what is the starting address of ISR？how do we know if both devices issue an interrupt
Added by Albert V.
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An ISR is a special function in a computer program that is executed in response to an interrupt signal from hardware devices. Show more…
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Problem 9. Calculate the 20-bit physical address of Interrupt Service Routine (ISR) for interrupt type B2h using INT command. CS:IP values are stored in the Interrupt Vector Table (IVT) as shown below: ISR entrance of INT 255 For users, 224 interrupts 256 interrupts 0~4 dedicated, 5-31 reserved for system use 08H~0FH 8259A 10H-1FH: BIOS 32~255 reserved for users =20H-3FH DOS 40H~FFH open ISR entrance of INT 32 ISR entrance of INT 31 For system, 27 interrupts ISR entrance of INT 5 ISR entrance of INT 4 (overflow) ISR entrance of INT 3 (breakpoint) ISR entrance of INT 2 (NMI) ISR entrance of INT 1 (single step) ISR entrance of INT 0 (divide error) 5 dedicated interrupts CS IP
Adi S.
"When an interrupt occurs; which of these functions would be the first to occur? the program counter and other registers' values are pushed onto the stack interrupt service routine executed the registers are restored by popping their values off of the stack the processor identifies the source of the interrupt"
Dominador T.
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