JPS6339066B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display control system for efficiently performing a so-called scroll-up function in a display device, particularly in a CRT display device or the like which can display multiple lines on one screen.

In character display devices that display character data, etc., the area to be scrolled (hereinafter referred to as a roll-up field) is generally specified using a keyboard or program for inputting data, and a line feed code is entered at the last line position on the screen. A roll-up function is known in which the entire data in the roll-up field is shifted upward by one line by specifying and outputting .

However, with such conventional roll-up functions, if the last line is a screen consisting of 80 characters, for example, 80 characters are not entered, the roll-up will not be performed and the user will not be able to roll up. , it has the disadvantage that it can only be rolled up by inputting a space code up to the last character position on the last line and inserting and outputting a line feed code.

SUMMARY OF THE INVENTION An object of the present invention is to provide a display control method that can improve operability in order to eliminate the above-mentioned conventional drawbacks.

In order to achieve the above object, in the present invention, a means is provided to automatically generate the line feed code necessary for roll-up when data is input to the line concerned, so that roll-up can be performed automatically. It is.

Examples will be explained below.

FIG. 1 is an explanatory diagram of a display screen according to one embodiment of the present invention, and FIG. 2 is a functional block diagram of one embodiment.

In the figure, 1 is a display section, 2 is a display control section, 3 is a screen memory, 4 is a scroll control section, 5 is a management control section, 5' is an input section, 6A to 6Z are unit processing packages, and 61 is a line feed code output Section 62 is a table. Further, FIG. 1 is a diagram showing a display screen of the display section 1 shown in FIG. 2, and l ₁ to _{l 24} are display lines.

Explain the operation.

First, a processing task is designated from an input unit 5' such as a keyboard or a device that executes a user program.
In response to this designation, the management control unit 5 calls a corresponding processing unit in the unit processing packages (hereinafter referred to as processing units) 6A to 6Z, for example, the processing unit 6A. Note that since the other processing units 6B to 6Z also perform similar operations, only the operation of the processing unit 6A will be described. During the process, the processing section 6A instructs the display section 1 to display operation guidance data. An instruction section (not shown) is provided, and the instruction section causes the data input from the input section to be displayed on the display screen for the corresponding unit process. When specifying a roll-up, the number of the first line to be rolled up, in FIG. 1, the 10th line _l10 is specified from the input section 6A'.

Below, various data are output from the input section.

The management control unit 5 transfers the display control right of the display unit 1 to the processing unit 6A, and the management control unit 5 directly transfers the display data and control commands transferred from the processing unit 6A to the scroll control unit 4. The processing section 6A first delivers a data stream in which a line feed code is added to various display data to the memory control section 3'. The memory control unit 3' writes the transferred data into the memory 3.

The memory 3 has a character code storage area 31 corresponding to a character display position on the screen of the display unit 1, and an attribute storage area 32 that stores character code modification information (hereinafter referred to as attribute) corresponding to the storage position. , for each row. For this reason, the memory control section 3' stores display data, that is, character codes and attributes, passed from the management control section 5 in the memory of the corresponding line, and stores them in the next memory when a line feed code is detected.

In addition, the display control unit 2 sequentially reads and scans the memory rows of the memory 3 in synchronization with the display scan of the display unit 1, and selects characters from the character code according to the modification information corresponding to the read character code. It is converted into a pattern and supplied to the display unit 1 for display.

In this way, the character pattern is once displayed on the screen of the display unit 1.

When rolling up, first input section 6
The processing unit 6A is notified of the area to be rolled up from A'. Based on this, the processing section 6A notifies the display control section 3' of the line number to be rolled up.
The display control section 3' calls the rollup control section 4 and determines the memory address of the corresponding first row.

On the other hand, the processing unit 6A calls the table 62,
The process for the data that will be input now will use the identification key data assigned to the current process to determine the minimum number of characters required for one display line in Table 6.
2 is searched and set in the line feed code generation section 61. As display data is input from the input section 6A', the processing section 6A supplies the display data to the display control section 3' via the management control section 5 in the same manner as described above. The display control section 3' is notified of the designation of rollup as described above, and causes the rollup control section 4 to store it in a register (not shown).

When a predetermined number of data for one display line is input, an input end command is issued from the input section 6A', and 1
Enter the end of the data for the row.

The line feed code generating unit 61 of the processing unit 6A calculates the number of characters required for one display line, in the case of a display unit with 80 characters per line as described above, from the value "80", the number of input characters, in the case of FIG. Since there are three characters “F”, “F”, and “C”, the value “3” is subtracted, and the subtracted value is “77”.
Automatically generates 76 space codes and 1 line feed code in response to.

This data stream is delivered to the rollup control section 4 via the management control section 5 and display control section 3'. The roll-up control unit 4 starts roll-up control when detecting the line feed code. That is, in the storage area corresponding to display line _l10 of memory 3,
Store the data in the storage area corresponding to display line l ₁₁ ,
Display line l _i+1 is sequentially displayed in the storage area corresponding to display line li.
The data in the corresponding storage area is stored. Furthermore,
One line of data stored in the roll-up control section 4 is stored in the storage area corresponding to the last display line _l24 . As a result, the last input data is placed in the final display line _l24 , and the data that was already displayed is shifted up.

As described above, according to the present invention, when a predetermined character is input, it is automatically rolled up, so that the operator does not have to input spaces and line feed codes, improving operability.

[Brief explanation of the drawing]

FIGS. 1 and 2 are an explanatory diagram and a block diagram of an embodiment of the present invention. In the figure, 1 is a display section, 2 is a display control section, 3 is a screen memory, 4 is a roll-up control section, 5 is a management control section, and 6A to 6Z are processing sections.

Claims (1)

[Scope of Claims] A display comprising a display device capable of displaying a certain number of characters in one unit display line, and a screen memory storing a display data string corresponding to each display line, the display being read from the screen memory. If a line feed code is detected at the end of the display data that corresponds to the last line of the data string that can be displayed by the display device, the display data string that is already displayed is moved on the screen and the display device In a display control method for displaying, when display data with the minimum number of characters required for a unit display line is input, a processing unit that adds a line feed code to the end of the input display data, and a processing unit that adds a line feed code to the end of the input display data; and a memory control device that writes and processes display data including the line feed data entered into the screen memory, and when a number of display data that is less than the above-mentioned certain number is input, a space code followed by a line feed code is provided in the display data. is added by the processing unit to form a display data string sufficient to the predetermined number, and then stored in the screen memory, and the input data is displayed on the display device.