The scientific name of the hub is HUB, a simple hardware structure, and its ports map all the ports in the network domain, that is, a computer in the LAN sends out a packet, and all computers receive it, so it is easy to produce broadcast storms and block the network. Networks connected to hubs share bandwidth, and the more users there are, the slower the speed.

A switch is different, also known as a switched hub, which follows a fixed network protocol and enables point-to-point connections, so each computer has exclusive bandwidth.

Because of this advantage, the switch completely replaced the HUB as soon as it appeared, and became a tool for networking.

The old director's idea is extremely ingenious and has greatly inspired the long-term inspiration.

The long-term idea is limited to how to create a professional exchange system, and the old director focuses on how to use computers to realize the exchange function.

Even so, Changchang and the old director also got together to draft the overall plan, and then divided their labors and began to write software protocols and design hardware structures respectively.

There are a lot of things involved, such as the identification of each machine, how to represent the transfer packet, and how to avoid conflicts.

Cao Changjiu doesn't know much about these, but agreements are his forte. The old director took a few people and began to design a special interface card, integrating several ports for line connection, and all protocols were solidified in EPROM.

It's just that as soon as this project is completed, everything is delayed, and for a long time, he only manages the software architecture, writes the exchange protocol, and as for other practical problems, he is led by the old director to solve them, and after he completes his task, he devotes himself to the development of multiprocessor computers.

Lao Sun had come back with all the components he had been asking for for a long time, and he was very surprised to see that the institute was actually doing LAN experiments.

"When did this happen?" Lao Sun came up and prepared to move the machine a few times.

"Don't mess around, it's been running for a few days, and if you mess up the data, you'll have to start all over again. "I have been busy with the things at hand for a long time, and I don't forget to remind him.

"I'll just see, don't do it. Lao Sun really looked at the data flashing on the screen with his hands behind his back, "It's really a bit of a look, it's similar to what I've seen before." ”

"Oh. "Where have you seen this?"

"Last year, I met when I went to Europe with a study delegation. That's what they did in college, but it doesn't seem to be the same. Lao Sun took a closer look and shook his head, "Why did you just do it so quickly, it's only been a few days." ”

"Of course it's different, it's our own design, we don't have to think about compatibility with foreigners or anything, we can design how we want, and the agreement is written by ourselves, of course it's fast. "I couldn't help but think about myself for a long time, and most of the work was done by the old director.

"Oh, by the way, everything has arrived, what now?" asked Lao Sun.

"Take it all, the circuit board is ready these days, let's just assemble it. ”

Lao Sun is not generally cautious, all the accessories he bought back are double, his explanation for this is that everything has to be put in a margin, so that Chang Chang felt a sigh in his heart, these guys are really generous.

However, it is better to waste a little than to tie your hands and feet, anyway, there are many things, and the design will be released for a long time. What the old director means is that it can catch up with the performance of domestic small machines such as DJS130.

Of course, I have long understood the difference, as long as the 0521 microcomputer is equipped with enough peripherals, it has surpassed the DJS1X0 series microcomputer, as for the volume, power consumption, and stability, it is incomparable.

Therefore, the long-term goal is to have tens of millions of mainframe computers, at least not less than 10 million times, otherwise many things cannot be realized.

Moreover, the cost should be controlled, the manufacturing should be simple, and the parts are all universal and can be bought in the market.

In order to implement this goal, the program has been specially modified for a long time, the original plan is to integrate 2~4 Motorola 68000, and now in order to achieve the goal, at least 8~16 will be integrated.

Cao Changjiu also borrowed from the technology developed by the Institute of Computing 757, using shared memory design, this technology was also proposed for a long time, and it took a lot of effort to succeed, and there is no such statement abroad (historical facts, when this technology was leading in China, but it was not known to outsiders, and it was not until later that foreigners proposed it, and we did not know that our own people were actually advanced).

The overall design is not a problem, the key is to make a prototype for debugging, so that problems can be found in actual work.

For a long time, they worked overtime day and night, fought for most of the month, and finally came up with a prototype.

Limited to the problem of integration, the long-term design of this super workstation is not small, equivalent to a refrigerator, equipped with a TV as a monitor, 16 trillion memory, 20 trillion hard disk, external tape drive, printer, except for the central processing unit is Motorola 68000, the others are almost a copy of the mainframe.

This is also a long-term adjustment to save time, if too many changes are made, the software part has to spend a lot of effort to rewrite, which is a detailed work, and it may not be possible.

Coincidentally, the old director of their switch project has also made progress, they have always been imitation, thorough, improvement, this time the first time to design their own manufacturing does not need to be compatible with no samples, the pressure is also very high, but there is plenty of space to move freely.

Many people who participated in the development were a little worried, for fear that something would not meet the norms, did not keep up with the international trend, and did not dare to take a step beyond Lei Chi.

