Re: HID and USB in General.
"Because [USB] was originally only envisaged for keyboard, mouse, joystick etc to replace Master / Slave Serial, Joystick port, PS/2, and AppleTalk (RS422? RS485) etc Keyboard mouse connector."
Historical notes:
AppleTalk was the name at product launch for Apple's (not exactly*) RS422-based networking system; by the time USB came out, it had been renamed LocalTalk due to EtherTalk doing the same job over Ethernet (one might also mention PhoneNet - AppleTalk/LocalTalk using different connectors/cabling; and TokenTalk).
USB was also meant to replace ADB (Apple Desktop Bus), used for keyboard and mouse - and even some modems - on Macs from the Mac SE and Mac II (both 1987) until being superseded by USB on the first iMac (1998).
* It relied on the abilities of the ZIlog 8530 SCC (Serial Communication Controller) IC, which could do RS422 but when running LocalTalk didn't exactly follow the RS422 standard. IIRC, that is.
Biting the hand that feeds IT
