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EE 3750 — Homework 4 due Wed., November 12, 2008 For all problems: state any assumptions made; include comments as needed to make assembly language instruction sequences clear. 1. (a) Brey, Chapter 9, Problem 25 - What is the purpose of the demultiplexed BHE signal on the 8086 microprocessor? (b) Brey, Chapter 9, Problem 32 - Briefly describe the purpose of each T state listed: (a) T1, (b) T2, (c) T3, (d) T4. 2. Write an 8086 instruction sequence to use program-controlled I/O to input words and store the negative-valued words into array under . Input a total of 200 words. Let indev denote the input device. The status port for indev is a byte port at address 4CC2H; bit 3 is the ready bit. The data port for indev is a word port at address 4CC4H. 3. Write an 8086 instruction sequence to work with a simple alarm system using program-controlled I/O. The alarm system receives inputs from a keypad, a door, and a window; it sends outputs to an alarm. Each input and output is to be a single byte, except for the output to
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This note was uploaded on 01/25/2012 for the course EE 3750 taught by Professor Desouza during the Fall '08 term at LSU.
- Fall '08