8259A PROGRAMMABLE INTERRUPT CONTROLLER …
The interrupts at the IR input lines are handled by two registers in cascade, the Interrupt Request Reg-ister (IRR) and the In-Service (ISR). The IRR is used to store all the interrupt levels which are requesting service; and the ISR is used to store all the interrupt levels which are being serviced. PRIORITY RESOLVER
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A TUTORIAL ON POINTERS AND ARRAYS IN C
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pdos.csail.mit.eduOther PC assembly language books still teach how to program the 8086 processor that the original PC used in 1980! This book instead discusses how to program the 80386 and later processors in protected mode (the mode that Windows runs in). There are several reasons to do this: 1. It is easier to program in protected mode than in the 8086 real mode
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pdos.csail.mit.eduOne is the value of the integer stored there (2 in the above example) and the other the "value" of the memory location, i.e., the address of k. Some texts refer to these two values with the nomenclature rvalue (right value, pronounced "are value") and lvalue (left value, pronounced "el value") respectively.
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