| 摘要 |
<p>PURPOSE:To change the function of an information processor itself, by securing such constitution in that a control ROM of the main body side is made ineffective and another control ROM within a control module is made effective with the loading of the control module. CONSTITUTION:A control module 19 is inserted into the area where a data module 141 is inserted. A chip selection signal CE2 is usually delivered when the module 141 is inserted. Thus a control ROM12 is selected. While the module 141 is selected when a chip selection signal CE4 is delivered. The other input of an AND gate 22 is set at L level when the module 19 is inserted. Thus the module 19 is selected when the signal DE2 is delivered, and the ROM12 is not selected.</p> |
