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The magic SysRq key is a key combination understood by the Linux kernel, which allows the user to perform various low-level commands regardless of the system's state. It is often used to recover from freezes , or to reboot a computer without corrupting the filesystem . [ 1 ]
A 104-key PC US English keyboard layout with System request circled. System Request (SysRq or Sys Req) is a key on personal computer keyboards that has no standard use. Introduced by IBM with the PC/AT, it was intended to be available as a special key to directly invoke low-level operating system functions with no possibility of conflicting with any existing software.
The most commonly encountered are the "XT" ("set 1") scancodes, based on the 83-key keyboard used by the IBM PC XT and earlier. These mostly consist of a single byte; the low 7 bits identify the key, and the most significant bit is clear for a key press or set for a key release. Some additional keys have an E0 (or rarely, E1 or E2) prefix.
Allow user to press shortcuts one key at a time: ⇧ Shift press 5 times: ⇧ Shift 5 times [28] Hear beep when -lock key pressed: Numlock hold 5 seconds: Stop/slow repeating characters when key is pressed: Right Shift hold 8 seconds: ⇧ Shift hold for 8 seconds [29] [30] [31] Inverse (Reverse Colors) Mode Left Alt+Left Shift+PrtScn: ⌘ Cmd+ ...
The pause command in DOS requests the user to "Press any key to continue." In computing, "Press any key to continue" (or a similar text) was a historically used prompt to the user when it was necessary to pause processing. The system would resume after the user pressed any keyboard button.
The simplest such pairwise independent hash function is defined by the random key, key = (a, b), and the MAC tag for a message m is computed as tag = (am + b) mod p, where p is prime. More generally, k -independent hashing functions provide a secure message authentication code as long as the key is used less than k times for k -ways independent ...
Here is a simplified view of the Mac OS X Tiger system startup on a PowerPC Mac (on an Intel Mac, EFI replaces Open Firmware and boot.efi replaces BootX): Open Firmware activates, initializes the hardware, and then loads BootX. BootX loads the kernel, spins the pinwheel cursor, and loads any needed kernel extensions (kexts). The kernel loads ...
The standard encoding of the keyboard that offers the INT 16 h is a US keyboard. To adapt the coding of the INT 16h to another type of keyboard (for example, an international keyboard), the code must analyze the scan-code of the key pressed, and then perform suitable interpreting.