JPS62159993A - Video tex terminal equipment - Google Patents

Abstract

PURPOSE:To select a display memory displayed on a screen and to selectively display not only a picture previously received but also a latest picture through the prescribe operation by sequentially switching the display memories storing the latest picture information and insuring the contents in other display memories against being modified. CONSTITUTION:Data received by a MODEM 1 is translated by a data processing part 2 and written in the 1st display memory 31 by a display memory write switch 4. Then the contents in the 1st display memory 31 are displayed on a display part 7 through a display memory read switch 5. Whenever a new picture is received, it is sequantially stored in the 2nd display memory 32, the 3rd display memory 33, the 1st display memory 31.... Accordingly the titled equipment stores two pictures, that is, the latest one and the previous one, in the display memories. If pictures other than the latest one are displayed, a picture selection switch 6 is operated to select the display memory read switch 5, whereby any one of pictures stored in the display memories 31-33 is displayed. By instantaneously switching the previously received picture, it can be displayed on the display part 7.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a Videotex terminal device used as a receiving terminal device in a Videotex system such as Captain.

In conventional Videotex systems such as Technology Captain,
One piece of information is often composed of multiple screens. Therefore, the content currently displayed on the screen is related to the previously displayed screen, and in order to understand the content of the currently displayed screen, it is necessary to understand the content of the previous screen. There is a need. However, since the display memory of the conventional Videotex terminal device is limited to only one screen, the previous screen of the currently displayed screen is not retained in the Videotex terminal device. Therefore, the user has no choice but to remember the contents of the previous screen.

Problems to be Solved by the Invention As described above, in conventional terminal devices, the screen received and displayed before the currently displayed screen is not retained in the terminal device, so the previous screen cannot be memorized by the user. If you don't have it, you can sing it. In view of the above-mentioned problems, the present invention provides a videotex terminal device that can display previous screens through predetermined operations.

Means for Solving the Problems In order to achieve the above object, the present invention provides a display memory write switching circuit that is equipped with display memories for multiple sides and automatically switches the display memory for displaying the latest screen in sequence. Only the display memory corresponding to the screen of
−.

The configuration includes a display memory readout switching circuit that can switch and output the display memory corresponding to any screen to the screen without any need.

According to the above-described configuration, the present invention sequentially switches the display memory into which the latest screen information is written and does not change the contents of other display memories, thereby selecting the display memory to display the latest screen information on the screen. Not only the above screen but also previously received screens can be selectively displayed by a predetermined operation.

Embodiment FIG. 1 is a block diagram showing a Videotex terminal device according to an embodiment of the present invention. In FIG. 1, 1 is a modem that receives data from the Videotex line, 2 is a data processing unit that interprets the data received by modem 1 and converts it into content to be stored in the display memory, and 31, 32, and 33 are 1 a first display memory, a second display memory, and a third display memory each holding display data for a screen; 4 a display memory write switch 5 for switching data from the data processing unit 2 to a display memory to which data is to be written; is display memory 31.32,
Alternatively, a display memory reading 5 pager output switch selects the display signal from 33 and outputs the display signal to the display section 6, and 6 is a screen selection switch operated when displaying a screen other than the latest screen on the display section 7. .

The operation of one embodiment of the present invention will be described below. The data received by the modem 1 is interpreted by the data processing unit 2 and written to the first display memory 31 by the display memory write switch 4, and the contents of the first display memory 31 are transferred via the display memory read switch 5. and is displayed on the display section 6. Further, data for the next screen is similarly interpreted by the data processing section 2, written to the second display memory 32 by the display memory write switch 4, and displayed signal of the second display memory 32 by the display memory read switch 5. is displayed on the display section 6. Similarly, each time a new screen is received, 3 display memories 33. 1st
Display memory 31. It is written into the second display memory 32... Therefore, in this embodiment, the latest screen and two previous screens are each stored in the display memory. If you want to display a screen other than the latest one, operate the screen selection switch 6 and select the display memory read switch 6.
By selecting the display memo IJ31, 32.33
By displaying any of the above, the previously received screen can be instantly switched and displayed on the display unit 7.

It should be noted that the configuration may be such that by successively pressing the screen selection switch 6, other previous screens are displayed continuously.

Effects of the Invention As described above, according to the present invention, it is possible to easily configure a Videotex terminal device that can instantly display not only the latest received screen but also previously received screens.

BRIEF DESCRIPTION OF THE DRAWINGS The figure is a block diagram showing a videotex terminal device according to an embodiment of the present invention. 2...Data processing unit, 4...Display memory write switch, 5...Display memory read switch, 6...Screen selection switch, 31・・・・・・
First display memory, 32...Second display memory, 3
3...Third display memory.

Claims (1)

[Claims] A Videotex terminal device such as Captain, which includes a plurality of display memories, a data processing unit that interprets received data, and a display memory write for sequentially writing the data processed by the data processing unit to different display memories. a display memory readout switcher for sequentially switching display signals from the plurality of display memories and supplying the display signals to the display section; and a screen selection switch for controlling the display memory readout switcher; Each time a new screen is received, the display memory write switch is controlled to sequentially switch display memories into which data processed by the data processing section is to be written, and display signals from the plurality of display memories are sequentially transferred to the display memory. By controlling the display memory readout switch so that the display memory is supplied to the display section, the latest screen is normally displayed, and when the screen selection switch is operated, the display specified by the screen selection switch is displayed. A Videotex terminal device configured to control the display memory read switch to display memory on the display section.