Cao Changjiu never understood why the microcomputer they wanted to make was called 0521. Later, Zhang Chi explained to him that according to the national plan, 2XX is a series of high-performance computers, such as 220, and 1XX is a series of small computers, mainly imitating the American DEC and NOVA series, such as DJS130 and DJS150.

These small general-purpose machines can be completed independently by research institutes and colleges, and although they are the task of the state, they are numbered only according to the sequence.

And those earth-shattering large-scale, giant machine plans, ordinary units simply can not be completed independently, so the state has to organize manpower to set up special project appropriations, and the general code is the date of the project, such as the 748 project and the 757 project.

As for the microcomputer, it is a new business, according to the number that goes down step by step, it can only be numbered in the 05 series, and the microprocessor designed for a long time and made by Lishan is codenamed 021, so the code name of this domestic microcomputer is naturally 0521.

Zhang Chi was a little excited when he said this, and looked at Chang Chang with envy: "This is a great honor, you don't know how many people want this number, you are the first!"

"Let's pull it down, it's better to have something practical, whether it's money or an official, I want it, what's the matter with a non-salty number, do you want a child?"

Zhang Chi listened to the words for a long time, as if he had seen an alien, and looked at Chang Chang with surprised eyes.

I read the meaning of Zhang Chi's eyes very clearly for a long time, and it was almost the same as the landlord Mars.

Zhang Chi said slowly: "You are still a child, I don't know how much it means." The whole country does not know how many units are developing microcomputers, and who does not want to get this honor, let alone enter Zhongnanhai to become a standard computer recognized by the state. As far as I know, there are several microcomputer research and development groups in the six institutes of the Ministry of Electronics, and they have all achieved results, whether they are copiing the Soviet Union or the United States, they have been successful, but none of them have been promoted. ”

Long asked rhetorically: "Since it has been successful, why not promote it, a major event that benefits the country and the people!"

"It's that simple, let's not talk about the Soviet Union, their microcomputer technology is not as advanced as ours. The US imperialists are the founders of Batumi, and they do not give us a chance at all, only they can make microprocessor chips, and Batumi clearly stipulates that China is restricted from importing advanced microelectronic products. In recent years, the honeymoon between China and the United States has led to a little loosening in Batumi, otherwise where do you think the chips of the microcomputer come from?"

"That's just as well. After thinking for a long time, "In other words, it is only because the microprocessor I designed is made in China that I see hope in the organization!

Zhang Chi nodded: "It can be said that the organization knows that it can't rely on the technology of the Americans and has to rely on their products, and it is having a headache with this problem." Your 021 processor is tantamount to sending charcoal in the snow, who can you use without your own things? ”

"I know, I'm not helping you!"

"I'm not afraid of leaking secrets, I also tell you that the above is very confident in your things, and it is interesting to take this opportunity to revitalize Huaxia's computer technology and strive to rush to the international advanced level. ”

Chang Chang shook his head: "This is difficult, my personal confidence is very group, but this is not a goal that can be achieved in the short term." ”

Zhang Chi smiled mysteriously: "As long as there is national support, what are you afraid of, you will be able to do it one day." It seems that there is no problem with the plan to enter the sea now, and the key is the next step. ”

"What's next?" asked Chang Chang curiously.

"You don't know yet, now the microcomputer is finalized in 0521, there is no big problem, only those guys from the Sixth Institute of the Ministry of Electronics developed a microcomputer based on Motorola 68000 can compete. The next step for the country is to take advantage of the opportunity of the third census to develop medium-sized computers, do you think this is an opportunity? You have also participated in the 757 Project. ”

Chang Yi waved his hand and said, "757 I have withdrawn, and to be honest, I am not optimistic about it. ”

"Hmm, why?" Zhang Chi asked.

"The 757 is a newly designed vector machine, which is very advanced from a technical point of view. However, the performance of the prototype is the level of foreign medium-sized machines. This time, I went back to take a look, and their progress was very bad, and it seems that since Wang left, the 757 group has not solved any technical problems at all, and is still standing still. When it comes to the king's house, I can't help but be gloomy for a long time.

Zhang Chi also felt the same way: "Yes, the three armies must be without a handsome." ”

"It's better to do your job well first, one person can't change the whole country. ”

——————

It has been a month since the long return, and the research and development team has overcome the biggest difficulty - the Chinese character system. In the past, computers were based on the Latin alphabet, and how to make the computer display Chinese characters was a roadblock, which made Chinese technicians quite nerve-wracking, so that it was very popular for a while that the theory of the uselessness of Chinese characters almost disappeared from the Chinese characters that had been passed down for thousands of years.

