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本帖最后由 独孤键客 于 2011-2-11 10:04 编辑
毋庸置疑,对专业人士来说,当然是ps/2口好。这也是为何要求严格的工控主板都会优选ps/2键盘接口而不是usb的原因。
引用能找到到的最好解释:
PS/2 or USB?
PS/2 wins on three fronts: First, it supports full n-key rollover. Second, PS/2 keyboards aren't polled, but are completely interrupt based. And third, it is impossible for it to be delayed by the USB bus being used by other devices. There are two types of USB transfer modes - the interrupt transfer mode (USB polls keyboard, when key is sensed the USB controller sends the interrupt to the CPU), and the isochronous transfer mode, which reserves a certain amount of bandwidth for the keyboard with a guaranteed latency on the bus. Unfortunately, there are absolutely no keyboards made that use the latter, because special controllers would have to be used, thus making it cost prohibitive.
So if your keyboard supports both PS/2 and USB, and your PC has a PS/2 port, there's no reason not to use it.
但usb在功能上有很大的便利性,比如键鼠合一、即插即用等。。。
当然在一般情况下,上述缺点可以忽略。 |
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