CN1067320A - A kind of new multi-display card switches method - Google Patents
A kind of new multi-display card switches method Download PDFInfo
- Publication number
- CN1067320A CN1067320A CN 91106429 CN91106429A CN1067320A CN 1067320 A CN1067320 A CN 1067320A CN 91106429 CN91106429 CN 91106429 CN 91106429 A CN91106429 A CN 91106429A CN 1067320 A CN1067320 A CN 1067320A
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- display card
- bus
- display
- switch
- control
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Abstract
The present invention is a kind of method of using a plurality of displays to show different content simultaneously on a computing machine.This method is on the computer PC bus and connects several display cards, utilize one to deposit the software control switch that driver constitutes by address decoder and pin, and opening or closing of reading writing signal line realized on the control display card.Advantages such as this method is used for automatical measure and control system, and it is fast to make them have frame updating speed, and the software compatibility is good, and the system development time is short.
Description
The present invention relates to an a kind of microcomputer makes a plurality of displays show the method for different content simultaneously.
In the TT﹠C system that computing machine constitutes, often need to use a plurality of displays to show different contents simultaneously, in order to realize this requirement, generally can adopt multidisplay system's machine or be with two kinds of working methods of a plurality of display cards, wherein the video display terminal function is stronger, but the price height and the software compatibility are relatively poor, and multi-display card (external display CRT) mode price comparison under the situation of said function is cheap, so be subjected to user's welcome.
The method that mostly adopts timesharing to switch when under single user operating system, using a plurality of display card, the method for display card and computer bus transmission data has multiple, can be divided into two classes substantially: the 1st, the I/O command mode.The 2nd, the MEM command mode, the part address space that is about to MEM is directly distributed to the data field of display card, with MEM command transfer information, multi-display system to this two classes display card has corresponding two class changing methods: a class is that the I/O mouth switches method, another kind of is that the MEM mouth switches method, the former general speed is slower, and the software compatibility is poor, and is not too popular; Latter's speed is fast, so it is popular, often adopt address subregion method in the specific implementation, but address subregion method is easy and operating system clashes, the software compatibility is bad, and require display card can change work address, and common display card great majority do not possess this condition, so influenced its versatility.
Want not change the address of common display card and finish the function of using a plurality of display cards in parallel on same bus, also can adopt the bus interface switch to switch method, promptly manage to control getting in touch of display card and computer bus, make the interface of display card and computer bus can show off the state that opens or closes, control the switch of each display card respectively and finish handoff functionality, in the US4755934 patent, adopt data bus (DB) shoulder rotation exactly, control each identical input and output interfaces card.But the AB.CB.DB part to display card it and computer bus all is related, and has the canned data function, so data bus (DB) shoulder rotation is impracticable.
Purpose of the present invention proposes a kind of new bus interface switch exactly and switches method, utilize this changing method, common popular display card more change of address can directly be used for constituting the multi-display computer system, its fast characteristics have not only been kept, the more important thing is and to keep compatible completely with popular software, the speed of system software secondary development is improved greatly.
Basic ideas of the present invention are: manage to control getting in touch of display card and computer bus CB part, as the condition of work of control address code translator or the break-make of the bus driver on the control display card etc., make the interface of display card and computer bus show off the state that opens or closes, finish the handoff functionality of multi-display card.
Signal wire because of computer bus CB part and display card interface in concrete the enforcement has a lot of bars, if they are all controlled is more complicated, but we can find several wherein the most key lines, it is reading writing signal line, as long as controlled this several lines relevant with regard to data exchange waies all between may command computer bus and the display card with read-write, this kind method is the simplest bus interface shoulder rotation, or is called read-write wiretap method.The PC bus is needed only control IOR, IOW, MEMR, these four lines of MEMW get final product.
One embodiment of the present of invention are to constitute a multi-display computer system with read-write wiretap method, its task is achieved in that the simple display card of transforming of a plurality of warps all receives on same computing machine (the using the PC/AT machine here) bus, control them by another one multi-display card controller, make their timesharing ground and computing machine swap data.The multi-display card controller is exactly that an input end of depositing this software control switch of software control switch that driver constitutes by address decoder and pin links to each other with computer bus, the IOR of each display card is received in its a plurality of outputs, IOW, MEMR is on the control end G of the three-state driver of four signals of MEMW.
