| 摘要 |
PROBLEM TO BE SOLVED: To simplify signal transmission routes among a plurality of control sections. SOLUTION: Command data from a main control section are sent to a CPU through a connector 164a and data buffers IC 164b and VDP 165 or the like. Data lines /MZD0 to /MZD7 are connected to input terminals A1 to A8 of the data buffer IC 164b through a plurality of resistors R12 to R19. The output terminals Y1 to Y8 of the data buffer IC 164b are connected respectively to the input terminals CM[7] to [0] of the VDP 165. A strobe signal line/STB is connected to the input terminal CMSB of the VDP 165 through a resistor R20 and a direction regulation section 164e. Also for the strobe signal, as a communication direction regulating means, the direction regulation section 164e is used. In this direction regulation section 164e, two inverters IC 56e and 664e connected in series are used, and the logic of the strobe signal reversed once by the forward inverter IC 564e is returned to the original state by the rear inverter IC 664e. |
