48) If we use 3 bits in the instruction word to indicate if an index register is to be used and if necessary, which one is to be used, then the number of index registers to be used in the machine will be

49) In a multiprocessor configuration,two co-processors are connected to the host 8086 processor. The two co-processor instruction sets

50) A certain processor supports only the immediate and the direct addressing modes. Which of the following programming language features cannot be implemented on this processor

51) In the absolute addressing mode

52) The programmable interval timer is