| 摘要 |
<p>PURPOSE:To decrease the number of terminals of a control microcomputer used in a magnetic recording/reproducing device, by detecting the presence or absence of a miserasion preventing bar with a microcomputer terminal which detects the loading/unloading state. CONSTITUTION:If miserasion preventing bar exists, a detecting switch 18 for presence or absence of the miserasion preventing bar is turned off. Then the input terminals B and C of a control microcomputer used in a magnetic recording/reproducing device depend on the state of a cassette loading and unloading detecting switches 16 and 17 respectively. While in case no miserasion preventing bar exists with the switch 18 turned on, a video recording command switch 19 is operated to set a computer input terminal O at a low level. Thus the terminals B and C are set at a low level respectively regardless of the state of the switches 16 and 17. As a result, no input terminal is required for the detecting signal for presence/absence of the miserasion preventing bar. Accordingly, the number of terminals required for the control microcomputer of a magnetic recording/reproducing device are decreased.</p> |
