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VECTOR INTERRUPT

If the interrupt is assigned to any predefined branching address to its ISR it is termed as vector interrupt.

NON VECTOR INTERRUPT

If the interrupt is not assigned to any predefined branching address to its ISR it is termed as non-vector interrupt.

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Q: What is vector and non vector interrupts?
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What is meant by vector in interrupts?

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Where will be the actual address of the subroutine is placed for vectored interrupts?

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What is the interrupt number in 8085 microprocessor and how to find interrupt's vector address?

The 8085 has five interrupts, INTR, RST5.5, RST6.5, RST7.5, and TRAP. It also has eight software interrupts, RST0, RST1, ..., RST7. The INTR interrupt requires a hardware response that is an opcode. Usually, the opcode is either a CALL instruction, in which case the interrupt vector can go anywhere in memory, or it is an RST instruction, in which case the vector is based on a table in low memory. In the case of RST instructions, either directly or via INTR, or the RSTx.5 interrupts, you simply multiply the interrupt number by 8 to get the vector address. The following table presents the vector addresses for all possible interrupts... RST 0 - 00H RST 1 - 08H RST 2 - 10H RST 3 - 18H RST 4 - 20H TRAP - 24H RST 5 - 28H RST5.5 - 2CH RST 6 - 30H RST 6.5 - 34H RST 7 - 38H RST 7.5 - 3CH


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