Can an RC circuit be used as clock source for 8085?
Answer Yes, it can be used, if an accurate clock frequency is not required. Also, the component cost is low compared to LC or Crystal.

Question What are Hardware interrupts?
Answer TRAP, RST7.5, RST6.5, RST5.5, INTR

Question Which interrupt has the highest priority?
Answer TRAP has the highest priority

What is Tri-state logic?
Answer Three Logic Levels are used and they are High, Low, High impedance state. The high and low are normal logic levels & high impedance state is electrical open circuit conditions. Tri-state logic has a third line called enable line.

How many interrupts are there in 8085?
Answer There are 12 interrupts in 8085.

Question What does Quality factor mean?
Answer The Quality factor is also defined, as Q. So it is a number, which reflects the lossness of a circuit. Higher the Q, the lower are the losses.

What happens when HLT instruction is executed in processor?
Answer The Micro Processor enters into Halt-State and the buses are tri-stated.

What is a Stack Pointer?
Answer Stack pointer is a special purpose 16-bit register in the Microprocessor, which holds the address of the top of the stack.

In 8085 name the 16 bit registers?
Answer Stack pointer and Program counter all have 16 bits.

What are the various flags used in 8085?
Answer Sign flag, Zero flag, Auxillary flag, Parity flag, Carry flag.

Question What are Software interrupts?
Answer RST0, RST1, RST2, RST3, RST4, RST5, RST6, RST7.

Question: Which interrupt is not level-sensitive in 8085?
Answer: RST 7.5 is a raising edge-triggering interrupt.

Question: What are level-triggering interrupt?
Answer: RST 6.5 & RST 5.5 are level-triggering interrupts.

Question: What is the RST for the TRAP?
Answer: RST 4.5 is called as TRAP.

Question: What is Program counter?
Answer: Program counter holds the address of either the first byte of the next instruction to be fetched for execution or the address of the next byte of a multi byte instruction, which has not been completely fetched. In both the cases it gets incremented automatically one by one as the instruction bytes get fetched. Also Program register keeps the address of the next instruction.

Question: Which Stack is used in 8085?
Answer: LIFO (Last In First Out) stack is used in 8085.In this type of Stack the last stored information can be retrieved first.

Question: What are input & output devices?
Answer: Keyboards, Floppy disk are the examples of input devices. Printer, LED / LCD display, CRT Monitor are the examples of output devices.

Question: Julius and Vincent are brothers. "We are born within the same hour," says Julius, "on the same day of the same year." "But," says Vincent, "we are no twins!" How is this possible?
Answer: Julius and Vincent are part of a set of triplets, or quadruplets, or even more. .

Question: What is the difference between primary & secondary storage device?
Answer: In primary storage device the storage capacity is limited. It has a volatile memory. In secondary storage device the storage capacity is larger. It is a nonvolatile memory. Primary devices are: RAM / ROM. Secondary devices are: Floppy disc / Hard disk.

Question: In what way interrupts are classified in 8085?
Answer: In 8085 the interrupts are classified as Hardware and Software interrupts.