CN2146738Y - Buffer shared device of printer - Google Patents
Buffer shared device of printer Download PDFInfo
- Publication number
- CN2146738Y CN2146738Y CN 92233945 CN92233945U CN2146738Y CN 2146738 Y CN2146738 Y CN 2146738Y CN 92233945 CN92233945 CN 92233945 CN 92233945 U CN92233945 U CN 92233945U CN 2146738 Y CN2146738 Y CN 2146738Y
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- China
- Prior art keywords
- interface circuit
- host interface
- buffer zone
- buffer
- data
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Abstract
The utility model relates to a buffer shared device of a printer, which belongs to an external device of a computer. The utility model comprises a microprocessor (CPU) 1, a read only memory 2, an RAM 3, an interface circuit 4 for the output of a printer, and 5 host interface circuits. The utility model can reliably realize that a plurality of microcomputers with different types jointly use one printer. The buffer shared device of a printer enhances the use rate of a computer, and saves a large quantity of equipment cost simultaneously.
Description
The utility model relates to the printer shared device of a kind of computer peripheral, particularly microcomputer.
Original microcomputer all is that every main frame is joined a printer, and in applications such as teaching, scientific research, printer is not oepration at full load, and general utilization has only 10%, even effective storage life is shorter, has wasted printer resource.For addressing this problem, the someone has developed a kind of printer shared device, and the substitute mode of this shared device adopts manually, can't realize automatic switching.
The purpose of this utility model provide a kind of by computer control, have data input buffer, a kind of intelligence printer buffering shared device that can transfer automatically.
The utility model is to realize like this, as shown in Figure 1, by microprocessor (CPU) 1, ROM (read-only memory) 2, random access memory device 3, printer output interface circuit 4, host interface circuit 5, host interface circuit 6, host interface circuit 7, host interface circuit 8, host interface circuit 9 is coupled to each other formation, microprocessor (CPU) 1 is input to host interface circuit 5 respectively with data, host interface circuit 6, host interface circuit 7, host interface circuit 8 and host interface circuit 9, the program of depositing that microprocessor 1 is carried out in the ROM (read-only memory) 2 is read in each host interface circuit data respectively in good time, and deposit the data input buffer that constitutes by random memory 3 in, several parts that are divided into respective numbers according to the quantity of host interface circuit, each partial data input block is designed to circle queue, it is ring-like FIFO buffer, each buffer zone is provided with two pointers, owner pointer and tail pointer, buffer zone has following 4 states during program work:
A, data deposit in: data of the every reception of buffer zone, and owner pointer adds 1;
B, data are read: read data from buffer zone, tail pointer adds 1 at every turn;
C, buffer empty: during read data,, show that buffer zone is empty when the buffer zone tail pointer increases to when equating with owner pointer;
D, buffer zone are full: when depositing data in,, show that buffer zone is full when the buffer zone owner pointer increases to when equating with tail pointer,
Annulus is a with neither head nor tail buffer zone, when program is operated buffer zone, when if the initial and end pointer of buffer zone has reached between buffer empty superlatively the location, make and be modified as the buffer zone lowest address automatically, form ring-like, from random access memory 3, take out data by microprocessor 1 then, deliver to printer prints by printer output interface circuit 4.
The utility model has the advantages that significantly:
1, because the utility model is provided with data input buffer, the data of main frame output can at first deposit data input buffer in, and this shared device is sent the data that receive into printer prints.Thereby, solved the inquiry wait problem that quick main frame exists when the printer output data, realized true off-line printing, so increased substantially the speed when main frame is carried out print out task.
2, because the utility model has been realized many shared printers of microcomputer, in the utilization factor that improves printer, saved plurality of printers.Present every the about 4000-8000 of printer price unit, thereby saved the large number quipments expense.
Fig. 1 is a block scheme of the present utility model.
A kind of embodiment of the present utility model as shown in Figure 1, microprocessor (CPU) 1 is made of 280ACPU, ROM (read-only memory) 2 is made of 2716 integrated circuit, random access memory 3 is made of 4164 integrated circuit, printer output interface circuit 4 is made of 74LS374 and 74LS244 integrated circuit, and host interface circuit 5, host interface circuit 6, host interface circuit 7, host interface circuit 8 and host interface circuit 9 constitute by the PIO integrated circuit.This printer buffer shared device on probation through 1 year, the conversion printing function is reliable, safe, easy to use.
Claims (1)
1, a kind of printer buffer shared device, it is characterized in that by microprocessor (CPU) 1, ROM (read-only memory) 2, random access memory device 3, printer output interface circuit 4, host interface circuit 5, host interface circuit 6, host interface circuit 7, host interface circuit 8, host interface circuit 9 constitutes, microprocessor (CPU) 1 is input to host interface circuit 5 respectively with data, host interface circuit 6, host interface circuit 7, host interface circuit 8 and host interface circuit 9, microprocessor 1 is carried out the program of depositing in the ROM (read-only memory) 2 and each host interface circuit data is read in respectively in good time, and deposit the data input buffer that constitutes by random memory 3 in, several parts that are divided into respective numbers according to the quantity of host interface circuit, each partial data input block is designed to circle queue, it is ring-like FIFO buffer, each buffer zone is provided with two pointers, owner pointer and tail pointer, buffer zone has following 4 states during program work:
A, data deposit in: data of the every reception of buffer zone, and owner pointer adds 1;
B, data are read: read data from buffer zone, tail pointer adds 1 at every turn;
C, buffer empty: during read data,, show that buffer zone is empty when the buffer zone tail pointer increases to when equating with owner pointer;
D, buffer zone are full: when depositing data in,, show that buffer zone is full when the buffer zone owner pointer increases to when equating with tail pointer,
Buffer circle is a with neither head nor tail buffer zone, when program is operated buffer zone, when if the initial and end pointer of buffer zone has reached between buffer empty superlatively the location, make and be modified as the buffer zone lowest address automatically, form ring-like, from random access memory 3, take out data by microprocessor 1 then, deliver to printer prints by printer output interface circuit 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92233945 CN2146738Y (en) | 1992-09-28 | 1992-09-28 | Buffer shared device of printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92233945 CN2146738Y (en) | 1992-09-28 | 1992-09-28 | Buffer shared device of printer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2146738Y true CN2146738Y (en) | 1993-11-17 |
Family
ID=33776144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92233945 Expired - Fee Related CN2146738Y (en) | 1992-09-28 | 1992-09-28 | Buffer shared device of printer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2146738Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101052942B (en) * | 2004-10-15 | 2010-05-12 | 富士胶卷迪马蒂克斯股份有限公司 | Printing system software architecture |
| US7821548B2 (en) | 2005-06-03 | 2010-10-26 | Nokia Corporation | Temporal image buffer for image processor using compressed raw image |
| CN101968903A (en) * | 2010-09-21 | 2011-02-09 | 广州广电运通金融电子股份有限公司 | Valuable file identification method and system |
-
1992
- 1992-09-28 CN CN 92233945 patent/CN2146738Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101052942B (en) * | 2004-10-15 | 2010-05-12 | 富士胶卷迪马蒂克斯股份有限公司 | Printing system software architecture |
| US7821548B2 (en) | 2005-06-03 | 2010-10-26 | Nokia Corporation | Temporal image buffer for image processor using compressed raw image |
| CN101968903A (en) * | 2010-09-21 | 2011-02-09 | 广州广电运通金融电子股份有限公司 | Valuable file identification method and system |
| CN101968903B (en) * | 2010-09-21 | 2012-08-29 | 广州广电运通金融电子股份有限公司 | Valuable file identification method and system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |