Computer Organization and Architecture Input/Output …
I/O Modules • Peripheral communications are handled with I/O modules • Two major functions: —Interface to processor or memory via bus or central link —Interface to one or more peripherals via tailored data links Generic Model of I/O Module External Devices • Human readable (human interface) —Screen, printer, keyboard, mouse ...
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Computer Organization and Architecture …
aturing.umcs.maine.eduComputer Organization and Architecture Note: Appendix 4A will not be covered in class, but the material is interesting reading and …
Encoding of 8086 Instructions 8086 Instructions are ...
aturing.umcs.maine.edu8086 Instruction Encoding-4 Details on Fields Opcode Byte! opcode field specifies the operation performed (mov, xchg, etc)! d (direction) field specifies the direction of data movement: d = 1 data moves from operand specified by R/M field to operand specified by REG field
Computer Organization and Architecture Micro-Operations
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8086 Instructions 80x86 Instruction Encoding
aturing.umcs.maine.eduREP, REPE, REPZ F3H REPNE, REPNZ F2H • Note that REP and REPE and not distinct Machine (microcode) interpretation of REP and REPE code depends on instruction currently being executed • Segment override CS 2EH DS 3EH ES 26H SS 36H • Lock F0H The Opcode Byte •The opcode field specifies the operation performed (mov, xchg, etc).
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