01․ Inintel 8085A microprocessor ALE signal is made high to
When ALE signal is high all the buses are used as address bus and when it is low lower byte of address bus is used as data bus.
02․ Output of the assembler in machine codes is referred to as
Input to a assembler is the source program and assembler converts it into object program.
03․ Which of the following statements for intel 8085 is correct?
Program counter contains the address of the instruction to be fetched.
04․ A good assembly language programmer should use general purpose registers rather than memory in maximum possible ways for data processing. This is because:
Data processing with registers takes fewer cycle than with memory which require extra memory read or write signal.
05․ Which one of the following is not correct?
Interrupt is required for interruption of main program to perform a subroutine. It may be used at the start of some program as per requirement but it is not mandatory at start of every program.
06․ I)A total of about one million bytes can be directly addressed by the 8086 microprocessor II)8086 has thirteen 16-bit registers III)8086 has eight flags IV)Compared to 8086, the 80286 provides a higher degree of memory protection Which one of the statements given above are correct?
→ 8086 has 9 flags i.e. CF, PF, AF, ZF, SF, TF, IF, DF, OF → 8086 has 20 address lines so it can address 220 = 1Mbyte memory location. → 8086 has thirteen 16-bit registers.
07․ The processor status word of 8085 microprocessor has five flags namely:
8085 microprocessor has 5 status flag S → Sign flag Z → Zero flag AC → Auxiliary carry flag P → Parity flag CY → Carry flag
08․ What are the sets of commands in a program which are not translated into machine instructions during assembly process, called?
Directives are not translated into machine instruction during assembly process.
09․ The cycle required to fetch and execute an instruction in a 8085 microprocessor is which one of the following?
One machine cycle is equivalent to one memory access. Clock cycle implies one clock period. Instruction cycle includes fetching and execution of a given instruction.
10․ In an intel 8085A, which is the first machine cycle of an instruction?
In execution of any instruction first cycle is op-code fetch the memory read or write or I/O read or write cycle occur as per instruction given.