| 摘要 |
<p>PURPOSE:To simply extend the functions without deteriorating the portability by putting hierarchically the extension boards of desired functions in sequence on a CPU board of a basic part as necessary in order to add the desired functions. CONSTITUTION:A basic part A is available alone. When the extension of a function is desired, an extension board 4 containing a desired function is put on a CPU board 2 of the part A. If the extension of another function is desired, another extension board 4' containing a desired function is put on the precedent board 4. Thus it is possible to easily obtain a computer system exclusive for a user that contains a desired function. Furthermore the portability is never deteriorated since the size of this computer is not substantially changed.</p> |