Its concrete structure can be given to describe in detail with reference to the embodiment accompanying drawing.
Accompanying drawing is the circuit diagram of the embodiment of the invention, among the figure: the 1st, the PC bus; The 2nd, the multi-display card controller; The 3rd, the decoding pin is deposited driver; The 4th, transformed display card (an external display CRT); The 5th, the IOR on the display card, IOW, MEMR, MEMW signal driver; The 6th, other circuit of display card.
Corresponding two addresses of each output terminal Pi of 3 among the figure, one of them makes Pi is low level, another makes Pi is high level, having only PO when start is low level, make and have only the reading writing signal driver of O display card to open, so card can with the PC bus exchanging data.And P1～Pn is a high level, so other display card all can not with PC bus switch information, show off closed condition, when needs display card and PC bus exchanging data, only need visit PO high level corresponding address earlier, PO becomes high level and by pinning, make the reading writing signal driver of O display card be off-state, promptly closed card O number, after this again the Pj of the J display card correspondence of appointment is become low level by visiting its low level corresponding address, so the J display card of appointment can be with PC bus switch information, the action of other display card by that analogy.
The transformation of used display card here is very simple, and the reading writing signal driver of general display card is made of 74LS244, and its control end G is originally ground connection, and is existing as long as G end and ground disconnected and receive 3 output terminal Pi and go up.
Advantages such as if above multi-display system is used for automatical measure and control system, it is fast to make them have frame updating speed, and the software compatibility is good, and the system development time is short.Comparing price with other same device can hang down about 1/3rd.
Claims (2)
1, a kind of multi-display card that is used for computing machine switches method, it is characterized in that on computing machine (PC) bus and be connected to plural display card, utilize between a controller control computer bus and the display card read-write line to be the state that opens or closes, finish multi-display card and switch.
2, switch method according to the said multi-display card of claim 1, it is characterized in that said controller is to deposit the software control switch that driver constitutes by the decoding pin, the input end of this software control switch links to each other with computer bus, its a plurality of output terminals are received the IOR of each display card, IOW, MEMR is on the control end G of the three-state driver of four signals of MEMW.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91106429 CN1026827C (en) | 1991-05-29 | 1991-05-29 | Method for switchover of multi-display card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91106429 CN1026827C (en) | 1991-05-29 | 1991-05-29 | Method for switchover of multi-display card |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1067320A true CN1067320A (en) | 1992-12-23 |
| CN1026827C CN1026827C (en) | 1994-11-30 |
Family
ID=4907847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91106429 Expired - Fee Related CN1026827C (en) | 1991-05-29 | 1991-05-29 | Method for switchover of multi-display card |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1026827C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100359460C (en) * | 2006-06-09 | 2008-01-02 | 宋丽娟 | Planning scheme of electronic device with multiple display screen parallel |
| CN101965608A (en) * | 2008-01-07 | 2011-02-02 | 智能技术Ulc公司 | Method of managing applications in a multi-monitor computer system and multi-monitor computer system employing the method |
| CN101470510B (en) * | 2007-12-26 | 2013-03-06 | 微星科技股份有限公司 | Main unit apparatus capable of saving energy consumption of drawing card, and computer system |
| CN109933434A (en) * | 2018-04-12 | 2019-06-25 | 威盛电子股份有限公司 | Electronic device and the method for extending peripheral equipment |
-
1991
- 1991-05-29 CN CN 91106429 patent/CN1026827C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100359460C (en) * | 2006-06-09 | 2008-01-02 | 宋丽娟 | Planning scheme of electronic device with multiple display screen parallel |
| CN101470510B (en) * | 2007-12-26 | 2013-03-06 | 微星科技股份有限公司 | Main unit apparatus capable of saving energy consumption of drawing card, and computer system |
| CN101965608A (en) * | 2008-01-07 | 2011-02-02 | 智能技术Ulc公司 | Method of managing applications in a multi-monitor computer system and multi-monitor computer system employing the method |
| CN109933434A (en) * | 2018-04-12 | 2019-06-25 | 威盛电子股份有限公司 | Electronic device and the method for extending peripheral equipment |
| CN109933434B (en) * | 2018-04-12 | 2021-06-18 | 威盛电子股份有限公司 | Electronic device and method for expanding peripheral equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1026827C (en) | 1994-11-30 |
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