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0:482h                   Keyboard Buffer End Offset Pointer

 Length: 2 bytes

    This word contains the offset of the end of the keyboard buffer plus
    one. This allows you to move the buffer, increase its size, or
    decrease its size. There is one catch, however: The address here is an
    offset starting at address 0:400h. For example, the default 32-byte
    buffer at 0:41Eh forces this offset address to be 003Eh (20h for the
    32-byte buffer itself). Therefore, if the buffer is to be moved to
    another location, the buffer ending offset must be relative to 0:400h.