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Recent questions tagged memory-mapped
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Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 47 (Page No. 433)
Assuming that it takes $2\: nsec$ to copy a byte, how much time does it take to completely rewrite the screen of an $80\: \text{character} \times \text{25}$ line text mode memory-mapped screen? What about a $1024 \times 768$ pixel graphics screen with $24$-bit color?
Assuming that it takes $2\: nsec$ to copy a byte, how much time does it take to completely rewrite the screen of an $80\: \text{character} \times \text{25}$ line text mod...
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Oct 28, 2019
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tanenbaum
operating-system
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memory-mapped
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Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 3 (Page No. 429)
Figure $5-3(b)$ shows one way of having memory-mapped I/O even in the presence of separate buses for memory and I/O devices, namely, to first try the memory bus and if that fails try the I/O bus. A clever computer ... idea: try both in parallel, to speed up the process of accessing I/O devices. What do you think of this idea?
Figure $5-3(b)$ shows one way of having memory-mapped I/O even in the presence of separate buses for memory and I/O devices, namely, to first try the memory bus and if th...
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Oct 28, 2019
Operating System
tanenbaum
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memory-mapped
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