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Describe Real and protected mode:
Operation of Real mode interrupt: When microprocessor completes executing the current instruction, it concludes whether an interrupt is active by checking (1) instruction execution, (2) single -step, (3) NMI, (4) co-processor segment overrun, (5) INTR and (6) INT instruction in the order presented. If one or more of these interrupt conditions are present, following sequence of events takes place:
1. Contents of the flag register are pushed onto the stack
2. Both the interrupt (IF) and trap (TF) flags are cleared. This disables INTR pin and trap or single-step feature.
3. Contents of the code segment register (CS) are pushed onto the stack.
4. Contents of the instruction pointer (IP) are pushed onto the stack.
5. The interrupt vector contents are fetched and then placed into both CS and IP so that the subsequent instruction executes at the interrupt service procedure addressed by the vector.
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Draw a neat labelled diagram of the OSI reference model for computer networks showing all the layers and the communication subnet boundary. The computer network consists of all
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#what is decoders? explain with diagram
Using a combination of uniselectors and two motion selectors draw a schematic of thousand line exchanges. The schematic diagram for such an exchange is demonstrated in Fig. All
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WHAT IS CPE
Common channel signalling in SS7 is (A) out band control channel. (B) In band control channel. (C) Speech control channel. (D) None of the above. Ans:
Explain clearly the four stages in the Rapid Application Development
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