| 摘要 |
<p>PURPOSE:To effectively utilize a display area on a display screen and to restore and display original display data immediately at need by displaying display data, which are displayed on a display screen, in a small display area temporarily. CONSTITUTION:When a key provided at a key input part 3 is pressed, its key information is applied to an input/output controller 1, coded, and outputted to a processor 6. For example. when the key information is the execution command for a factor management program, the processor 6 reads the target program out of an external storage device 8 through an external storage controller 7 and executes it. When the read program has a menu display in hierarchic structure, a menu controller 9 is driven. The menu controller 9 is connected to the processor 6, a current pointer 10, a control table 11, a menu display graphic memory 5, and further the external storage controller 7. Menu data are converted into video data, which are displayed at a display part 2.</p> |
