On the PC, the BIOS ( and thus also DOS ) traditionally maps the master 8259 interrupt requests ( IRQ0-IRQ7 ) to interrupt vector offset 8 ( INT08-INT0F ) and the slave 8259 ( in PC / AT and later ) interrupt requests ( IRQ8-IRQ15 ) to interrupt vector offset 112 ( INT70-INT77 ).
32.
:: : This is speculation, but I believe it's because the interrupt vector for Ctrl-Alt-Del already pointed to code that did most of the initialization tasks you would want in a login program, and left the machine in a suitable state for a new user . talk ) 12 : 37, 27 September 2013 ( UTC)
33.
The interrupt vectors corresponding to the BIOS interrupts have been set to point at the appropriate entry points in the BIOS, hardware interrupt vectors for devices initialized by the BIOS have been set to point to the BIOS-provided ISRs, and some other interrupts, including ones that BIOS generates for programs to hook, have been set to a default dummy ISR that immediately returns.
34.
The interrupt vectors corresponding to the BIOS interrupts have been set to point at the appropriate entry points in the BIOS, hardware interrupt vectors for devices initialized by the BIOS have been set to point to the BIOS-provided ISRs, and some other interrupts, including ones that BIOS generates for programs to hook, have been set to a default dummy ISR that immediately returns.
35.
A protected mode OS can also be written for the 80286, but DOS application compatibility was more difficult than expected, not only because most DOS applications accessed the hardware directly, bypassing BIOS routines intended to ensure compatibility, but also that most BIOS requests were made by the first 32 interrupt vectors, which were marked as " reserved " for protected mode processor exceptions by Intel.
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:: This makes me wonder, if you have pins D0 through D7 wired to your volatile chip memory, of course if that just got power, it's not going to have all the interrupt vectors up in high memory and definitely no setup code down at $ FFFC . This is a novice question, but how are volatile chip memory and ROM firmware both wired to the processor ? Preceding contribs ) 12 : 35, 16 October 2011 ( UTC)
37.
On IBM PC compatible computers that use the Advanced Programmable Interrupt Controller ( APIC ), IPI signalling is often performed using the APIC . When a CPU wishes to send an interrupt to another CPU, it stores the interrupt vector and the identifier of the target's local APIC in the Interrupt Command Register ( ICR ) of its own local APIC . A message is then sent via the APIC bus to the target's local APIC, which therefore issues a corresponding interrupt to its own CPU.
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