| 摘要 |
<p>PURPOSE:To exert write upon a set of ROM groups by one time of operation from the outside by providing plural ROM sockets loading a master ROM and an unwritten ROM and exerting write upon the plural types of ROM by one process. CONSTITUTION:A control part 7 connects a comparator part 9 equipped with a function to pass data signals or to collate both data, and a ROM socket group 10 composed of ROM sockets 11-13 loading the plural host ROM and the unwritten ROM. Between the comparator part 9 and the ROM sockets 11-13, a ROM data bus select part 14 is provided with a function to select and switch a ROM data bus. Then, the data bus with the comparator part 9 is received by three bus select circuit SEL 19 and according to the designation of a bus select signal from the control part 7, one of the three bus select circuits is activated so as to exchange the data with the ROM mounted to the ROM socket. Thus, the write can be exerted upon a set of the ROM groups by one time of operation from the outside.</p> |
