This isn't quite the right group, but I thought it might just be possible that someone would be able to help me - does anyone know what frequency the PS/2 keyboard port is refreshed at? Is it anything close to 1Khz?
Thanks.
Tom
PS/2 Keyboard frequency
Oct 14, 2003
1 Replies
I do not really understand what you mean by "refreshed". If you press a key, the keyboard sends a scan code to the PC (and sometimes on release too). It also receives commands from the PC, like "turn on the NUM-LOCK LED". Other than that, I think it just sits there.
Do you mean the clock rate of the data? I remember the bit period being ~40 microseconds. I found a fair amount of stuff with search engines using "ps2 keyboard protocol". I wrote some microcontroller software to talk to a PS/2 mouse, and used a keyboard for initial testing.
Jeff.
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