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External Hardware-Interrupts
External hardware-interrupts are generated by controllers of external devices or coprocessors and are connected to the processor pin for Non Mask able Interrupts (NMI) or to the pin for Mask able Interrupts (INTR). The NMI line is generally booked for interrupts that occur because of fatal errors like a power distortion or parity error.
Interrupts from external devices may also be associated to the processor via the Intel 8259A Programmable Interrupt Controller (PIC). The CPU utilizes a group of I/O ports to control the PIC and the PIC puts its signals on the INTR pin. The PIC makes possible to enable or disable interrupts and to change the priority levels under supervision of a program.
The instructions CLI and STI may be utilized to enable/disable interrupts on the INTR pin, it has not any effect on NMI interrupts.
this is my first project i dont know where to start
Pin diagram of 8088 : The pin diagram of 8088 is shown in given figure. Most of the 8088 pins and their functions are exactly similar to the corresponding pins of 8086. Hence
Write a procedure to read a text file and copy its contents to another text file using 8086 assembly language .
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Execution Unit (EU) and Bus Interface Unit (BIU) : 8086 consist of two processors called EU and BIU. Two Processors can work parallel. This improves speed of execution. BIU fi
Flag Register : 8086 has a 16-bit flag register which is divided into 2 parts, viz. (a)machine control flagsand (b)condition code or status flags. The condition code flag regi
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