| 摘要 |
PURPOSE:To execute correct operation procedures again, by recording and holding an inputted guide picture, redisplaying it by tracing the operated picture in reverse, and also correcting the picture to which an input error has been executed. CONSTITUTION:In case redisplay of the previous picture has been requested, an input terminal equipment 6 informs a terminal controller 1 of read-out of the inputted picture information. A level selector 14 of the terminal controller 1 provides its level number to a picture level register 13, and when it is subtracted by ''1'' by a subtracting circuit 15 and is sent to a level deciding circuit 16, an address of a picture queue storage device 5-2 corresponding to the level number of the previous inputted picture information is selected, and the previous inputted picture information is read out from the corresponding address of the picture queue storage device 5-2, and is sent to the input terminal equipment 6. When an error on the picture has been detected, an input of the inputted picture information is informed to the terminal controller 1, and the picture information which has been inputted again is restored in the corresponding address of the picture queue storage device 5-2. |
