Keyboard input follows libSceMouse: the video out event loop forwards SDL
key and focus events, whose scancodes are USB HID usages, and the library
keeps the pressed keys, modifiers and lock LEDs in a 16-entry history for
sceKeyboardRead and a snapshot for sceKeyboardReadState.
sceKeyboardGetKey2Char translates the 101-key arrangement; the 106-key
one throws and is listed as technical debt.
KeyboardData holds 16 key codes (96 bytes), not 6.
Co-Authored-By: Claude <noreply@anthropic.com>