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4 char TTY devices 0 = /dev/tty0 Current virtual console 1 = /dev/tty1 First virtual console ... 63 = /dev/tty63 63rd virtual console 64 = /dev/ttyS0 First UART serial port ... 255 = /dev/ttyS191 192nd UART serial port UART serial ports refer to 8250/16450/16550 series devices. Older versions of the Linux kernel used this major number for BSD PTY devices. As of Linux 2.1.115, this is no longer supported. Use major numbers 2 and 3.