1. What is meant by DMA data transfer? DMA stands for Direct Memory Access. In order to transfer bulk amount of data between memory and I/O device without the involvement of CPU, this technique is used. 2. What are the modes of operations supported by 8255? Simple mode Strobed I/O mode Bidirectional mode 3. What is
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1. What are the three basic multiprocessor configurations that the 8086 can support? Coprocessor Configuration Closely Coupled Configuration Loosely Coupled Configuration 2. What do you mean by numeric processor? 8087 is the numeric processor or numeric co-processor. It adds arithmetic, trignometric, exponential and logarithmic instructions to 8086/8088 instruction set for all data types. It supports
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1. What do you mean by non maskable interrupt? Non-maskable interrupt (NMI) is the highest priority hardware interrupt that triggers on the positive edge. This interrupt cannot be disabled or masked. It is used to save program data or processor status in case of system power failure. 2. List out the segment registers of 8086?
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Primary standards : These standards are always fixed standards, single valued. The campbell type of primary standard is shown in fig. It consists of a single layer primary coil of bare copper wire wound under tension in grooves machined in a cylinder of marble. The primary coil is divided into two parts. The two parts
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The secondary standard of Emf is the unsaturated Weston cell. Unsaturated Weston Cell Construction and Characteristics. The construction of an unsaturated cell is shown in fig. The unsaturated cell is similar to a saturated cell except that it does not have the cadmium sulphate crystals (CdSO4). It has the same electrodes but the solution is
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The primary standard of luminous intensity in a full radiator (black body or Planckian radiator) at the temperature of solidification of platinum (2.042°k approximately) under a pressure of 101.325 kN/m². The “candela” is then defined as one sixtieth of luminous intensity per square metre of one full radiator. Secondary standards of luminous intensity are special
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1. How many machines cycles and T-states are needed to execute STA 4200H in 8085 processor? To execute STA 4200H instruction, 4 machine cycles and 13 T-states are needed. Machine Cycles T-states Opcode fetch 4 Memory Read 3 Memory
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Secondary instruments work in two modes: (i) Analog mode, and (ii) Digital mode. Signals that vary in a continuous fashion and take on an infinite number of values in any given range are called analog signals. The devices which produce these signals are called analog devices. In contrast, the signals which vary in discrete steps
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Comparing the advantages and disadvantages of the two types instruments. The accuracy of null type of instruments is higher than that of deflection type. This is because the opposing effect is calibrated with the help of standards which have high degree of accuracy. On the other hand, accuracy of deflection type of instruments is dependent
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In a null type of instrument, a zero or null indication leads to determination of the magnitude of measured quantity. The null condition is dependent upon some other known conditions. In contrast to deflection type of instruments, a null type instrument attempts to maintain the deflection at zero by suitable application of an effect opposing
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