The Science Fiction World of Xueba

Pang Xuelin looked helplessly at the determined girl in front of him, thought for a while, and said, "Qingqing, I'm sorry, but I still can't accept you."

Mu Qingqing smiled and said, "Brother Pang Da, it's okay, I will wait for you slowly."

"That's up to you!"

From Pang Xuelin's point of view, Mu Qingqing will go to Xiangjiang University to study next. As time goes by and the time between the two of them decreases, the other party will naturally forget about him.

But Mu Qingqing has already made up her mind to go to Lanzhou University to study in a few months.

"Brother Pang Da will be very surprised and happy when he sees me. Sincerity is as good as gold and stone, and one day Brother Pang will open his heart to me."

Mu Qingqing secretly cheered herself up.

The two looked at each other and smiled, both thinking that they had achieved their goals.

Next, Pang Xuelin and Mu Qingqing strolled around the Pearl River, and then returned to Fatty Liu's home.

In the evening, Fatty Liu went home and told Pang Xuelin that he had arranged for him to pass the second-line pass.

"Brother Pang, I have entrusted someone to arrange it for you. When the time comes, I will be escorted by someone, and you will enter through the snake head on the side of Shencheng. In addition, I have prepared this for you..."

With that said, Fatty Liu took out two documents and handed them to Pang Xuelin.

"This is?"

Pang Xuelin took it over, and on the cover of one was written "Exclusive Pass to Frontier Defense Restricted Zone" in gold letters, and the other was actually a temporary residence permit for the Shencheng Special Zone.

Fatty Liu grinned and said, "Brother Pang, they are all fake. In case there is a temporary inspection inside, these two fake certificates will be used. The border defense certificate is too difficult to pass through the unit. There are three procedures: political review, inspection by the police station, and certificate application by the Public Security Bureau. If there is no unit, it will be even more difficult, and it needs to be reviewed by the neighborhood committee of the street, and the application procedures are very complicated..."

Pang Xuelin smiled and said, "Old Liu, I will trouble you. By the way, when are we going to Shencheng?"

Fatty Liu said: "Looking at the arrangement over there, it should take another three or four days."

"Three or four days?" Pang Xuelin pondered for a moment and said, "That should be enough."

"What is enough?"

Fatty Liu looked at Pang Xuelin in confusion.

Pang Xuelin smiled and said, "You will understand in two days."

Early the next morning, Pang Xuelin went to Yangcheng Computer City again, and brought back all the packed components in a box.

After the invention of VCD, between 1994 and 1998, there was a peak period of transforming CD into VCD in China.

In those few years, a decoding board was often hundreds or thousands of large. The earliest was a three-wire decoding board. It was required that your CD or CD-ROM drive could find the data in the DSP pin. There are many companies’ DSP chip lists, and the main function pins are listed. Yes, the decoder board only needs to be connected to the three wires of the CD servo board plus the ground wire, and the decoder board can output VCD video. Later, in order to save lazy people, a front card was developed, which inputs RF ( (or called EFM) output is these three signals. After combining the two, it can be adapted to almost any well-known and unknown DSP. As long as this line can find RF, it can be solved.

But now, VCD has not yet been born, and only the C-CUBE company founded by Sun Yansheng, a Chinese-American, has video decoding boards.

Pang Xuelin could only temporarily build it himself.

Therefore, in addition to buying DSP chips, CD-ROMs, dedicated variable voltage power supplies, capacitors, resistors and other components, Pang Xuelin also bought a single-chip microcomputer and an FPGA chip.

In addition, there are multimeter, electric soldering iron, flux, tin wire and other tools.

When Pang Xuelin brought all these things back, Liu Qi and Mu Donglai in the living room became curious.

"Brother Pang, what are you planning to do?"

Pang Xuelin said with a smile: "Make a gadget."

While talking, Pang Xuelin soldered these DSP chips, FPGA chips and other components to the microcontroller one by one with an electric soldering iron.

Afterwards, Pang Xuelin raised his head and said to Liu Qi: "Old Liu, is it convenient for you to unplug your phone and lend it to me?"

"Telephone? What are you doing?"

Liu Qi was puzzled.

Pang Xuelin smiled slightly and said, "Get it here first, and I'll explain it to you after I'm done."

In the real world, there used to be such a joke about top hackers on the Internet.

A long time ago, in the era of WIN98, there was a time when a netizen’s system crashed. That netizen was a computer idiot, and his friend introduced him to a computer expert to help him repair the computer.

Because the other party did not have a WIN98 installation disk, the computer expert asked someone to bring him a landline phone, and he connected the empty end of the phone line to a jack on the computer, entered DOS, and then started talking on the phone. Stop pressing the button.

He pressed the keys very fast, but only pressed the 0 and 1 keys.

That netizen didn't understand the use of this, but he didn't dare to ask. After watching for more than half an hour, the computer expert still kept pressing these two keys.

The netizen gradually became a little sleepy, so he poured Gao Shou a cup of tea for the computer, and went to sleep next door by himself.

When I woke up, more than four hours had passed, the netizen got up and went to the next door, and saw that the computer was being debugged in WIN98.

It wasn't until later that he gradually learned about computers, and finally realized that the master at that time programmed a WIN98 system in machine language.

He later asked his friend about the whereabouts of that master, and his friend said that after going to the United States a few years ago, there was no news.

This joke was widely circulated when the Internet first started to develop rapidly in the early 21st century. Many netizens who were new to computers yearned for master hackers.

It was not until later, with the popularization of the Internet, that everyone gradually realized that it was impossible to write WIN98 in machine language.

But what Pang Xuelin is going to do today is a similar job.

He is going to write the related algorithms of video decoding inside the FPGA and turn it into a video decoding chip.

The so-called FPGA, the Chinese name is Field Programmable Logic Gate Array, which is actually a semi-customized circuit in an application-specific integrated circuit, which can effectively solve the problem of a small number of original device gates.

The basic structure of this chip includes programmable input and output units, configurable logic blocks, digital clock management modules, embedded block RAM, wiring resources, embedded dedicated hard cores, and embedded functional units at the bottom layer.

Since FPGA has the characteristics of rich wiring resources, reprogrammable and high integration, and low investment, it has been widely used in the field of digital circuit design.

The FPGA design process includes algorithm design, code simulation and design, board machine debugging, the designer and the actual needs to establish the algorithm architecture, use EDA to establish the design scheme or HD to write the design code, through code simulation to ensure that the design scheme meets the actual requirements, and finally carry out the board Level debugging, use the configuration circuit to download the relevant files to the FPGA chip, and verify the actual operation effect.

Pang Xuelin cut the interface of the telephone line short, connected the two exposed copper wires to the interface on the single-chip microcomputer, and then he began to press the telephone.

Mu Donglai saw some tricks, and he was a little stunned and said, "Xiao Pang, what are you doing?"

Ever since Mu Qingqing and Pang Xuelin came back from the outside together talking and laughing together yesterday, Mu Donglai started calling Pang Xuelin Xiao Pang.

Naturally, Pang Xuelin didn't care too much.

Seeing Mu Donglai's curious expression, Pang Xuelin laughed, nodded and said, "Make a video decoding chip."

"Video decoding chip, what is this for?"

Pang Xuelin pointed to the LD player on the side and said, "Professor Mu, I'll make a gadget similar to this one. When the time comes, we can burn the video information into a CD, and play movies and TV shows with a single CD."

Mu Donglai was slightly taken aback, and asked curiously, "Xiao Pang, don't we have a laser player? What's the use of making another one?"

Pang Xuelin laughed, and said to Liu Qi beside him, "Brother Liu, how much did you spend on this LD laser disc player?"

Liu Qi said: "More than eight thousand, I forgot the exact number."

"What about your discs?"

Liu Qi was stunned for a moment, and said, "A piece is about four or five hundred."

Pang Xuelin said: "Then do you know how much these parts I bought?"

"How much?"

"It's less than one thousand and two, and if I make it and play it on a CD, the cost price of a VCD disc is only a few dollars!"

Mu Donglai and Liu Qi looked at each other with a shocked look on their faces.

Liu Qi was surprised: "Brother Pang, is this what you want to do big business?"

