Chapter 193 Not Big’s First Cry (3k)
A twisted pair was connected between the two circuit boards in front of Gao Zhendong.
These two circuit boards were prepared by the computing center and welded by Gao Zhendong himself.
The components of the pair of Modems extracted from the system are pretty good, but the details of the circuit boards and the calculations provided by the batch are definitely different, so they are not suitable for public testing.
There is a simple speaker on each circuit board, which is making a "sizzling" sound. This sound sounds a bit novel to Gao Zhendong, but if someone often uses computers around the first five years of the 21st century, Man, this sound is very familiar.
This is the handshake sound of Modem dial-up.
What is different from the future usage method is that in the future, you will usually dial up to an ISP (Internet Service Provider) and access the Internet through the ISP. However, here in Gao Zhendong, there is no ISP, but two Modems are directly connected. .
At the same time, there is no concept of the Internet. At this time, even TCP/IP is still sleeping in Gao Zhendong's repository.
It is through Modem that the two computers are directly connected from the physical and transmission levels, and they can send data to each other.
And Gao Zhendong’s place is actually just one computer. He connected the two Modems through two different serial data interfaces, and then operated the two different serial ports respectively to check the sending and receiving. situation.
As for how to shake hands, how to send, how to confirm, how to verify this complete series of data, we have to wait for Gao Zhendong's tailored version of telnet and ftp to be completed before it can really work.
But these are all things for later. On the current monitor, two lines of prompt information mixed with Chinese and English are flashing.
“CK1: Handshake with TZJTQ2 successfully”
“CK2: Handshake with TZJTQ1 successfully”
CK, meaning serial port, TZJTQ, is the modem, due to the occupied storage space For this reason, we still tend to use pinyin letters for naming devices in computers.
This is different from prompt information. Prompt information needs to be understandable by ordinary people who use computers. Things like device names only need to be understood by people close to the bottom of the computer.
This is a very simple command line daemon, which omits a lot of network levels, details and steps. Its user interface does not consider ease of use, ergonomics and all other things. Its existence, The only purpose is to let Gao Zhendong master the information he wants to master and issue the instructions he wants to send.
Gao Zhendong has not bothered to write a graphical interface for the time being, although he already has a C language function library.
He entered a line of instructions on the command line.
FSCK1 "aaaa"
This line of command is extremely simple. To send, use port serial port 1. The content sent is the string of characters aaaa.
The information on the upper half of the screen began to refresh, and two lines of new information were refreshed below the original information.
“CK1 sent successfully, sending length=4Byte”
“CK2 received data, data length=4Byte”
After it got through, Gao Zhendong almost cheered, However, it is still one step away from complete success.
Gao Zhendong entered the second line of instructions on the command line.
DQCK2CD=4
The meaning of this line of instruction is also very simple. Read serial port 2 and read the length of 4 bytes.
Gao Zhendong unknowingly held his breath and looked at the monitor.
aaaa
There are no modifications, just these four simple letters.
Looking at these four letters, Gao Zhendong jumped up from his chair like a child: "Haha, it works! It works!"
Others may not know, But Gao Zhendong knew in his heart that this represented the first step for the domestic computer network. Although this step was still small, it meant that a huge and magnificent world had opened its door to us decades in advance.
Thinking of this, Gao Zhendong felt a little regretful. As the first cry of domestic network technology, is "aaaa" too low-level?
As for randomly typing a few characters as test data, as long as programmers have done similar work, it is estimated that 99.9% have done it. Some have several "a"s, some have several "1"s or "1234" " and so on, some even directly roll the keyboard with their faces, Gao Zhendong is also not exempt from this custom.
Then I thought about it, it's okay. This is for my own debugging. It doesn't count. I will wait until all the drivers and protocols are written and the formal communication test with the computing center is carried out.
That’s okay, Gao Zhendong is in a better mood.
Next, he needs to do two things.
The first one is to tailor and perfect telnet and ftp and integrate them into one application. In the days before the operating system was officially launched, this application was a standard domestic computer networking program.
The second one is to add the Modem driver to the operating system being compiled. As for other things, the current hardware environment is not able to support it further.
Talking about technology without context would be a bit empty talk. It’s as if Gao Zhendong knows countless good things and knows many technical evaluations and choices that will be different from the current ones decades later, but in the current situation , maybe they are completely different things.
Is AI good? good!
Will AI be implemented? What the hell!
Gao Zhendong went to the computing office in a happy mood.
I'm not talking about the modem, that's not even interesting.
