NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
JUNE/JULY 2013 EXAMINATION

COURSE CODE:                                                                              CIT411

COURSE TITLE:                                                                             Microcomputers and Microprocessors

TIME ALLOWED:                                                                          2 Hours

INSTRUCTIONS:                                                                            Answer Question One (1) and any other Three (3) Questions

Q1.       Using suitable diagram, draw the Architectural design of an 8085 Microprocessor, indicating at least ten of its components and five of its features.

Q2.       What is Microcomputer Networking? Outline and discuss any five of its various types.

Q3.       Differentiate between the following microprocessor types based on hardware characteristics; RISC, ISC, VLWI & Superscalar, clearly indicating four of their features each.

Q4.a     Differentiate between Opcode and Operand. Clearly stating the differences between them.

      b.   Write out clearly the following logical operation.

                        (i)        SET B 2FH                  (ii)       CLR C              (iii)      CPL 20H        

(iv)      MOV C, 87h                (v)       ANL C, 90h     (vi)      ORL C, 91h

Q5.a     What is an Assembly Language? Outlining four of its benefits.

      b.   Outline and discuss the four addressing modes available to an 8085 microprocessor.

Q6.       Explain the term Interrupt; clearly stating the actions taken by the microcontroller when an interrupt is triggered, enumerating at least five registers that the operation is protecting.