CN2148352Y

CN2148352Y - System space character/pattern card with power supply provide for oneself

Info

Publication number: CN2148352Y
Application number: CN 93206466
Authority: CN
Inventors: 侬建新
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-03-10
Filing date: 1993-03-10
Publication date: 1993-12-01
Anticipated expiration: 2003-03-10

Abstract

The utility model relates to a functional expansion card which is matched with a microcomputer. The character and pattern card of the utility model is composed of at least one read only memory chip, a read-write memory chip, a decoder chip and a power supply, wherein, a data line and an address line of the read only memory chip and the read-write memory chip are connected with the data line and the address line of an expansion inserting groove; a decoder is used for ensuring that the memories obtain a correct address range; the power supply is connected with a positive power supply of a read-write memory, and the positive power supplies of the other chips are connected with the power supply of the expansion slot. The pattern card converts a storage space of a logic address only on the original microcomputer into a physical memory space, and still retains messages which are input by a user after the microcomputer is switched off.

Description

System space character/pattern card with power supply provide for oneself

The utility model relates to and the matching used function expansion card of microcomputer.

Microcomputer in the past (hereinafter to be referred as microcomputer) will embed the new quite difficulty of character or figure (case) collection that is of little use, and microcomputer calls conventional characters collection (as Chinese character set), figure (case) collection is many realizes with reading modes soft, the hard disc data, because of being to read data file, speed is relatively slow.Because above limitation, the use of microcomputer still is being restricted aspect the normal words processing.

The purpose of this utility model is will only have the storage space of logical address to be converted into the actual physical storage space on the former microcomputer with ordinary numbers integrated circuit (IC) chip and common power, and still can keep the information of user's input after the microcomputer outage.

Character graphics card described in the utility model is by a slice ROM chip at least, the read-write memory chip, decoder chip and a power supply are formed, the appropriate address line of ROM chip IC1, data line card last and the address wire of expansion slot and the relevant position of data line of being placed in parallel respectively, be connected to the output pin of decoder chip IC4 after exporting permission and chip select line being in parallel, the appropriate address line of read-write memory IC2 chip, data line card last and the address wire of expansion slot and the relevant position of data line of being placed in parallel respectively, after allowing line and chip select line is in parallel, output receives again on the output pin of decoder chip, write and allow line parallel to be placed on the card and the relevant position of expansion slot memory write line, its positive supply is connected with above-mentioned power supply, the input pin of decoder chip IC4 places on the card and the address wire relevant position of expansion slot, the anti-phase back of negative logic control line one ground connection, its two appropriate address line position that is connected to expansion slot, ROM chip IC1, the positive supply of decoder chip IC4 places card to go up the relevant position that is connected with the expansion slot power supply, the equal ground connection of the negative supply of described chip.

ROM (read-only memory) described in the utility model is PROM, EPROM etc., the interior installing of ROM chip is equipped with driver and character graphics (case) collection supplies system call, read-write memory is SRAM etc., DRAM etc., read-write memory is used for providing the information stores space for the user, it is one normal for read-write memory is obtained, stable working power, between the positive supply of aforementioned power source (this card is self-powered) and read-write memory chip, three terminal regulator IC5 can be set, code translator IC4 is in order to guarantee that described storer obtains the correct address scope, not circuit IC3 also can be set finish above task jointly, the input pin of not circuit chip IC 3 places card to go up and the corresponding position of expansion slot address wire, and output pin connects the anti-phase negative logic control line of decoder chip IC4.Because the influence of factors such as ic core tablet quality, circuit board wiring in the circuit can produce self-sustained oscillation in the circuit sometimes, for anti-generation of planting phenomenon here can be provided with capacitor C 1, C2, C3 in circuit.

The utility model available encoder writes ROM (read-only memory) easily with known character set or figure (case) collection (as interim Chinese character collection, the International Phonetic Symbols character set etc. more that add of need), after this since these character set in fact be present in the system space of microcomputer (just in the past these spaces not ripple be used for depositing character set), so microcomputer is when calling, what read is the data of system space, its reading speed reads outer deposit data faster than microcomputer greatly, thereby has improved the speed of calling character set.To show, when the printed character set reticular density is less demanding, adopt the utility model, microcomputer even can need not quick demonstration, the printing that hard disk also can be realized Chinese character is used as the system cost of normal words processing requirements with microcomputer thereby reduced, and has improved cost performance.