He was there to deliver C language textbooks and C language exercise books. Gao Zhendong really couldn't bear the slow progress of these things, so he simply used a recent lottery opportunity to exchange for a printing to handwriting service.
This is different from "Principles of Automatic Control". He needs to learn "Principles of Automatic Control" while writing it, but this C language book is different. He knows everything in it.
After all, although many of the contents of this C language textbook are very biased, it is not very deep. This bias is also one of the reasons why this book has been criticized, but it does not affect the large number of C language textbooks at that time. Users all started with it.
In fact, with the formation of tape storage and Chinese editing environments, it is also possible to convert printing to tape files. However, the Chinese environment came out a bit late, and converting to tape files is a bit unjustifiable.
This paper-to-electronic work has to be done by the comrades in the calculation office.
What Gao Zhendong didn’t know was that the calculations were all about handwriting.
He rushed to the computing office on his bicycle and was happy to see him.
Not long after the circuit board was delivered, is there another good product coming out?
He greeted Gao Zhendong cheerfully: "Director Gao, why are you so anxious? I just sent you the circuit board, and you have worked so hard to make a new product?"
As for the new product, he didn't know.
Gao Zhendong is confused, what new product is there?
He took out the manuscript of the C language tutorial and the C language exercise collection from his bag: "Haha, Mr. Chi, there are no new products, but there are two new books. Do you want them?"
Chi When the chief engineer saw the words "C Language" on the cover, he was overjoyed. It must be a C language tutorial.
He grabbed it and said, “I want it, I’ve been looking forward to this for a long time!”
Gao Zhendong explained: "Because I wrote part of it to create a good Chinese editing environment, this book is still handwritten. If we want to use electronic files, we will have to work hard for our comrades in the institute."
Hearing this, Chief Engineer Chi didn't care. Instead, he was a little happy: "What's the hard work? You who wrote the book didn't say it was hard. How hard are we copying the books? Besides, during the input process of converting to electronic files, they can learn. . ”
The reason why Chief Engineer Chi is happy is far more than that. With this manuscript, for the Institute of Information Technology, the collection of the history of information technology development is +1.
Compared with handwritten manuscripts, electronic documents are definitely not that good. A well-known and honest expert on a certain treasure appraisal program often said: "A typical computer worker is not a manual worker. Yes, it’s new.”
If you put a tape there and you see a stack of handwritten manuscripts that have gone through a lot of hard work, the impact and shock will be very different.
After Chief Engineer Chi finished speaking, he turned around and flipped through the manuscript in his hand, shouting to the office next door: "Old Li, Old Li, come here, come here, Director Gao has something good again."
Hearing Chief Engineer Chi's words, Gao Zhendong felt a little uncomfortable. You just let me earn gold coins, right?
Hearing what Chief Engineer Chi said, Director Li hurried over in a few steps. The two of them had a copy of the textbooks and exercises, and they admired them while reading them.
“It’s clear this time that the standard is too abstract.”
“Well, it turns out that this is what it is like. It’s too difficult to understand just by looking at the standard. ”
"It turns out that this data structure is used in this way. The standard says it is clearly explained, but it is difficult to understand."
"These exercises are good and explain in simple terms, allowing people to quickly master the use of commonly used statements."
“Hey, can these operators and statements still be used in this way? Although the statements are very short, it is completely incomprehensible without spending a lot of time.” This is a strange way to read this book. Out of respect, Gao Zhendong also kept these things unchanged and included them in it.
After reading for a long time, he accepted the manuscript with satisfaction. Director Li smiled and said: "Director Gao, we copied this book as quickly as possible and contacted the publishing department at the same time. The course of this book still needs to be Come on, come on, there is no one in China who has a deeper understanding of the C language than you, the creator.”
Gao Zhendong himself doesn’t like using carbon paper because it smells uncomfortable. And I often get blue patches on my hands, so I don’t use them if I can.
However, the system service is very considerate. They bring carbon paper directly, plus the original manuscript, making a total of three copies, so that there is not much delay in the work of several parties. Even the original copy will not be taken out easily, so it needs to be collected.
Gao Zhendong knew about training for sure, and he had to come for the first enlightenment of C language.
He nodded: "No problem. Regarding the scope of training personnel, we can just arrange it. Communicate with me half a month in advance so that I can arrange the time."
Gao Zhendong is preparing As he was leaving, something about the manuscript suddenly reminded him of something. He turned around and asked Chief Engineer Chi: "Director Li, Chief Engineer Chi, are you interested in making something new?"
(This chapter End)