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Systems instructions deal with such functions as: Verification of pointer parameters (refer to Chapter 6): Addressing descriptor tables (refer to Chapter 5):. The Instruction unit decodes the opcode bytes received from the 16-byte instruction code queue memory system of 80386 can be viewed as a 4- byte wide. Part II Systems Programming · Chapter 4 -- Systems Architecture · 4.1 Systems Registers · 4.2 Systems Instructions · Chapter 5 -- Memory Management · 5.1 6.3.5 Some Instructions are Reserved for Operating System. 13.1 80286 CODE EXECUTES AS A SUBSET OF THE 80386 . CHAPTER 17 80386 INSTRUCTION SET. For example, the book shows how an operating system can use the 80386's task switch instruction to dispatch a new task (process), but it does not discuss Segment Registers; Instruction Pointer and Flags; Status and Control Registers; System Address Registers; Debug Registers; Test Registers. Memory OrganizationPresentation on theme: "80386 Instruction Set. to make sure that another processor does not take a control of the system bus 4/13/2019 SCOE/COMP/MA/MPW. instruction fetching, decoding, and executing and memory management. Because of instruction pipelining higher bus bandwidth & on chip address translation. This unit fetches the instructions stored in the memory by making use of system buses. Whenever the system generates a need for instruction then the code