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Technology Stocks : AMD:News, Press Releases and Information Only!

AMD 214.53

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To: Paul Engel who wrote (1632)	10/25/1997 7:30:00 PM
From: Scott D.	Read Replies (3) of 6843

Your keyboard description is pretty close, but when you say, "The CPU reads each bit", you need to clarify that it is the 8042 CPU logic in the chipset that handles this function. The x86 CPU only gets one interrupt per byte of keyboard data. Also, the shift key state is handled by the keyboard driver (or rom code for dos). The keyboard does not give special treatment the shift/control keys. For example, if your keyboard repeat rate is set to max and you hold down a shift key, you get 30 interrupts per second. Cap locks led turns on only because the keyboard driver sends the proper command in response to detecting the cap locks closure. Given that the keyboard/mouse is the least documented legacy pc hardware device, your description is impressive. I wonder if Ali realized this when picking the keyboard? Ali can now explain to us how the mouse works.

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