81. The method used to transfer data from I/O units to memory by suspending the memory-CPU data transfer for one memory cycle is called
82. Description of LAHF instruction in 8086 processor
83. The RST 5.5 interrupt service routine starts from location
84. Consider the following statements regarding 8051 microcontroller:
1. The size of RAM in 8051 is 128 bytes.
2. RAM locations 00-1FH are assigned to the register banks and stack.
3. RAM location 20-2FH are available as a place to save byte-sized data.
Which of the above statements are correct?
1. The size of RAM in 8051 is 128 bytes.
2. RAM locations 00-1FH are assigned to the register banks and stack.
3. RAM location 20-2FH are available as a place to save byte-sized data.
Which of the above statements are correct?
85. The total number of memory accesses involved (inclusive of the op-code fetch) when an 8085 processor executes the instruction LDA 2003 H is
86. What is the activity of the microprocessor 8086/8085 when the signals $$\overline {{\text{S}}{{\text{S}}_0}} ,\,{\text{DT/}}\overline {\text{R}} $$ and $${\text{IO/}}\overline {\text{M}} $$ are 1, 0 and 1 respectively in minimum mode?
87. A reserved area in RAM used for temporary storage of data, return addresses and content of registers during subroutine calls and interrupts is called:
88. The 8085 microprocessor instructions with required number of T states are given below. Which pair is correctly matched?
89. Match List-I correctly with List-II and select your answer using the options given below:
List-I (Request)
List-II (Device)
a. Interrupt
1. I/O device
b. Wait
2. DMA controller
c. Hold
3. Memory
| List-I (Request) | List-II (Device) |
| a. Interrupt | 1. I/O device |
| b. Wait | 2. DMA controller |
| c. Hold | 3. Memory |
90. The frequency of the driving network connected between pins 1 and 2 of a 8086 chip must be
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