| 摘要 |
<p>PURPOSE:To make necessary operation instructions with the fewer number of key switches by receiving a signal from a remote instruction unit, and generating a numeral corresponding to a key switch operation, and then, controlling the density, magnification, etc., of a display picture in accordance with the numeral. CONSTITUTION:A remote instruction unit MUS is connected with a microprocessor through an interface unit IFA, I/O port, and system bus and further connected with a CRT through a CRT controller. The MUS is equipped with potentiometers VRX and VRY which control horizontal and vertical positional information, respectively, and key switch SWB, and plural key switch groups SWA0- SWA2. Voltages from the VRX and VRY are connected to the AD converter ADC of the IFA, respectively, and each switch is connected to the multiplexer MPX of the IFA to convert into digital values. By operating the SWB, interruption to a CPU is controlled and, by operating the SWA2, density of the CRT display picture, the magnification of display graphics, sound volume of a loudspeaker, etc., are changeovered. Control of the increase and decrease of numerals is performed through the SWA1 and SWA0, respectively.</p> |
