3 ms·
Happens all the time with keyboards, which are overwhelmingly running at USB1 low speed (1.5Mbit) despite many of them advertising USB2 or even USB3 sometimes.
by StillBored 5y ago
Happens all the time with keyboards, which are overwhelmingly running at USB1 low speed (1.5Mbit) despite many of them advertising USB2 or even USB3 sometimes. I even found one that was actually USB3 for the built in hub and lighting device, but the actual keyboard was still low speed.
And IIRC it turns out to be legit as the newer specs all say something to the effect that they are fully backwards compatible with the previous version of the spec, as well as any new requirements.
So, yes USB 3.1 "high speed" (aka 480 Mbit) is legal spec wise.
PS: If anyone knows of an actual keyboard that runs at high speed or better, i'm still interested since I have a couple devices that might be nice if they hard keyboards but don't support USB1 low/full speed.
- em3rgent0rdr 5y agoI'm sorry but serious question, why would you need a high-speed for a keyboard? A usb packet for a keystroke is roughly 180 bits (I'm estimating from glancing at https://youtu.be/wdgULBpRoXk?t=1390 https://youtu.be/wdgULBpRoXk?t=1390). So 1.5 Mbit/s low speed could roughtly handle over 8,000 keystrokes per second. Do you really need more keystrokes or finer resolution than that?
- StillBored 5y ago"I have a couple devices that might be nice if they had keyboards but don't support USB1 low/full speed. " Its not about the keyboard, its about the host not supporting USB1 speeds or TTs.
- opan 5y agoThere may be enthusiast mechanical keyboards that use faster ports. My keyboard uses an Elite-C MCU in each half. I've heard some more modern stuff is switching to ARM for the MCUs. Here's a keyboard that uses an ARM MCU: https://github.com/tzarc/djinn https://github.com/tzarc/djinn
- fomine3 5y agoSame story goes for HDMI 2.1 https://tftcentral.co.uk/articles/when-hdmi-2-1-isnt-hdmi-2-1 https://tftcentral.co.uk/articles/when-hdmi-2-1-isnt-hdmi-2-...