5:49 AM
VAAGESWARI COLLEGES
1) What are the different control signals necessary for I/O read and write cycles? Show how these control signals are generated in minimum and maximum modes of 8086.
2) Why 8086 microprocessor is mapped into 2 byte wide banks? What logic levels are found with BHE and A0 when 8086 writes a byte into address 0F0410H?
3) What are the control flags in 8086? Discuss their use.
4) What is the difference between physical address,effective address and offset address? Explain with example how physical address is generated.
5) What is the purpose of ALE,BHE,DT/R and DEN pins of 8086? Show their timing in the system bus cycle of 8086?
6) What are the segmentation registers in 8086? Discuss the purpose of extra segment.
7) Compare flag registers of 8086 and 8085.
8) Draw and explain the registers organization of 8086.
9) Write an ALP to sort the set of given no.’s in Descending order
10) Write an ALP to find the average of two numbers.
11) Write an ALP to multiply 16 bit unsigned no. by an 8 bit unsigned no.
12) Write an ALP to find the sum of given 10 no.s’
13) Explain the pin configuration of 8255 and also explain the I/O modes of operation of 8255.
14) Explain the priorities of DMA requests and explain the interfacing of 8257 with 8086.
15) Discuss in detail the mode control word format of 8257. Explain about each bit representation.
16) Discuss about the following control words of 8255. a) Mode set control word. b) BSR mode.