Pang Xuelin laughed and said: "I also arrived at your house two days ago. When I saw these LD discs, I suddenly thought that in the past few years, it has been possible to compress a movie to six or seven hundred megabytes through MEPG technology. The size can be burned into a CD. In this way, we can use an ordinary CD player to input the video signal to the TV, which has an effect similar to that of an LD player! Think about it, such a The cost of a DVD player is only about 1,000 yuan, and the price of a disc can be reduced to less than 10 yuan. If we launch it, will there be a market for it?"

Liu Qi blushed with excitement, and said: "This... how can there be no market for this, this is simply a huge deal with huge profits!"

Immediately afterwards, he rubbed his hands together, and said a little embarrassedly, "That...Brother Pang...that...I..."

Pang Xuelin looked at Liu Qi with a half-smile and said, "Brother Liu, do you want to join?"

Liu Qi said with a smile: "That's what I mean, Pang...Brother Pang, I'm willing to pay one million. You just...just give me 10% of the shares!"

Mu Donglai and Mu Qingqing couldn't help but look at each other. According to what Fatty Liu said, isn't Pang Xuelin's technology directly worth nine million?

This is nine million!

In this era, although a net worth of nine million is not a huge fortune, it is enough to become the richest man in a certain city.

Even though Mu Donglai is a university professor, his income has been increasing year by year, and his family's savings are only a few hundred thousand.

But Pang Xuelin only spent a day buying a few electronic components and assembling them, and he has such a net worth.

This is too incredible!

Pang Xuelin said with a smile: "Brother Liu, let's talk about this after I finish assembling this VCD player. If the experiment is successful, you can consider investing. In addition, I won't take advantage of you. Since you pay one million, then I also offer one million, plus my skills, you two and eight!"

Liu Qi was so excited that the fat on his face trembled, and said: "Okay, brother Pang, then it's settled, but I'll take 10% of the shares. Even so, I've already taken advantage of it. You first I'm busy here, I'm going to collect money now!"

Liu Qi turned around and left.

Pang Xuelin couldn't help crying and laughing, he never thought that Fatty Liu would enter the game so decisively.

At this time, Mu Qingqing looked at Pang Xuelin and said, "Brother Pang, are you using the phone to enter the machine code?"

Pang Xuelin smiled and nodded, "Qingqing, do you understand this too?"

Mu Qingqing shook his head and said: "I don't really understand. Last year we were selected as the national team for the Physics Olympiad. When we were training at Tsinghua University, the teacher once told us some principles of computers, saying that our country developed the first and second generation computer systems. At that time, using punched paper tape to input instructions should have the same effect as yours."

Pang Xuelin nodded and said with a smile: "In principle, it's about the same."

Mu Dong looked at it for a while, and felt a little boring, so he said: "Xiao Pang, then you go to work first, and I won't bother you! Qingqing, don't talk to Xiao Pang, and disturb him to write codes."

"Know it!"

Mu Qingqing said.

After coming out of Pang Xuelin's room, Mu Donglai thought about it, then returned to his room, then picked up the phone on the bedside table, dialed a number and went out.

After a while, someone picked up the phone: "Hello, who is it?"

"Old Qi? I'm from the east."

"Donglai, I was just looking for you. Yesterday you came to me single-handedly without even bringing Qingqing with you. We haven't seen each other for so many years. It's too rude to eat in the school cafeteria yesterday. I I told my wife today that I will cook a good meal at home tonight, and then you will bring Qingqing to the house for dinner."

Mu Donglai said: "Old Qi, that's not the reason I'm looking for you. I have something to ask you. Don't you work in software engineering at Sun Yat-sen University? Do you know VCD?"

"VCD? What VCD?"

"It is a technology that burns movies, TV series, etc. into a CD, and then connects it to a TV through a CD player, and plays it on the TV."

Qi Aimin was slightly taken aback, and frowned, "Where did you get this idea?"

"You remember that amazing little guy I met you on the train yesterday, he said, and he is now making this machine himself, and it seems to use telephone 0, 1 into the integrated circuit chip Injecting machine code... I don't know much about this, so I want to ask you, is this thing reliable?"

Qi Aimin was stunned for a long time, and said in disbelief: "You mean, the little guy's phone enters machine language into the chip?"

"That's what he seems to say."

"Where do you live? I'm going to find you now."

Mu Donglai thought about it, and reported the address of Liu Qi's home to his old classmate.

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