| 摘要 |
PURPOSE:To easily improve the function of an interface unit by operating a sub-CPU by various programs written in a RAM to realize various interface functions. CONSTITUTION:After programs to realize the functions of various interface units 2, 3,... are loaded from a storage medium 1b to RAMs 2b, 3b,... of various interface units through a main CPU 1a of a main CPU unit 1, sub-CPUs 2a, 3a,... are operated by these programs. Thus, replacement of RAMs or CPUs in various interface units is unnecessary even when the storage medium of the main CPU unit is replaced to improve the function, and the function is easily improved.
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