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 realizes a physical circuit figure of the present utility model.

Fig. 2 is the printing specimen page of the International Phonetic Symbols character set of Fig. 1 circuit realization.

Fig. 3 is the printing specimen page of Chinese character collection more that Fig. 1 circuit is realized.

IC1 is a ROM chip as shown in Figure 1, IC2 is the read-write memory chip, IC4 is a code translator, IC1 is used for writing known character set (in the present embodiment, be written into " International Phonetic Symbols character set " and " Chinese character collection more " among the IC1), A0-A15 is the address wire that links with expansion slot, their simultaneously with the respective foot UNICOM of IC1, IC2, connecting mode as shown in the figure, the data line of D0-D7 for linking with expansion slot, the connecting mode of they and IC1, IC2 is as shown in the figure; The input pin A of IC4, B, the address wire A15 of C and expansion slot, A16, A17 links to each other, and by IC1, the chip select line of IC2 allows line (CS and OE) back in parallel respectively to be connected with the output pin (Y0 pin and Y4 pin) of IC4 with output, to limit IC1, the address area fragment position in microsystem space, IC2 place, IC2 writes the memory write line MEMW that allows line WE to connect expansion slot, the input pin A1 of not circuit IC3 links to each other with the address wire A18 of expansion slot, corresponding output pin Y1 is connected with negative logic control line G2b after IC4 is anti-phase, power supply E is connected with the positive supply VDD of IC2, voltage stabilizer IC5 is arranged therebetween, IC1, IC3, the positive supply VDD of IC4 is connected to the power supply+5V of expansion slot, the equal ground connection of all negative supply VSS.Capacitor C 1 one is connected to IC1 ends by the power supply other end ground connection.One of capacitor C 2 is connected to by the IC3 positive supply, other end ground connection, and one of capacitor C 3 terminates to by the IC4 positive supply, other end ground connection.

Claims

1, a kind of self-powered system space characters/graphics card, it is characterized in that by a slice ROM chip at least, the read-write memory chip, decoder chip and a power supply are formed, the appropriate address line of ROM chip IC1, data line card last and the address wire of expansion slot and the relevant position of data line of being placed in parallel respectively, be connected to the output pin of decoder chip IC4 after exporting permission and chip select line being in parallel, the appropriate address line of read-write memory IC2 chip, data line card last and the address wire of expansion slot and the relevant position of data line of being placed in parallel respectively, after allowing line and chip select line is in parallel, output receives again on the output pin of decoder chip, write and allow line parallel to be placed on the card and the relevant position of expansion slot memory write line, its positive supply is connected with above-mentioned power supply E, the input pin of decoder chip IC4 places on the card and the address wire relevant position of expansion slot, the anti-phase back of negative logic control line one ground connection, its two appropriate address line position that is connected to expansion slot, ROM chip IC1, the positive supply of decoder chip IC4 places card to go up the relevant position that is connected with the expansion slot power supply, the equal ground connection of the negative supply of described chip.

2, according to the described character graphics card of claim 1, it is characterized in that not circuit chip IC 3 is arranged in foregoing circuit, its input pin places card to go up and the corresponding position of expansion slot address wire, and output pin connects the anti-phase negative logic control line of decoder chip IC4.

3,, it is characterized in that between power supply E and read-write memory chip IC 2, three terminal regulator IC5 being arranged according to the described character graphics card of claim 1.

4,, it is characterized in that capacitor C 1 one is connected to by the IC1 positive supply other end ground connection according to the described character graphics card of claim 1-3.

5,, it is characterized in that capacitor C 2 one is connected to by the IC3 positive supply other end ground connection according to the described character graphics card of claim 1-3.

6,, it is characterized in that capacitor C 3 one is connected to by the IC4 positive supply other end ground connection according to the described character graphics card of claim 1-3.

7, according to the described character graphics card of claim 1, it is characterized in that described ROM (read-only memory) is PROM(or EPROM).

8, according to the described character graphics card of claim 1, it is characterized in that described read-write memory is SRAM(or DRAM).