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http://www.techinterviews.com/x86-programming-interview-questions-and-answers x86 programming interview questions and answers By admin | April 16, 2007 What is an interrupt? Which are the hardware and software interrupts in 8086? Mention the priority of interrupts in8086. What is int1, int2, int3? What is NMI interrupt? What is IVT in 8086? What is the size of IVT? Where IVT is located? Which steps 8086 follows to handle any interrupt? What are the types of interfacing? Compare memory interfacing and IO interfacing. What are the types of IO interfacing? What is the difference between direct and indirect IO interfacing? What is the difference between memory mapped IO and IO mapped IO interfacing? What is the difference between DOS and BIOS? What do u mean by handle in simulation of dos copy command? Which functions of INT 21 are used for performing following operations on file- opening, creating, reading, writing & closing the file? Explain the logic of simulation of DOS COPY COMMAND program. What is the difference between .com &.exe programs? What is directive org 100h? Where it is required? What is the size of .com program? How to convert .exe programs to .com programs? What is TSR? How TSR programs are different than normal programs? What is PSP? What is its significance? What is type 0 or divide by 0 error? In TSR what is the significance of the following functions of INT 21h: 35h, 25h, 31h? What are the applications of TSR program? Explain the logic of real time clock TSR program. Explain the logic of ‘div by zero’ TSR program Which parts is transient & residence part of your program? Which are the functions used in RTC & divide by 0 screen saver explain? This entry was posted in General. Bookmark the permalink. Post a comment or leave a trackback: Trackback URL. 8251 USART interview questions and answers By admin | April 15, 2007 What is IC 8251? How many pins does IC 8251 have? What is USART? Why 8251 is called a USART? What is simplex half & full duplex modes of communication? What is the difference between asynchronous & synchronous mode of communication? Explain control word format of 8251? Define frame in asynchronous communication and draw it. Define baud rate. Define bit rate. Define mode word register of 8251 for asynchronous mode.. Define mode word register of 8251 for sync mode.. What is the significance of SYNC DETECT signal in 8251? What is the significance of BREAK DETECT signal in 8251? Define command word register of 8251. Define status word register of 8251. What are the applications of 8251? Whether write operation is possible with status word register? Whether operation read is possible with command word register? What is parity error in 8251? What is over run error in 8251? What is frame error in 8251? What is hunt mode in 8251? Explain block diagram IC 8251? Explain the logic of 8251 program. Explain the interfacing of 8251 with 8086. This entry was posted in Hardware. Bookmark the permalink. Post a comment or leave a trackback: Trackback URL. DAC interview questions and answers By admin | April 17, 2007 What is the IC numbers for DAC that you have used in the lab? Define resolution. What is the resolution of DAC that you have used in the lab? How many pins does DAC IC have? What are the types of DAC? Which technique you have used for DAC interfacing Which type of DAC you have used in the lab? Define all the specifications of DAC. What are the advantages of binary ladder type DAC over weighted resistance type DAC? What are the applications of DAC? Explain block diagram IC 0808? Explain the logic of DAC program. Explain the interfacing of DAC with 8086.