JPS5940692A - Scroll control 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] [Technical Field of the Invention] The present invention relates to a CRT that displays image images such as graph displays.
The present invention relates to a scroll control method suitable for use in displays.

[Technical background of the invention and its problems]

Electronic training system & ν machine system (The device configuration in the second section consists of arithmetic and control unit, main storage device, input/output device, external storage device, etc.). It has a 'l' display, and usually displays 40 characters x 25 lines on one screen.

However, the data display R used in general business is not limited to this amount, and a much larger amount is required. As a means for this purpose, a screen scrolling function is used between a plurality of lines to continuously change the screen size. Conventionally, the above-mentioned scrolling has been realized by moving the current display and then rewriting the data in the scroll start line to all the space data.

FIG. 1(-) shows an example of display data before and after scrolling; FIG. 11 shows a flowchart of a conventional scrolling process and an example of changes in screen display resulting from the process; A is the display screen before scrolling;

B is the display screen after screen movement, C is 4IAI of the front screen after scrolling? Show T.

According to this example, the display of the scroll start line is HHH
H...→AAAA...→Changes to space, then B in the middle
O”: Flickering is felt because the display is present.

Especially 11 image images such as graph processing? Display TruCR'
In i'/f display C2, it takes a considerable amount of time to convert the data in the scroll start line, and furthermore, the display before the scroll processing remains for a moment.

There was a drawback that the opening of the image was difficult to achieve.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned drawbacks, and it is an object of the present invention to provide a scroll control method that can reduce the burden on the operator's eyes during scroll processing and can quickly perform scroll display.

[Ark of Apology, Key]

Does the present invention scroll more than microprocessor C2? il
l I (+ is made C R'I" display (2), refresh memory (first RAM) is 1 stage 6
A two-line table ($ 2 o) t< AM) is provided,
This line table (- stores the line address, the microprocessor writes data 1: space data for the scroll end line obtained from the refresh memory, and changes the contents of the line table after detecting this clearing operation. So, refresh memory h
8. This is the result of four strokes that move the screen without making any changes.

As a result, scroll processing can be performed quickly without causing the operator to feel flickering of one curved surface.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail using FIG. 3 and subsequent figures.
Ru.

Is Fig. 3 an embodiment of the present invention? FIG. In the figure, No. 3 is a refresh memory in which screen information is stored. A line table 32 is installed before the refresh memory 3, and this line table 32? An address for one display or data HEAD/Wr<l'i'E is supplied to the refresh memory 3 via the refresh memory 3.

Screen addresses (rows) are stored in the line table 32, and when a scroll command arrives from the outside, the contents are changed! You can move the screen by changing the That is, due to the existence of this line table 32, the contents of the refresh memory 31? Screen movement can be realized without changing the house.

33 is an address multiplexer. The address multiplexer 33 includes the microprocessor 34 output and (
The second display controller 35fi3 power is supplied and the display signal g2 output from the first display controller 35 is used for switching. The microprocessor 34 has a built-in control procedure shown in FIG. 4 as firmware, and in addition to performing scroll processing based on this content I: CI<'l' controls the entire display? Host. The display controller 35 interfaces the microprocessor 34 with a CR'l' monitor (not shown) and generates various timing signals necessary for display 1 and 2, as well as generating refresh memory addresses, rask addresses, etc. Note that 36 is an internal bus possessed by the microprocessor 34, and is composed of a plurality of lines for address/data control.

FIG. 4 is a flowchart of a scroll process according to the second aspect of the present invention and an example of changes in screen display caused by the scroll process.

. In the figure, D shows an example of the display screen of scroll iJ, E shows an example of the display screen after clearing the scroll end line, and F shows an example of the display screen after scrolling ends. As is clear from this figure, the scroll start line is displayed as HH11H...
→I don't feel any flickering because it changes with the space. In this figure, A and D1 in the conventional example (=) and C and F in the conventional example are the same display screen.

Hereinafter, one operation of the present invention will be explained in detail.

First, the microprocessor 34 reads the display information of the scroll end line and adds space information only to the portion j2 for which no space has been set. By this operation, the screen display changes from D to E. Here, in the scroll end line of D, no writing is performed in a portion where space information is set in advance.

Next, the line table 32 is changed in order to move the display screen. This is done by the microprocessor 34 decoding a scroll command coming from the outside.

For convenience of explanation, one screen address is from θ to 7,
Table 4 shows the output of the line table 32 when line roll up/down is specified.

(Table) First, in the initial state, data is set in the line table 32 such that the screen address is equal to the output of the line table 32.

When a scroll command arrives from the outside in such a state, the microprocessor 34 (second I) line table 32
Therefore, the contents of the rain table 32 are different from the screen address and become t-notted values.

With this content, the entire screen can be moved by accessing the refresh memory 31.

By updating the contents of the line table 32 in this way, the contents of the refresh memory 32 can be updated. You can move the actual screen display without changing it. With this operation, the screen display changes to E-)F.

〔Effect of the invention〕

As explained above, in the second aspect of the present invention, after the screen is moved, there is no need to erase the data before the movement, so no flicker is felt on the screen. Therefore, the display screen becomes distorted,
The strain on the operator's eyes is reduced. Furthermore, since the above processing step can be omitted, the scrolling processing speed is improved.

[Brief explanation of drawings]

Figure 1 is an f diagram showing an example of display data before and after scrolling, Figure @2 is a flowchart of conventional scroll processing and a diagram showing changes in screen display, and Figure tfJ3 is a block diagram showing an embodiment of the present invention. , and FIG. 4 are diagrams showing a flowchart of scroll processing and changes in screen display according to the present invention. 3... Refresh memory, 32... Line table, 33... Address multiplexer, 34...
Microprocessor% 35...display controller,
36...Internal bus.

Claims (1)

[Claims] +1) One screen of information is displayed in a C R'l' display device that undergoes scroll processing according to the procedure rolled and stored in the control memory. A first RAM for storing data and a first RAM for storing
There is a stage C2 in front of Aλ■, which normally outputs the input display position information as it is, and has 20th) HA to I which converts and outputs the input as long as there is a scroll instruction, and -[ - Is the processor unit space information for the scroll end line obtained from the first RAM when there is a scroll instruction? A scroll control method characterized in that after writing and detecting the end of this writing operation, the screen is moved by changing the contents of the second RAM. (2) The processor unit determines the data obtained by RE A I) the data of the scroll end line from the first RAM, and if there is data other than spaces, it can write that data as space data. Scroll control method according to claim 1, characterized in that: