| 摘要 |
PROBLEM TO BE SOLVED: To simplify a signal transmission path between a plurality of control parts by including a CPU in the second control part. SOLUTION: Command data from a main control part is sent to a CPU via a connector 164a, a data buffer IC 164b, a VDP 165 and the like. Data lines /MZD0-/MZD7 are connected to input terminals A1-A8 of the data buffer IC 164b through a plurality of resistances R12-R19. Output terminals Y1-Y8 of the data buffer IC 164b are respectively connected to input terminals CM[7]-[0] of the VDP 165. A strobe signal line /STB is connected to an input terminal CMSB of the VDP 165 through a direction regulating part 164e. As for a strobe signal, the direction regulating part 164e is also used as a communication direction regulating means. Two series-connected inverter ICs 564e and 664e are used for the direction regulating part 164e, and the logic of the strobe signal once inverted by the prior stage inverter IC 564e is returned into the original state by the post stage inverter IC 664e. |
