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

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

"Then let it go!"

In Pang Xuelin's view, Mu Qingqing will go to Xiangjiang to study in college next time. As time goes by, the time for the two to meet will decrease, and the other party will naturally gradually forget about him.

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

"Brother Pang will be surprised and happy to see me. The sincerity will open up the gold and stone. One day, Brother Pang will open his heart to me."

Mu Qingqing secretly cheered himself up in her heart.

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

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

In the evening, Fatty Liu went home and told Pang Xuelin that he had arranged a way to pass the second-tier inspection.

"Brother Pang, I have asked someone to arrange it for you. At that time, a dedicated person will escort you, and the snakehead from the other side of the Shenzhen City will walk in the small path. In addition, I have prepared this for you..."

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

"This is?"

Pang Xuelin took it and one copy reads the "Permitted Pass to the Border Prevention Zone" in gold letters on the cover, while the other copy is actually a temporary residence permit for the Shenzhen City Special Administrative Region.

Fatty Liu grinned and said, "Brother Pang, they are all fake. If you encounter a temporary inspection inside, these two fake certificates will be used. The border guard certificate is too difficult. It needs to go through three procedures: political review by the unit, police station verification by the public security bureau. If there is no unit, it will be even more difficult. It requires review by the street committee, and the application procedures are very complicated..."

Pang Xuelin smiled and said, "Old Liu, I'll bother you. By the way, when will we go to Shenzhen City?"

Fatty Liu said: "Depending on the arrangements 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's enough?"

Fatty Liu looked at Pang Xuelin in confusion.

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

The next morning, Pang Xuelin went to Yangcheng Computer City again and brought back the various packed components with a box.

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

In those years, a decoding board was often hundreds or thousands of times larger. It was originally a three-wire decoding board, which required your CD or optical drive to find the data in the DSP foot. There are many companies' DSP chip lists and the main functional pins are listed. You only need to connect the decoding board to the three wires of the CD servo board and add the ground wire to the decoding board to output the VCD video. Later, in order to save trouble for lazy people, a pre-card was developed. It inputs rf (or efm) and outputs 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, the vcd has not been born yet, and only the c-cube company established by Chinese American Sun Yansheng is available in the video decoding board.

Pang Xuelin could only create it temporarily by himself.

Therefore, in addition to purchasing DSP chips, CD-rom, special transformer power supplies, capacitors, resistors and other components, Pang Xuelin also specially bought a microcontroller and an FPGA chip.

In addition, there are multimeters, soldering irons, fluxes, tin wires and other tools.

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

"Brother Pang, what are you doing?"

Pang Xuelin smiled and said, "Make a gadget."

While speaking, Pang Xuelin used an electric soldering iron to solder these DSP chips, FPGA chips and other components to the microcontroller one by one.

Then, Pang Xuelin raised his head and said to Liu Qi: "Old Liu, can you pull out your phone and lend it to me?"

"Tel? What are you going to do?"

Liu Qi was puzzled.

Pang Xuelin smiled slightly and said, "You get it first, I'll explain it to you after I finish it."

In the real world, there was once a joke about top hackers on the Internet.

A long time ago, in the win98 era, a netizen's system collapsed. The netizen was a computer idiot. His friend introduced him to a computer expert to help him repair computers.

Because the other party did not have a win98 installation disk, the computer expert asked someone to give him the landline. He connected the empty end of the phone line into a jack of the computer, entered Dos, and then started pressing the keys on the phone continuously.

It presses the keys very fast, but only presses 0 and 1.

The netizen didn't understand what it was, but he didn't dare to ask. After watching it for more than half an hour, the computer expert kept pressing these two keys.

The netizen gradually became a little sleepy, so he poured a cup of tea for the computer tall and thin, and went to sleep next door alone.

When I woke up, more than four hours had passed. The netizen stood up next door and saw the computer debugging in win98.

Until later, he gradually got to know the computer and finally understood that the master at that time made a win98 system in machine language.

He later asked his friend the whereabouts of the master, and his friend said that he had never heard of him after he went to the United States a few years ago.

This joke was widely spread when the Internet first began to develop in the early 21st century, and many netizens who were new to computers yearned for hackers.

It was not until later that with the popularity of the Internet that people gradually realized that it was impossible to write win98 in machine language.

