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If more than on IRQ is up at the same time how does the interrupt controller select with to process first?
The priority of interrupts on the 8085 is, in order of decreasing priority, TRAP, RST7.5, RST6.5, RST5.5, and INTR. The priority of interrupts on the 8259 is dependent on the priority mode set by the programmer, it can either be 1.) fully nested mode, where IRQ0 has highest priority, 2.) auto rotation mode, where each has equal priority in a rotating scheme, and 3.) fixed rotation mode, where one is selected as highest by the programmer.
What does an IRQ allow interface cards to do?
IRQ or interupt request : An IRQ allows a device to request certain system resources on priority. Normally, the system allowcates the different non-competing IRQ numbers to different devices. The system allocated IRQs may some times be manually changed. However, it may lead to serious IRQ conflicts resulting in a hung operating system.
Which condition has the highest priority of all injuries?
what is the highest priority of all injuries
Which is the highest priority interrupt for 8051?
The highest priority interrupt in the 8085 is the TRAP interrupt.
Which type of lien has highest priority?
Liens for property taxes have highest priority in a foreclosure regardless of when the lien was filed.
What IRQ does LPT1 usually use?
LTP1 should use IRQ7.
How does the operating system prevent the process from monopolizing a processor?
This is more complex than you know. It is very difficult. The first mechanism is using priority scheduling. Here you start with the "IRQ" - the hardware interrupts where the lower the IRQ, the higher priority. The next is the process priority that the dispatcher use. The OS will be interrupted by the clock, and will then start looking for the highest priority process. Then to avoid all processes to have the same priority, the OS will add / subtract a value depending on "time slice class". The worst you can do is to make a piece of code that is tiny and always executable, like in a tine loop doing very much next to nothing - like reading if a memory location has been changed - a "busy wait". If a process waits for another process to complete, and this indicates the completion in another way than expected, you have it. Like your browser waiting for Java, and you just installed a "security upgrade" of Java.
What is the IRQ for the floppy disk drive controller?
By default, the IRQ for the floppy disk controller is IRQ 6.
What is the Interrupt Request IRQ assigned to LPT1?
By default IRQ 7 is assigned to LPT1.
What is the address of COM1?
From: http://www.techadvice.com/tech/C/ComPort_TS.htmCom1, IRQ 4, address: 3F8Com2, IRQ 3, address: 2F8Com3, IRQ 4, address: 3E8Com4, IRQ 3, address: 2E8
What is the IRQ for a keyboard?
IRQ 1 is used exclusively for the keyboard controller.
What peripheral has the highest interrupt?
The peripheral with the highest interrupt priority depends on the hardware and software design of the particular system. In the 8085, the TRAP interrupt has the highest priority. The peripheral connected to TRAP is your choice.
