JPS63153582A - Graphic display 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 Field of the Invention The present invention relates to a graphics control device that is a component of an information processing device, and particularly to a graphics control device that is a component of an information processing device, particularly when two or more graphics control devices share seven display devices. 2. The present invention relates to a method for controlling which output signal from a graphics control device is displayed on a display.

2. Description of the Related Art Conventionally, when there is one or more graphics control devices of this type, each graphics control device is connected to a display device and a keyboard.

Problems to be Solved by the Invention In the above-described conventional graphics device consisting of a graphics control device, a display device, and a keyboard, when two graphics devices with different functions are incorporated into a system, each One or more sets of control device, display device, and keyboard are required for each set, which increases costs and makes it difficult to unify operations when each keyboard has a different key arrangement, making it difficult to operate. There is.

The present invention has been made in view of the above-mentioned conventional situation,
SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a novel graphics display control method which makes it possible to overcome the above-mentioned drawbacks inherent in the prior art.

Means for Solving the Problems In order to achieve the above object, a graphic display control system according to the present invention includes an analog switch for switching analog signals output from one or more graphics control devices, and a skeleton analog switch. The device is equipped with a keyboard for issuing switching instructions.

Embodiment Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

Referring to FIG. 7, a graphics control device 1 includes a graphics control section 3 that executes various graphics controls, a D/A converter ja4In for digital-to-analog conversion, and a receiver 6a. The graphics control device includes a graphics control unit that executes various controls, a driver 7a, and a D/A for digital-to-analog conversion.
It is composed of a driver 'a' and a receiver 10&. The graphics control unit 1 and the graphics control unit 7 are the same only in the interface conditions after D/A conversion), and the graphics control units 3.4t are each configured to control different functions. The keyboard /l is shared by graphics controllers l and co. The analog switch/co is composed of switches SW/~SWn, and the switches SW/-SWn are respectively ja or t.
a,...Switch between 3n and In. Display device/3 is shared by graphics control device 7 and co.

Next, to explain the control method, assume that each switch SW/-SWn of analog switch/2 is currently connected to side a. In this situation, the keyboard/l 1
When one predetermined function key PF/ (not shown) is pressed, the generated code of graphics control unit II<function key PFt is input via the recipe lOa. When the generated code of the function key PFi is an instruction code for switching the display on the display device 13 from the graphics control device l to the graphics control device l, the graphics control unit da is the driver 9
Each switch SW/ of the analog switch saw via a
-Instruct each contact of SWn to switch to fi-4b. R, which is the color signal of the graphics controller
lG, B, H-5ync, V-5ync
Each signal line is input to the display device 13 as an analog signal via the D/A converter ffa-In, and -
A signal generated by R/G/B signals is displayed on a cathode ray tube.

In addition, input signals corresponding to each key from the keyboard // are sent to the driver 7 by the graphics control unit interpreting the function key PFt code and storing the switching instruction.
By not activating the signal line to the graphics controller l via a, the keyboard signals are used only by the graphics controller l.

Next, each switch SWl~SW of the analog switch saw
With the n connected to the b side, the keyboard/
When a predetermined function key PFJ (not shown) other than / is pressed, the generation code of the function key PFJ is input to the graphics control unit via the receiver 10a. The graphics control unit controls each switch SW of the analog switch l via the driver 9a.
/~Instruct each contact of SWn to switch to l) -451. Graphics control device/12) Color signals R, G, B, H-8yncV-5ync
Each signal line is D/A:f:/verter ja%
Display device/JK with analog signal via jn
A signal generated as an R/G/B signal is input and displayed on a cathode ray tube. In addition, input signals corresponding to each key from the keyboard /l are sent to the analog switch /l by interpreting the function key PF code of the graphics control unit II.
By storing the switching instruction of the contact point J to b-4B and outputting it from K via the dry pack a, the switching instruction is sent to the graphics control section 3 via the receiver 6a. is input/entered.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, the present invention provides a graphics control device having different functions by switching analog signals from one or more graphics control devices based on an instruction signal from a shared keyboard. The output signals can be displayed on a shared display device, and the keyboard can also be shared, resulting in cost reduction and improved operability.

[Brief explanation of the drawing]

FIG. 7 is a block diagram showing an embodiment of the present invention. l...Graphics control device, CO...Graphics control device, 3...Graphics control unit, l...
・Graphics control unit, ja-&n...D/A converter, Aa...receiver, ria...driver, za-zan...D/A converter, 9a...driver, toeL ...Receiver, //...Keyboard,
/co...Analog switch, 13...Display IT Patent applicant: NEC Corporation Patent attorney: Yutabe Kumagai

Claims (1)

[Claims] In a graphic display device that shares two or more different graphic display control devices, the graphic display device includes an analog switch and a keyboard for instructing switching control of the analog switch, and the graphic display is controlled based on instructions from the keyboard. A graphic display control method characterized by switching the analog output signal of a control device.