JPS6159481A - Display screen switching 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 display screen switching control system that easily realizes multi-windows.

[Technical background of the invention]

In recent years, there has been remarkable progress in the field of information processing, especially in multiplexing of processing and man-machine interfaces, as seen in office computers, personal computers, work stage computers, etc. A typical example is multi-tasking and multi-window. A multi-window is a system in which multiple windows (documents and drawings) are displayed on a display screen, and interactive processing is performed through them. That is, the multi-window is a function that appropriately divides the apparent display data and displays it on the display monitor.The section from which the display data is cut out is called the window, and the section displayed on the display monitor is called the viewport.

In order to realize multi-windows, it is necessary to store the contents of each window in memory and combine the contents to create a single screen image. A part of the window stored in the microprogram or wire rosic is cut out, and multiple cutout screen images are combined to generate a display screen.

[Purpose of the invention]

The present invention provides a display screen switching control method that enables screen switching without requiring any changes to the existing display control LSI in order to easily realize the multi-window function described above in a display control device that is managed on a character-by-character basis. The purpose is to provide

[Summary of the invention]

The present invention provides a display control device having two or more screens of plain memory in which addresses are managed for each character section, regardless of pit map memory or code memory. f: A memory was added in which plane selection information to be selected and address information for converting and outputting a display address obtained from the outside to an arbitrary address in the plane memory are respectively stored. Then, by displaying screen information of an area in the plane memory selected by the plane selection information and corresponding to the address translation position, multi-window display of an arbitrary area is realized.

As a result, multi-window display can be easily realized without making any changes to the functions of the existing display control device, and performance can be improved with less software overhead.

[Embodiments of the invention]

Hereinafter, embodiments of the present invention will be described in detail using the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention, and shows only the display system of the display control device. The logic for READ/WRITE to each memory by a program is intentionally not shown here because a well-known configuration suffices.

In the figure, 11 is a display controller (CRTC), which uses a commercially available LSI for display control.

Display controller 77 Fj: Generates and outputs character addresses, rask addresses, etc. for display.

In the embodiment of the present invention, the character address is 0 to 199.
It is assumed that linear addresses up to 9 (display screen configuration of 25 lines x 80 digits) are generated and output. Therefore, character address repeat pits are stored in pit map memory plane 1, which will be described later.
2 and attribute memory 15, and the test address 5 bits are commonly supplied to pit map memory plane 12.13.

12 and 13 are pit map memory planes. Each of the pit map memory planes 12 and 13 has a capacity for one screen, and in the following explanation, the former will be referred to as plane #0 and the latter will be referred to as plane #1 for simplicity. Reference numeral 14 is a register that holds a character address supplied from the display controller 11. 15 is an attribute memory. The attribute memory 15 stores display modification control information that can be set for each character section, that is, for each address from 0 to 1999. Examples of display modification control information include blinking, reversing, and color information.

17 is a control memory added according to the present invention. The control memory 17 stores plane selection information (psEL) whose pit format is shown in FIG. The plane selection information can be set for each character section in the same way as the above-mentioned attribute control information. In the figure, pits 10 to 0 indicate character addresses to be displayed when plane #1 is selected, and are don't cares when plane #0 is selected. The highest pit 1 is selection information for planes #O and #1. This plane selection information can also be defined as extended attribute information. In the embodiment of the present invention, @l ON makes plane #0 valid, and 111# makes plane #1 valid.

The explanation returns to Figure 1. A register 18 holds data read out from the memory 17. The register 18 output is input to the highest address (AH) of the bitmap memory planes 12 and 13, and is a normal output and a normal output, respectively.
An inverted output via an inverter 21 is supplied. That is,
When PSEL information is @OIT, plane #0 is “1”
”, plane #1 is selected.Other outputs of register 18 are the address input terminal (AM) of plane #1.
It is connected to the. 19 is a shift register (P/s). The shift register 19 converts the display data of the character screen width read from the planes #O and #1 into serial data, and its output is supplied to the display modification control circuit 20. The attribute control circuit 20 also has register 1.
The output of the attribute memory 15 is obtained as an input via the driver 22, and the serial data output from the shift register 19 is modified for display, and is supplied as a display signal to a display monitor (not shown) via the driver 22.

FIG. 3 is a diagram conceptually showing the multi-window/f-nod 9 function realized by the present invention on a display screen, and (a).
b) shows the screen image, plane #1 shown in (b)
This indicates that the rectangular area portion of is displayed in the rectangular area of plane #O, which is the pace screen. (c) is an example of setting PSEL information when configuring such a screen.

The operation of the embodiment of the present invention will be explained in detail below. In the embodiment of the present invention, since plane #012 is used as the base screen, 1. PSEL information pit 11 is set to 0''. Plane #O is selected by the PSEL signal, and the display stored in plane #O is selected by the display character address supplied via register 14. The data is read out and desired data is displayed via the shift register 19, display modification control circuit 20, and driver 22.

Here, when the PSEL signal becomes 1'', plane #1 is selected, but the address input terminal (AM
) is supplied with the contents of pits 10 to 0 of the PSEL information.

That is, the display character address ld and PSEL information output from the display controller 11 are used to
1 arbitrary address.

This is illustrated in FIG. That is, plane #
If you want to display a rectangle whose pointer (top left address) in 1 is Y in the rectangle area whose pointer is X on the display screen, the program sets PSEL information as shown in (c). As a result, for the display address management output from the display controller 1, data in the area corresponding to address Y in plane #1 is actually read out and displayed.

In the embodiments of the present invention, bitmap memory has been exemplified and explained as plain memory, but the invention is not limited to this, and the same method can be applied to code memory as long as addresses are managed in units of sections. This can be achieved by

〔Effect of the invention〕

As described above, according to the present invention, the program can display any area on another screen as a window in any further area on the real screen by simply manipulating plane selection information in the same way as handling attribute control information. Further, according to the present invention, multi-window display can be easily realized without changing the specifications of existing display control devices.

In addition, the software overhead is small, and performance can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing bit allocation of plane selection information used by the present invention, and FIGS. It is a diagram conceptually showing the multi-window function realized by the invention, and shows screen images (a) and (b), and an example of a set of plane selection information (c) when configuring such a screen. . 1 No. Display controller (CRTC), 12/13
...Bitmap memory plane (plane #O/#
1), 15... Attribute memory, 17... Sen'' memory, 14, 16, 18... Register (6),
21...Inverter.

Claims (1)

[Claims] A plane memory consisting of at least two planes each having a capacity for one display screen, and plane selection information that is set for each character section constituting the display screen and selects one of the plane memories. a first memory for storing;
a second memory configured for each character section and storing address information for converting a display address obtained from the outside into an arbitrary address in the plane memory, and a plane output from the first memory; A multi-window display of an arbitrary area is performed by displaying screen information of an area in the plane memory selected by the selection information and further corresponding to the address position which is the second memory output. Display screen switching control method.