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

He is planning to write related algorithms for video decoding within FPGA and turn it into a video decoding chip.

The so-called FPGA, called the field programmable logic gate array in Chinese, is actually a semi-customized circuit among application-specific integrated circuits, which can effectively solve the problem of a small number of original device gate circuits.

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

Because FPGA has rich wiring resources, high repeatable programming and integration, and low investment, it has been widely used in the field of digital circuit design.

The design process of FPGA includes algorithm design, code simulation and design, board debugging, designers and actual needs to establish algorithm architecture, use EDA to build design schemes or HD to write design codes, and ensure that the design scheme meets actual requirements through code simulation. Finally, board-level debugging is carried out, and the configuration circuit is used to download relevant files to the FPGA chip to verify the actual operation effect.

Pang Xuelin cut the interface of the telephone line short and connected the two exposed copper wires to the interface on the microcontroller. Then, he began to tick the phone.

Mu Donglai saw some of the names and said in a daze: "Xiao Pang, what are you doing?"

Since I saw Mu Qingqing and Pang Xuelin come back from outside yesterday, Mu Donglai has begun to call Pang Xuelin Xiaopang.

Pang Xuelin naturally doesn't care too much.

Seeing Mu Donglai's curious look, Pang Xuelin smiled and nodded, "Make a video decoding chip."

"Video decoding chip, what is this for?"

Pang Xuelin pointed to the ld video player beside him and said, "Professor Mu, I will make a gadget similar to this. At that time, we will burn the video information into the CD and use a CD to play movies and TV series."

Mu Donglai was slightly stunned and said curiously: "Xiao Pang, don't we have a laser DVD player? What's the use of making another one?"

Pang Xuelin laughed and said to Liu Qi beside him: "Brother Liu, how much does this ld laser DVD player cost?"

Liu Qi said: "It's more than eight thousand, I forgot how much it is."

"What about your discs?"

Liu Qi was stunned and said, "One picture is about four or five hundred."

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

"How much?"

"Not a thousand two, and if I make it and play it in CD, a VCD disc costs only a few dollars!"

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

Liu Qi said in surprise: "Brother Pang, is this what do you want to do a big deal?"

Pang Xuelin laughed and said, "I arrived at your house two days ago. When I saw these LD discs, I suddenly thought that in recent years, I can compress a movie to a size of 600 to 700 megabytes through mepg technology, and can be burned into a CD disc. In this way, we can use ordinary CD players to input the video signal into the TV, which has a similar effect as an LD disc! Think about it, such a DVD player costs only about 1,000 yuan, and the price of a disc can be compressed to less than ten yuan. If we launch it, is there a market?"

Liu Qi's face was flushed with excitement and said, "This...How come there is no market? This is simply a huge deal!"

Immediately afterwards, he rubbed his hands and said embarrassedly: "That...Brother Pang...That...I..."

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

Liu Qi smiled and said, "That's the point, Pang... Brother Pang, I'm willing to pay one million. You just need to... just give me 10% of the shares!"

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

This is nine million!

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

Even as a university professor, Mu Donglai's income has increased year by year over the years, and his family's savings are only about 100,000 yuan.

Pang Xuelin only spent a day buying a few electronic components to assemble them, and he had such a value.

This is incredible!

Pang Xuelin smiled and said, "Brother Liu, let's wait until I complete this VCD player assembly. If the experiment is successful, you should consider investing again. In addition, I will not take advantage of you. Since you pay one million, I will also pay one million. With my skills, you two and I will be eight!"

Liu Qi was so excited that the fat on his face shook and said, "Okay, Brother Pang, that's it, but I'll take 10% of the stocks. Even so, I've taken a big advantage. You can work here first, and I'll go to raise money now!"

Liu Qi turned around and left.

Pang Xuelin couldn't help but laugh and cry, and never expected that Fatty Liu would enter the game so decisively.

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

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

Mu Qingqing shook his head and said, "I don't understand very much. Last year we were selected for the national team of the Olympic physics competition. When we were training at Tsinghua University, the teacher once told us some principles of computers, saying that when our country develops the first-generation and second-generation computer systems, we use punched paper tape to input instructions, which should be similar to yours."
To be continued...