Two dead LK201 keyboards
pete at dunnington.plus.com
Sat Dec 28 04:25:14 CST 2019
On 28/12/2019 01:46, Paul Koning via cctalk wrote:
> I can get one and test it with an Apple keyboard, but that doesn't sound right. There aren't enough wires on a USB connector to allow you to speak the PS/2 protocol. And there are PS/2 to USB adapters (for old keyboards) that are the same size; clearly the old keyboards don't speak USB.
Enough wires? +5V, ground, clock, data vs +5V, ground, D+, D-
Those old adapters are definitely just passive wiring, and were commonly
supplied with dual-standard mice. That's why they're green. I worked
in the IT department of a large university and it caused a lot of
confusion back in the day when they were common, when people expected
them to convert any keyboard or mouse to PS/2, and found they didn't.
They only work with devices that inherently support both protocols.
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