As early as 74 years, the state carried out research on the Chinese character system, known as the 748 Project, which laid a solid foundation for the successful development of the later Chinese character microcomputer.

The Chinese character information system includes the research of Chinese character input technology, Chinese character output technology, Chinese character font technology and Chinese-English compatibility technology. Among them, the most difficult to solve is the Chinese-English compatible technology.

In order to solve the problem of Chinese-English compatible technology, Huaxia's technicians have made great efforts, but still have little success.

That's why Professor Yang is full of praise for the long-term operating system and videoform software, because the long-term program is naturally Chinese-English compatible and has a native double-byte design.

The 0521 microcomputer BIOS designed by the microcomputer research and development team expands many functions, stipulating that English characters are represented by a single byte, and Chinese characters are represented by double bytes, so that the BIOS can not only accept English encoding, but also accept and process Chinese character encoding and Chinese-English mixed coding.

With the long-term operating system, 0521 finally achieved native Chinese-English compatibility, and on this basis, the high-level language and database that could only handle single-byte Western strings can also be easily expanded to accept and process Chinese characters.

Such a big obstacle can be crossed so easily, how not to make Professor Yang FQ happy, she was originally going to spend a year dedicated to developing the Chinese character system, but now it seems that there is no need.

As for the input and output technology of Chinese characters, there are a lot of research results in China, and Peking University has related research, but few of them can be used in the long run.

Because the Chinese character keyboard technology and the coding program of the pen code are relatively backward. As the name suggests, the large keyboard is a very large keyboard, about the size of four tables, containing nearly 6,000 commonly used Chinese characters.

And the pen code has long thought that everything except five strokes can be given up, but this is his extreme weakness, and he doesn't know the principle of five strokes at all.

At this time, Wang Yongmin didn't know where to nest, it was really a trick in the world.

I couldn't do it for a long time.,I had to make up a pinyin input method.,Fortunately, he doesn't need to work hard personally.,Just need him to put forward a framework to point out a direction.,There are a group of people who charge into battle and stay up all night.。

In this way, with the automatic generation program of Chinese character coding dictionary developed by Peking University, the problem of Chinese character input has also been solved.

The output problem is also easy to solve, and the Chinese character graphic display controller developed by the Anhui Institute of Control effectively solves this problem. I have been very emotional for a long time, it turns out that it is so easy to develop a system in this era, and the concerted efforts of the planned economy are really powerful, and when you want to put it in your dreams, you have to do everything yourself without money. How can patents win people's hearts!

The font of the 16×16 dot matrix is Peking University's own, and Professor Wang Xuan has made great efforts.

The long-term price is to provide computer technology to support Professor Wang's laser phototypesetting system, but to be able to leave a name in this groundbreaking career, why not want to be long-term?

Speaking of Professor Wang Xuan and Changjiu, there is still a story, let me talk about it later, and I will not press the table for the time being.

The only fly in the ointment is memory,021 congenital insufficiency,8-bit microprocessors are all this problem-the limitation of the address bus has led to addressing64k memory,This can be a big shortcoming,English is also improvised,The amount of information in Chinese characters is too large,Memory space is really stretched。

This can make them struggle for a long time, it is impossible to add it, it is impossible to change the processor, and they can only find a way to do it on the circuit board.

This is also the most reluctant to see for a long time, his idea is to streamline, the simpler the better, and the complex way of addressing is the disadvantage he hates the most, because it will cause a bunch of procedural troubles.

The R&D team discussed for a long time, and there was no common opinion, but in the end, Zhang Chili overrode the public opinion and directly adopted the usual practice - adding a special external address translation mechanism, making 0521 break through the limit of the 8-bit machine64kThe memory reached 512k.

Here we will introduce the problem of memory addressing, where the 8-microprocessor transmits data against the bus, like an 8-bit lane. Leaning on this lane, the processor can read or store 2 memory addresses to the 8th power, which is 64k.

Similarly, the 16-bit processor lane is wider, and more address units can be processed.

The more memory that can be addressed, the larger programs can be processed, which is why the number of bits on the address bus is expanded.

He didn't object for a long time, because he also knew that there was no better way to avoid this problem, and the 8-bit machine had to cross this hurdle in order to realize the processing of Chinese characters, which was actually sacrificing performance in exchange for space.

——————

Break through your own limits and temporarily transform into a 3K party.

Shameless today, the number of words has also reached 16w, I implore you to comment after reading it, thank you for your support, mouth and mouth!