JPS6038758B2 - Display hard copy control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control method for a hard copy of a display that displays the contents of a storage device on a screen of a display device and outputs the screen as a hard copy.
In particular, before starting hard copying, the presence or absence of stored content in the storage device is checked, and if there is no stored content, the hard copy operation is stopped, thereby eliminating meaningless operations and wasting time of the hard copy device. It was designed to do so.

In general, hard copy devices do not have very high speeds; for example, hard copy devices that print 1 page per minute
Works even when there is no information on the screen of the display device,
After one minute, a recording sheet with nothing recorded is output, causing the hard copy device to operate meaninglessly, resulting in a waste of time. The present invention has been made in order to solve the above-mentioned drawbacks. In particular, the contents of the display screen (memory contents) are checked before hard copying, and when there is no information on the display screen, the hard copy device is turned off. This prevents unnecessary operation of the machine and waste of time by preventing it from operating. FIG. 1 is an electrical block diagram for explaining one embodiment of the present invention. In the figure, 1 is a display device. The display device 1 is a general CRT display device, and its input signal is This is a common television video signal.

Reference numeral 2 denotes a display control section. The display control section 2 controls the screen of a CRT display, and generally uses a bitmap memory.

One pixel of the CRT corresponds to one bit or a plurality of bits of the bitmap memory, and the display contents on the CRT screen can be changed by rewriting this memory. Furthermore, by reading the contents of this memory and outputting it with a printer, a hard copy device can be created. Reference numeral 3 denotes a hard copy device control section, and the hard copy device control section 3 reads out the contents of the bitmap memory of the display control section 2 in the order in which the blocks are written.

It also synchronizes with the plotter and controls so that it does not print when the plotter is inoperable. 4 is a data detection section, and this data detection section 4 will be described later using FIGS. 2 and 3.

According to the present invention, as shown in the figure, the display device (both graphic type and character type) 1 is provided with a display control section 2 for controlling data input/output from a hard copy device control section 3. When the display control section 2 specifies an address to be viewed on the display device, the data at that address is output. Therefore, in order to check the storage contents of the entire display, if you indicate the address you want to output to the display control section 2, that is, specify the address you want to see on the display device, that data will be output from the display device and the data will be output to the data detection section 2. The data is output to the data detector 4 and checked as described below. Fig. 2 is a circuit diagram for checking whether necessary data is included in all the output data, and Fig. 3 is a time chart for explaining the operation of the present invention. Throughout, reference symbol a is a check signal, b is a data signal,
c represents a no-data signal.

In the circuit shown in Fig. 2, normally, that is, when there is no check signal a, a low level signal is input to the clear (CLR) terminal of DF/F6, so the output of the Q terminal of DF/F6 is at /. It has become. Here, when the copy button is pressed now, the hard copy apparatus control section 3 generates a check signal a (see FIG. 3A) and outputs it to the data detection section 4. The data detection section 4 receives the check signal a and enables the DF'F6, and opens the AND gate circuit 5 to input the data signal b from the display device 1 to the clock (CK) terminal of the DF'F6. make it possible. Now, as shown in Figure 3B,
When there is one or more pieces of data in the display device 1 (see Figure 3 B.b'), the DF/F6 is set by the data (see Figure 3 B.c'), and the no-data signal c goes low. level. When this no-data signal c becomes low level, it means that there is information on the display screen, and when this no-data signal c becomes low level, hard copying is started. Note that FIG. 3C shows a time chart when there is no information on the display device 1, and in this case, the no-data signal c never becomes a low level. Generally, it takes about 1 second or less to output the entire display, although it varies depending on the display. As is clear from the above description, according to the present invention, when there is no information on the display device, a signal with no information can be detected within approximately one second after pressing the copy wholesale button without performing unnecessary operations. Therefore, unnecessary hard copies are avoided, unnecessary machine operations and time wasted.

[Brief explanation of the drawing]

FIG. 1 is an electrical block diagram for explaining one embodiment of the present invention, FIG. 2 is a diagram showing an example of a data check circuit used in implementing the present invention, and FIG. 3 is an electrical block diagram for explaining an embodiment of the present invention. It is a time chart for explaining the operation of the invention. DESCRIPTION OF SYMBOLS 1...Display device, 2...Display control unit, 3...Hard copy device control unit, 4...Data detection unit. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. In a display hard copy device that has a storage device and displays the storage contents of the storage device on the screen of the display device and outputs the screen as a hard copy, the storage contents of the storage device are checked before the start of hard copying. A hard copy control method for a display, which is characterized in that the presence or absence of data is checked and the hard copy operation is stopped when there is no stored content.