The History Of Kyeboard Keyboards are input hardware and don’t have an OS kernel, but their controller architecture evolved
Plan 9 from Bell Labs
Novell NetWare Monolithic, multitasking real-mode (in early versions), later protected mode
Technically not a standalone OS kernel, but a network operating system layer installed on top of MS-DOS or Windows
Zsh is quite comparable to Bash, and in many cases, it's an enhanced version of Bash with additional features
Printers evolved from ancient block printing → mechanical presses → early computer line printers