Hardware problems
- 1. Why the temporary registers W and Z are named so i mean we start from A, B, C, D, E then H and L coz H stands for higher bit and L for lower bit of the address pinted by memory pointer.. but wats W and Z for? Discuss
Correct Answer: As W and Z alphabets are not widely used similarly as W and Z is internally used they would have been named so
- 2. Can 8259 he interfaced with 8085 via the trap pin? Discuss
Correct Answer: Yes so if 8529 gives interrupt then it will be serviced immediately but since INTA pin is left hanging the INSR bit will never be set and so whenever my interrupt occurs depending upon priority it will be serviced also the ISR address for all interrupts will be same ie 0024H Interrupt via trap is nonmaskable, so it will be serviced immediately
- 3. Can RC circuit be used as clock source for 8085? Discuss
Correct 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
- 4. What is the RST for the TRAP? Discuss
Correct Answer: RST 45 is called as TRAP
- 5. what is the clock frequency for 8085? Discuss
Correct Answer: 3MHz is the maximum clock frequency for 8085
- 6. How many interrupts are there in 8085? Discuss
Correct Answer: There are 12 interrupts in 8085
- 7. Name 5 different addressing modes? Discuss
Correct Answer: Immediate, Direct, Register, Register indirect, Implied addressing modes
- 8. Which interrupts has the highest priority? Discuss
Correct Answer: TRAP has the highest priority there are 2 types of interrupts external and internal NMI has highest priority among all external interrupts, TRAP has highest priority among all internal interrupts
- 9. What are software interrupts? Discuss
Correct Answer: RST0, RST1, RST2, RST3, RST4, RST5, RST6, RST7
- 10. what are the hardware interrupts? Discuss
Correct Answer: TRAP, RST75, RST65, RST55, INTR
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