| 摘要 |
A printer which receives image information from host computer 100 and performs printing based on the image information. When option unit 15 is newly attached to the printer, the printer changes the device ID which is selected from ID ROM 9 in accordance with the option unit 15. Then output from interface circuit 1 is changed so that the host computer 100 detects the change of the output from the interface circuit 1. The host computer 100 makes device-ID request to the printer to obtain the device ID corresponding to the optional device. Then the host computer 100 determines whether or not a printer driver which is currently operative corresponds to the printer with the newly-attached optional device. <IMAGE> |
