Apple-1 Gets $ 213,600 at auction How much would you pay for the first Apple machine ever made? A fan of Apple on Tuesday disbursed $ 213,600 for an Apple-1 when he went to auction at Christie's in London.
set of programming languages?
Does anyone know what has been programmed input / output is not suitable for handling the mouse input and keyboard input in an operating system like Windows? which is used in its place? and how it differs from the programming of O ???????? thanks for taking the time to help:)
It is an excellent article about it here (PDF): http://www.cs.bham.ac.uk/internal/courses/sys-arch/current/lecture11.pdf or if you do not have PDF reader, developed by Google: 3AZFskaNtfbAAJ%%%% 3Awww.cs.bham.ac.uk 2Finternal 2Fcourses-2Fsys% arch% http://74.125.153.132/search?q=cache 2Flecture11.pdf % Scheduled 2Fcurrent + mouse + input + output + & hl = en & gl = UA alternative to the mouse is driven by the disruption of E / S. Mouse is a hardware low bandwidth, but spends much of his time doing nothing (if we do not move the mouse). PIO uses the voting, that is, the CPU periodically checks the mouse for movement. The overhead of this survey can be very high, especially because the mouse still need to check whether or not it has moved. Therefore we Powered by the interruption of I / O In interrupt-driven IO, the CPU must check the hardware only when there is an IRQ (interrupt request) with the mouse. Thus, in an interrupt-driven IO, the CPU needs to initiate communication with the mouse only when the mouse IRQ is set. I could not explain how IRQ works here, but it's basically a request from another hardware for the CPU to stop what you are currently doing and run a special block of code called driver interruption (which, as you can imagine, going to the E / S for the mouse). With the discontinuation of E / S disk, the mouse will only be checked when movements, the CPU to do a lot of useless. the saving work of an increasingly sophisticated method is the DMA (Direct Memory Access), but DMA is used primarily for high bandwidth and hard disk or graphics card or network card. I think that a simple hardware such as mice require much sophistication programming. In fact, this has nothing to do with the set, and much more to do with the hardware.
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