On the contrary, the old director is imaginative, and he doesn't take his own creation seriously at all, but is very keen on this work and does it happily.

Whenever someone asked him if he was looking for an opportunity to invite a foreign expert to give a comment, the old director glared at him and reprimanded: "Commenting on Mao, what's wrong with me, is it the right way to do what they want?

For a long time, I have seen the old director go crazy once, and I think that the technical standards are closed, and even if it is opened, it is not good, mainly depending on whether there is room in the domestic market.

For example, in Japan, the Japanese say that it is a democratic country, but in fact, it is okay to be closed, and I don't know about the rest.

It's not a domestic product of the current Lenovo model, it's an assembly factory, just take a screwdriver and hire two migrant workers (exaggerated). The Japanese have been completely domestic from the beginning, and before the advent of PCs, several manufacturers carved up the market, and the chips were completely domestic.

After the advent of PCs, the Japanese imitated the 8086 microprocessor, and NEC launched the PC-98 series of microcomputers, dominating the market. The instruction set was also modified so that their machines were PC-compatible, whereas IBM-PCs could not run their software.

With the support of the government, NEC monopolized the entire Japanese market and once became the world's largest semiconductor manufacturer.

Although the Japanese finally opened up the market under pressure from the Americans, and the PC-98 series disappeared completely, the impact was great, the promotion of the domestic industry, and the development of science and technology.

All this is because Japan is a defeated country without sovereignty, so that people often say that the PC-98 series is a failed winner.

For a long time, I hate those guys who are shouting about exchanging the market for technology, and exchanging the market for technology is equivalent to the Song people losing the twelve states of Youyun, and the commanding heights are occupied, you have to follow him.

It's a pity that in the 80s, such things emerged one after another, and the Chinese people who had just seen the world thought that foreigners were saviors and came to help the development of China, so they were defenseless, even if there were far-sighted people who saw the crisis, they were selectively ignored by the Chinese people.

At that time, the domestic academic environment was very free, and the technology was almost all open, as long as there was a letter of introduction, the technology manufacturers knew almost everything, which was an important reason why New China had repeatedly produced results in scientific and technological research.

In the early days of reform and opening up, everyone still thought that foreigners did the same, and they also pursued such a policy by foreigners, and the losses caused were immeasurable. What is more, because of the extreme national inferiority complex, they have specially invited "foreign experts" to examine their own scientific and technological achievements, and how the "experts" have not been ecstatic, not only have they acquired technology free of charge, but have also taken a high degree of scrutiny of some key technologies, and have devalued what we ourselves considered very advanced to be worthless.

In 1985, under the guidance of the banner of "good-neighborliness, friendship and cooperation", Japan visited an industrial automation research institute in Shenyang. Chinese scientists showed their outstanding "inferiority" in front of their "imported" counterparts in Japan, and took out almost the entire automation project and asked the Japanese to carry out the so-called "approval", but even as Japan's complete industrial automation at this time is only a "prototype", and China is a formed scientific and technological project, but it has not yet been popularized on a large scale. 1986 year. Japan announced the first successful manufacturing and R&D, integrated industrial automation project. It is only then that China realizes its ignorance.

The year 1988 was just the end of the U.S. Peace Model Project, and the so-called "American democracy, Westernization of China" ideology in China continued to rise. At that time, the theory that all domestic science and technology was garbage was everywhere. Shanghai X Shipbuilding carried out "good-neighborliness and friendship" with Japan, and sold the "XXX type intensive digital welding system" developed by itself after years of painstaking efforts to Japan again free of charge. This system was designed by Chinese scientists in the early 60s using early Russian electronic machine tools under secret conditions. It can be said that in the 80s in Asia, that was the most advanced equipment.

However, he was ordered to dismount under the "high scrutiny" of Japanese experts. In 1989, China and Japan signed a contract to import large-scale welding systems from Japan, which was about 300 million US dollars, but it was stopped due to the 89 incident. In 1992, through exchanges and cooperation with the French XX company, the Chinese woke up to a dream - 80% of the $1.2 billion electronic numerical control equipment imported from France was "examined by friendly experts" by Japan in the mid-80s. These are high-tech. As for stupid so-called collaborations such as trading Yamaha motorcycle technology for China's aerospace precision navigation technology, the Chinese did not stop there.

So it's very unfair to be able to do it yourself for a long time, and it's almost pathological, a common problem of angry youth, but since the road ahead has been different, what's the harm in trying this one.

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About drinking: if I had a good father, if I was rich, if I were a public servant...... Then what else do I look at other people's faces, holding on to socializing?

About writing about drinking: everyone is uncomfortable reading it, so I won't write it, and writing it is an introduction, indicating that you were in an unconscious state when you wrote this chapter.

Concerning...... Think about it and write it again, the book review is being sorted out, and it will be released soon.