| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a computer system whereby bus connection with an extension unit is made to be possible when the bus cycle of a computer mainbody is in an execution state. SOLUTION: An analog switch(S) is permitted to intervene in bus signal lines 2 derived at an extension unit 30 side. When the bus signal lines 2 at the extension unit 30 side are pulled-up, a maximal value (high value) is transmitted to the bus signal lines 2 and the minimal value (low value) is transmitted at the time of being pulled-down. Then, after the potential levels of both buses become equal by the transmission of the maximal value or the minimal value, a connection control gate array 23 turns on the analog switch (S). Thus, both bus signal lines are connected without causing a transient phenomenon even when the bus cycle is in the execution state.</p> |
