from a memory location, subtracts 20H from it, and outputs 01H to port 3AH if the result of the subtraction is greater than 25H Given the register contents in figure 1 answer the following questions: a. What physical address will the next instruction be fetched from? b. What is the physical address for the top of the stack? ES = 1234h CS = 2345h SS = 3456h DS = 4567h AX = 4321h BX = 5432h CX = 6543h DX = 7654h SP = 1111h BP = 2222h SI = 3333h DI = 4444h Figure 1. Register content IP = 5678h 163. Describe the operation and results of each of the following instruction, Given the register contents show in figure 1 include in your answer the physical address or register that each instruction will get its operands from and the physical address or register. Assume that the following instructions are independent, not sequential, unless listed together under a letter. a. MOV AX,BX

7 b. MOVCL,37H c. INCBX d. MOVCX.[246BH] e. MOVCX,246BH f. ADDAL,DH g. MULBX h. DECBP i. DIVBL j. SUBAX,DX k. ORCL,BL l. NOTAH m. ROLBX,CH n. ANDAL,CH o. AOVDS,AX p. PORBX,CL q. ANDAL,OFH r. MOV,AX,[BX] s. MOV[BX][SI],CL 164. See if you can spot the grammatical (syntax) errors in the following instruction. a. MOVBH,AX b. MOVDX,CL c. ADDAL,2073H d. MOV7632H,CX e. INBL,04H 165. Show the results that will be in the affected registers or memory locations after each of the following groups of the following groups of instructions executes. Assume that each group of instructions starts with the register and memory contents shown in Figure 1. -ADDBL,AL MOV [00041,BL ROR DI, 04 -MOV CL,04 -ADD Al,BH DAA -MOV BX,000AH MOV AL,[BX] SUB AL,CL INC BX MOV [BX),AL 166. Write the 8086 instructions, which will perform the indicated operation. Copy AL to BL. Load 43H into CL Increment the contents of CX by 1. Copy SP to BP. Add 07H to DL. Multiply AL times BL. Copy AX to a memory location at offset 245AH in data segment. Decrement SP by 1. Rotate the most significant bit of AL into the least significant bit position. Copy DL to a memory location whose offset is in BX. Mask the lower 4 bits of BL. Set the most significant bit of AX to a 1,but do not affect the other bits. Invent the lower 4 bits of BL,but do not affect the other bits. Mr. Sapan Naik 7

8 167. Construct the binary code for each of the following 8086 instructions. MOV BL,AL ROR AX,I MOV[BX],CX OUTDX, AL ADD BX,59H[DI] AND AL,OFH SUB[2048],DH NOP XCHGCH,ES:[BX] IN AL,DX 168. Describe how an assembly language program is a developed and debugged using system tool such as editors, assembler, linker, locator, emulators and debuggers Describe stack operations during near procedure CALL and RET What is reentrant procedure? Differentiate reentrant and recursive procedure Differentiate procedures and macros Write instruction format of CALL instruction for inter-segment, indirect call Explain STD, DAS, ROL,JG and CALL instructions with example Define: Indirect inter-segment call List out any two control flags of Explain LEA, ADC, AAA, JL and CMP instructions with example Define: Direct inter-segment jump Describe XCGH, DAA, SBB, ROR and PUSH instructions with example Describe stack operations during near procedure CALL and RET List out different types of Unconditional Jump instructions. Describe 8086 binary coding template of the same What is reentrant procedure? How to make any procedure as reentrant? 182. Define: Indirect intra-segment jump Describe the operation and result of each of the following instructions given the register contains showing figure including your answered register that each instruction will get its operand from enter physical address of register that each instruction can get result in it. user instruction description in chapter 6 to help you assume that the instruction below are independent, not sequential, unless listed together under a letter a) ROLL AX,CX b) IN AL,DXP c) MOV CX,IBX] d) ADD AX,[BX][SI] e) JMP 023AH f) JMP BX 184. Construct the binary codes for instruction for question 15a through 15f Predict the state of the 6 of 8086 conditional flags after each of the following instruction or group of instructions executes. use the registers contents shown in figure assume that all flags are reset before the instruction execute use the detail instruction description in the chapter 6 to help you. a) MOV AL,AH b) ADD BL,CL c) ADD CL,DH d) OR CX,BX 186. See if you can find any errors in the following instruction of group of instructions. a) CNTDOWN : MOV BL,72H DEC BL

9 JNZ CNTDOWN b) ADD CX,AL c) JMP BL d) JNZ [BX] 187. a ) write an algorithm for programmer which adds a byte number from one memory location to a byte from next memory location, put the sum in third memory location and save the state of flag in the least significant bit of a fourth memory location. b) write an 8086 assembly language program for this algorithm. hints: setup data declarations similar to those in figure use of rotate instruction to get the carry flag state the instruction LSD of register or memory location c) what additional instruction would you have to add to this program so that it correctly add 2 BCD bytes? 188. A common problem when reading a series of ASCII characters from a keyboard is the need to filter out those codes which represent the hex digits 0 to 9 and a to f and convert these ASCII Codes to the hex digits they represents. example, if we read 34h the ASCII code for 4. we want to mask upper 4 bits to leave 04, the 8 Bit hex code for 4 if we read in 42h the ASCII for B, we want to add 09 and mask the upper 4 bits to leave 0B, the 8 bit code for hex B. if we read in an ASCII code that is not in the range 30h to 39h or 31h to 36h then we want to load and error code of FFH instead of the hex value of the entered character. Figure 2 shows describe the action next to each range of ASCII values write an algorithm and assembly language program which implements the actions. hints: a nested IF - THEN - ELSE structure might be useful Compute the average of 4 bytes stored in an array in memory 190. Compute the average of any number of bytes in an array in memory. number of bytes to be added is in the first byte of the array Add a five-byte number in one array to a five byte number in another array. put the same in another array. put the state of the carry flag in byte 6 of the array that contains the sum the first value in each array is the least significant byte of that number Based process control system outputs a Measured Fahrenheit Temperature to a display on its front panel. you need write a short program which converts Fahrenheit temperature to Celsius so that System can be sold in Europe the Relationship between Fahrenheit and Celsius is C = (F-32)5/9. the Fahrenheit Temperature will always be in the range 50 to 250. Round the Celsius Value to the nearest degree Write a delay loop which produces a delay of 500us on an 8086 with a 5-MHz delay 194. Write a short program which outputs a 1 KHz square wave on D0 of port FFFAH the basic principle is to output of high, wait 500us (0.5ms.output a low wait 500us output a high etc.) Mr. Sapan Naik 9

Mr. Sapan Naik 1. Babu Madhav Institute of Information Technology, UTU

Mr. Sapan Naik 1. Babu Madhav Institute of Information Technology, UTU 5 Years Integrated M.Sc.(IT) Semester 4 060010402 System Programming Question Bank Unit 1: Introduction 1. Write the decimal equivalent for each integral power of 2 from 2! to 2!". 2. Convert the following