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Tag Archive for hardware

Why fewer IRQLs in 64-bit, even though an APIC has more interrupt lines?

As x86 computers shifted from 32-bit to 64-bit, they also shifted from using 8259-style Programmable Interrupt Controllers with 8 interrupt lines. (Or two multiplexed PICs for a total of 15 interrupt lines.) Then, if you were to install 32-bit Windows for an operating system, Windows would implement 32 software IRQLs (Interrupt Request Levels) with IRQLs 3 through 26 (or so) being reserved for devices.

How can I send a signal to a program via external hardware

I am trying to find a piece of hardware that will signal a program to start a timer when it is moving and stop when it stops. The hardware can just be a ball that moves and is connected to the computer through USB, I was thinking of something similar to the way a mouse would work. For the programing I would like to use c# or possibly ActionScript with adobe air. I am a web developer and have not had any experience with hardware or drivers and would appreciate any ideas on where to start. Maybe there is some piece of simple hardware out there that I can use to send signals to the computer or some literature of articles for beginners that you can point me to. Thanks in advance

Calculations in Vector Register

How do vector registers work in terms of calculations and alloting data to them ?
Is there a detailed reference available somewhere explaining how vector registers work and how data is fetched from them ?

Commercial product using a GPL OS

we are planning to create a commercial product. The product consists of some MCUs and a small computer (we are developing on a Raspberry Pi at the moment).