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Is this just a matter of satisfying your curiosity or is there a practical reason you are putting so much energy into this answering this question? I mean is there a reason you must use a bluetooth keyboard to install the OS?
If you look at the bluetooth section in device manager you will see a "stack" driver as well as the main device driver. In addition, bluetooth devices need to be "paired" with the bluetooth transceiver. To work before widows is loaded all that would have to be done via the firmware somehow.
Not necessarily so. It depends on the motherboard. And if really BT (see below) it depends on how the integrated BT is interfaced with the system. If via an internal USB connection (as most are) you should not need to use a PS2 keyboard or mouse. For sure, most chipsets/BIOS firmware has accepted USB keyboard and mouse input for many many years. That is, 10 years or more! And for sure, most BT devices connect via USB (internally or via a dongle).Without Bluetooth hardware/firmware on the MB you will need to either use a PS2 KB & mouse
Not necessarily so. It depends on the motherboard. And if really BT (see below) it depends on how the integrated BT is interfaced with the system. If via an internal USB connection (as most are) you should not need to use a PS2 keyboard or mouse. For sure, most chipsets/BIOS firmware has accepted USB keyboard and mouse input for many many years. That is, 10 years or more! And for sure, most BT devices connect via USB (internally or via a dongle).
Chipset and motherboard makers don't expect users to have legacy PS/2 keyboards and mice laying around even though most motherboards still support at least one PS/2 port.
Last, it is easy to confuse wireless keyboards (and mice) with BT keyboards (and mice). While BT is a wireless technology, there are many wireless keyboards and mice that don't use BT, but instead use a different RF signal in the same 2.4GHz band.
FTR, I use wireless keyboards and mice on all 5 computers here that use either Gigabyte, ASUS or MSI motherboards. All let me boot into the BIOS (or Safe Mode) without having to connect a PS/2 keyboard. And the reason that works is because the chipset/BIOS firmware knows how to communicate with the USB ports without any special firmware or drivers. And the RF/BT dongles know how to interface their connected devices to that USB interface.
Exactly! That's the whole point of the "Universal" Serial Bus. Chipsets/BIOS software knows how to communicate via USB. It is then up to the connected device to also know how to communicate via USB. Point being, PS/2 would not be needed. At least not in theory. But of course, theory and real-world don't always jive.That's because there is a low level driver built into the firmware for the USB.
The point is, unless there are special features, BT should not need to be standardized beyond what the BT standard already calls for. That is, neither the motherboard, the BIOS should care. They are communicating with USB. After that what matters is the device using BT. And to that - that should not matter either because all keyboards and mice (just like all graphics solutions and monitors) should work at very basic levels at the very initial stages of the HW boot process. Otherwise, no keyboard, mouse, graphics solution or monitor would be of any use with the BIOS Setup Menu or while in Safe Mode.I don't think it is as standardized as USB is.
Of course they do! I have said from the start and repeatedly, "it depends on the motherboard" - which implies chipsets.But the chipsets still come into play.