JPS5854382A - Scrolling type display system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scroll-type display method that sequentially moves an image on a display screen upward.

In this method, a screen buffer corresponding to the CRT display screen is provided, and the character code stored in the screen buffer is read out, converted into a character pattern, and the character pattern is displayed on the screen of the cough display. When the entire area is filled with character codes and the display screen is filled with characters, it becomes impossible to write the next line of characters and their codes, so in order to make this possible, data is transmitted within the buffer to free up free space. Form.

Conventionally, this free space was used to write the character code of the second line of the screen buffer to the first line, write the character hood of the third line to the second line, and so on, moving each line upward by one line. Because it is created by moving the line so that one line at the bottom is empty, it becomes necessary to transfer all the data upward one line at a time in the buffer each time one more line of character codes is written. data will disappear from the buffer). However, if you move the data line by line in this way, the display screen will also change to the empty bottom line [upwards and upwards by one line μm each time a line of characters is added. If the character code addition speed is as fast as the writing from the CPU, the entire display will constantly flow upwards, which is quite embarrassing.

The present invention aims to improve this point, and its feature is that the character codes sequentially written in the screen buffer are converted into character patterns and displayed on the display screen, and the characters are written in the entire area of the screen. In a display method that performs scrolling in which data is transferred on the buffer and the entire screen of the display is shifted upward when data is moved upwards, when scrolling, n (10≧n≧5) lines are simultaneously transferred upwards on the screen buffer. Transfer is performed, character codes from the bottom n lines on the screen buffer are erased, and character codes on the display screen are simultaneously scrolled upward in n lines to the bottom n lines.
The line is left blank, and then the next n-digit character code is written into the lower n-line area of the buffer vacated by the souffle, and the same scrolling is performed again, and this process is repeated thereafter.

Hereinafter, the drawing will be explained in detail with reference to the illustrated embodiment.

FIG. 1 is an explanatory diagram showing an embodiment of the present invention, in which 1 is a screen buffer, 2 are written areas (hatched areas), and 3 are unwritten areas (white areas). The figure shows how character codes are written in order from the top line to the same screen buffer 1, indicated by (1) to (・), and the display on the CRT display screen (not shown) also corresponds to this. Change. However, what is displayed on the display screen is the character pattern corresponding to the character code. Then, on the display, the beginning of the unwritten area, that is, the position where the next character will be written, is indicated by the arrow. Figure 1 (&) is screen buffer 1
With character codes written in order from the top halfway through, the boundary between area 2 and area 3 accommodates the latest character code. When character codes are further written, the entire area of the buffer 1 is filled with the character codes as shown in Figure 3 (of course, blank areas necessary for forming the manuscript may be included in the middle). The display here in the trench shows that the characters are 1.
The whole thing remains stationary, just adding lines one by one.

In the present invention, when the screen buffer 1 is completely filled with character codes, scrolling for Kn digits is performed at once.

Figure 1 (,) shows the wrinkled scroll in its normal state, and Figure 1 (b)
Already written area 2 from the top (* + 1) line to the last line
All of the data in b are transferred three lines upward and stored in the area from the first line to (n+1) lines from the bottom of the screen buffer.

The transfer procedure is to transfer the character code of the (n+1)th line from the top of the screen buffer to the first line, and the character code of the (m+2)th line from the top of the screen buffer to the second line.
To the line... written area 2 of the same figure (b)
The data in the first to nth rows of 1 disappear from buffer 1. Data is not transferred to area 3 in the lower n rows of buffer 1, and it is the same as the lower n rows in the edge written area 2b in the same figure. Therefore, as it is, the lower n rows on the display screen
The gender characters are displayed overlappingly in the bottom 2m rows, and there is no empty area, so to avoid this inconvenience, the bottom 1
Erase the character code of the line. By summing in this way, the area 3 of n rows at the bottom becomes blank, character codes to be input thereafter are sequentially written into the area 3, and characters are sequentially written into the n character areas at the bottom on the display screen. If you write the code for the digits of screen buffer area S I/cn lines (d)
If you scroll 1 and n lines like this, it will look like (,). Here, 2a' is an area in which data has been written that will be lost during the second scroll, and this corresponds to the first nine lines of area 2b. Further, 2b' is an area in which data that has been transferred upward by n lines and remains in the buffer 1 has already been written.

When performing the multi-line scrolling described above, (C) to (d)
Since the data in the written area 2b does not change at all during the transition to , most of the tables on the display appear stationary during that time. For example, when the writing speed from the CPU to buffer 1 is 1200B, if you scroll 5 lines (n=5), 2.5 seconds (5 seconds if H=10) will take area 2b.
The characters corresponding to the data can be kept stationary,
Characters are easy to read. The number of lines on the entire screen should be 20 to 30 lines, and it is preferable that most of the characters remain on the screen even when scrolling, so the number of lines to be scrolled at one time is n.
A value of 5 to 10 is appropriate. On the other hand, in conventional scrolling, since ld n = 1, the entire display screen moves upward every α5 seconds, and in reality it is not easy to read the 0 character, which appears to be flowing.

FIG. 2 shows a control flow corresponding to the display on the display. Characters transferred from another device or entered by operating the keyboard are written at the cursor position, but the cursor position is always checked or removed, and if it is off the screen next time, it will scroll 3 lines, then the bottom n lines. is cleared, and if it is within the screen, scrolling is not performed and the screen is simply advanced to the next position.

As described above, in the present invention, since multiple lines are scrolled at once, there is an advantage that the static time of the written portion becomes longer. When inputting characters using a keyboard, the input speed is slow, so scrolling line by line does not make it difficult to see the displayed characters.However, when inputting characters through a communication line, the input speed is fast, and each line Since the scroll is constantly moving, the present invention Fi is particularly effective in such cases.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention, and FIG. 2 is a control flowchart thereof. In the figure, 1#i screen buffer, 2 written areas, and 3 are unwritten areas. Applicant Fujitsu Limited

Claims (1)

[Claims] The character codes that are sequentially written in the screen buffer are converted into character patterns and displayed on the screen of the display, and when characters are written in the entire area of the screen, the data is transferred on the buffer and the entire screen of the display is displayed upward. In a display method that performs scrolling that shifts upwards, when scrolling, data transfer is performed in which n (10≧n≧5) lines are simultaneously shifted upwards on the screen buffer, and character codes from the bottom to n lines on the screen buffer are erased. , scroll n lines of characters on the display screen upwards at the same time, leave the bottom n lines blank, and write the character codes for the next n lines into the lower line area of the buffer vacated by the scrolling. A scroll type display method characterized by performing the same scrolling again and repeating this process thereafter.