JPS599064B2 - Key-in data read-back method for CRT display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for key-in in a CRT display device.
The present invention relates to a read-back method for reading data with a data processing device.

CRT display devices are utilized in a variety of ways as valuable man-machine interfaces in data processing systems.

The CRT display device displays data provided by the data processing device and data provided by the operator through the keyboard. The displayed data given by the data processing device may be rewritten from the keyboard (key-in), but in that case, the data is read back to the data processing device (read back), and the data in the data processing device is Old data needs to be corrected. Conventionally, in such a case, all the data in the refresh memory of the CRT display device is transferred to the buffer area of the data processing device, and it is determined one by one whether the data is key-in data or not.

Therefore, the data processing device requires a buffer area equivalent to the capacity of the refresh memory for read back data, and also requires a considerable amount of programs for read back data processing. It is rare that all of the data displayed on a CRT display device is key-in data; rather, most of it is provided from a data processing device, with only a small portion being key-in data. Therefore, it is uneconomical to prepare a buffer or program for all the data for some key-in data. To avoid such waste, when display data is divided in advance into data that can be keyed in and data that cannot be keyed in, an identification code is attached to the data, and only data that can be keyed in is read based on this code. - There is also a backing method, but this is not preferable because it requires an extra code bit due to the data structure.

An object of the present invention is to enable readback of only keyed-in data or data in a key-in possible area without requiring any special data configuration, and to reduce the burden on hardware and software on the data processing device. The purpose is to provide a back method.

The present invention displays a keyed-in image or a image in a key-in possible area in a predetermined color different from other images, and when reading back, reads back only the image with that color signal. This is how it was done.

The present invention will be explained below with reference to the drawings.

FIG. 1 is a conceptual block diagram of an apparatus to which the present invention is applied.
In FIG. 1, 1 is a digital processing device, 2 is a CRT display device, and both are connected by a digital transmission line. In the CRT display device 2, 201 is a data processing interface that controls data exchange with the data processing device 1.
system refresh memory 204, microprocessor 205, system read-only memory (ROM
) 206, system random access memory (R
AM) 207, and keyboard interface 20
8 is connected. A keyboard 209 is connected to the keyboard interface 208 . CRT control unit 203
provides a control signal to the CRT refresh memory 204, sequentially reads out its contents, and provides them to the CRT 2ll through the CRT interface 210. The CRT interface 210 operates according to a control signal given from the CRT control section 203, and causes the CRT 2ll to generate an image corresponding to the data given from the refresh memory 204. The format of the data in the refresh memory 204 is, for example, as shown in FIG.
Consisting of

The microprocessor 205 processes data within the CRT display device 2 in response to requests from the data processing device 1 or the keyboard 209.

Programs and data for this internal data processing are stored in the system RAM 2O7. Further, the execution procedure of each instruction in the program is stored in the system ROM 206 as a micro program. When data from the data processing device 1 is to be displayed on the CRT 2ll, a data group for one screen is transmitted from the data processing device 1 to the CRT display device 2.

These data groups are stored in the refresh memory 204 through the data processing interface 201, read out by the CRT control section 203, and given to the CRT 2ll, so that an image representing the data is displayed on the CRT 2ll. When the data processing device 1 transmits a data group for one screen to the CRT display device 2, it also sends a code signal specifying the display color of key-in data or the display color of the key-in possible data area.

This code signal is stored in the RAM 2O7 and is used as control data during key-in and read/back. The display color of key-in data is to display only that data when it is keyed in, distinguishing it from others, and is the display color of any data displayed on the CRT before the first key-in. A different color is specified. On the other hand, the display color of the key-in data area is the color used to display the key-in data area when the data group on one screen is divided into key-in data and non-key-in data. . This color is CRT2
It appears on ll from the beginning. These display colors are defined in advance and understood by the operator. These display colors can be changed depending on the screen. When keying in data, the operator operates the keyboard 209 to key in the desired data at a desired position on the screen of the CRT 2ll, or selects the data displayed in the color of the key-in area on the screen of the CRT 2ll. Command rewriting.

Then, microprocessor 205 rewrites the corresponding data in refresh memory 204 based on the request and data from keyboard interface 208. At that time, if the request is key-in, the display color code of the data is changed to the key-in/deno display color according to the control data in RAM2O7. If the request is to rewrite data in the key-in possible area, the display color changes to the key-in data color as well. When the content of the refresh memory 204 changed in this way is displayed on the CRT 2ll, the keyed-in data is displayed in the display color of the previously specified keyed-in data.

When all scheduled data key-ins are completed, the operator operates the keyboard 209 to instruct the data processing device 1 to read/back data.

When this command is given to the data processing device 1 through the data processing interface 201, the data processing device 1
A data transfer command is issued to the CRT display device 2.
Then, the microprocessor 205 follows this instruction and writes data from the refresh memory 204 to RAM2O7.
Only key-in data and/or data in the key-in possible data area having a display color code that matches the control data therein are extracted and transferred to the data processing device 1. The data processing device 1 processes the transferred data and corrects the corresponding old data. As described above, the present invention displays keyed-in data or data in a key-in possible area in a predetermined color different from other data, and when reading back, data with such a color signal is displayed. Now it only reads and backs. Therefore, no special data configuration is required, and only data that is actually keyed in or data that can be keyed in is read back, resulting in a read back that reduces the burden on the hardware and software of the data processing device. Back method can be realized.

[Brief explanation of the drawing]

FIG. 1 is a conceptual block diagram of an example of a device to which the present invention is applied, and FIG. 2 is an example of a data format in a refresh memory.

Claims (1)

[Claims] 1 Display keyed-in data and/or data in a key-in possible area on a CRT display device in a predetermined color different from other data, and when read back by a data processing device, only data with that color signal is displayed. A read-back method that reads and backs.