28 Dec
2019
28 Dec
'19
2:25 a.m.
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.
--
Pete
Pete Turnbull