Pang Xuelin looked at the girl with a determined face in front of him a little helplessly, thought about it, and said, "Qingqing, I'm sorry, but I still can't accept you." ”

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

"Then so be it!"

In Pang Xuelin's opinion, Mu Qingqing will go to Xiangjiang University next, and as time goes by, the time for the two to meet decreases, and the other party will naturally gradually forget about himself.

But Mu Qingqing had already made up her mind to go to Landa to study for a few months.

"When Brother Dang sees me, he should be very surprised and happy. Sincerely, Brother Da will open his heart to me one day. ”

Mu Qingqing secretly cheered herself in her heart.

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

Next, Pang Xuelin and Mu Qingqing walked around the banks of the Pearl River again, and then returned to Liu Fatzi's home.

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

"Brother Pang, I have already asked someone to arrange it for you, and when the time comes, I will be escorted by a special person, and I will take the path from the snakehead over there in the deep city, and I will also prepare this ...... for you."

As he spoke, Liu Fatzi took out two documents and handed them to Pang Xuelin.

"What is this?"

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

Liu Fatzi grinned and said: "Brother Pang, they are all fake, in case you encounter a temporary inspection inside, these two fake certificates will be used." The border defense certificate is too difficult, and it has to go through three procedures: the political examination of the unit, the verification of the police station, and the certification of the public security bureau. If you don't have a unit, it's even more difficult, and it needs to be reviewed by the neighborhood committee, and the application procedure is very complicated......"

Pang Xuelin smiled and said, "Lao Liu, then it's troublesome for you, by the way, when are we going to Shencheng?" ”

Liu Fatzi 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's enough?"

Liu Fatzi looked at Pang Xuelin puzzled.

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 the packaged components with a box.

After the invention of VCD, between 94 and 98, there was a peak period in China to transform CD into VCD.

In those years, a decoder board is often hundreds of thousands, the earliest is a three-wire decoder board, requiring your CD or optical drive to find the data in the DSP feet, there are many companies in the list of DSP chips, the main function feet are listed, only need the decoder board to connect to the CD servo board of these three wires plus the ground wire, the decoder board can output VCD video, later, but also in order to save trouble for lazy people, developed a pre-card, it input RF (or EFM) output is these three signals, after combining the twoIt can be adapted to almost any well-known and unknown DSP, as long as the line can find the RF, it can be solved.

But now, VCDs have not yet been born, and video decoding boards are only available in C-CUBE, a company founded by Chinese-American Sun Yansheng.

Pang Xuelin could only build it by himself.

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

In addition, there are tools such as multimeters, soldering irons, fluxes, and solder wires.

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

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

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

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

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

"Phone? What are you doing? ”

Liu Qi was puzzled.

Pang Xuelin smiled slightly and said, "You get it first, and I'll explain it to you when 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 WIN98 ERA, THERE WAS A TIME WHEN A NETIZEN'S SYSTEM CRASHED, AND THE NETIZEN WAS A COMPUTER IDIOT, AND HIS FRIEND INTRODUCED HIM TO A COMPUTER MASTER TO HELP HIM FIX THE COMPUTER.

Because the other party didn't have a WIN98 installation disk, the computer master asked someone to give him the landline, he connected the empty end of the phone line to a jack on the computer, entered DOS, and then began to press the keys on the phone non-stop.

He pressed the keys very quickly, but only pressed the two keys 0,1.

The netizen didn't understand what the use of this was, but he didn't dare to ask, and after watching it for more than half an hour, the computer master still kept pressing these two buttons.

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, and the netizen got up and went to the next door to see that the computer was being debugged in WIN98.

It wasn't until later that he slowly got to know the computer, and finally understood that the master at that time had programmed a WIN98 system in machine language.

He later asked his friend about the whereabouts of the master, and his friend said that he had not heard from him since he had gone to the United States a few years earlier.

This paragraph was widely spread at the beginning of the 21st century when the Internet first began to develop, and many netizens who were new to computers were yearning for hacker masters.

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 wants to do today is a similar job.

He plans to write the relevant algorithms for video decoding inside the FPGA and turn it into a video decoding chip.

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

The basic structure of this chip includes a programmable input and output unit, a configurable logic block, a digital clock management module, an embedded block RAM, a wiring resource, an embedded dedicated hard core, and an embedded functional unit at the bottom layer.

Due to the characteristics of abundant wiring resources, high reprogrammability and integration, and low investment, FPGA has been widely used in the field of digital circuit design.

The FPGA design process includes algorithm design, code simulation and design, board debugging, the designer and the actual requirements 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 board level debugging, the configuration circuit is used 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 copper wires exposed inside to the interface on the single-chip microcomputer, and then he began to press the telephone tick-tock.

Mu Donglai saw some fame, and said a little dumbfounded: "Xiao Pang, what are you doing here?" ”

Since yesterday I saw Mu Qingqing and Pang Xuelin talking and laughing and coming back from outside, Mu Donglai began to call Pang Xuelin Xiao Pang.

Pang Xuelin naturally didn't care too much.

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

"Video decoding chip, what does this do?"

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

Mu Donglai was slightly stunned, and said with some curiosity: "Xiao Pang, don't we have a laser disc player?" What's the use of you making another one? ”

Pang Xuelin laughed and said to Liu Qi on the side: "Brother Liu, how much did you spend on this LD laser machine?" ””

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

"And what about your discs?"

Liu Qi was stunned and said, "One 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 1,000 two, and if I make it and play it on a CD, a VCD disc costs 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 a big deal?" ”

Pang Xuelin laughed and said: "I also arrived at your house two days ago, and when I saw these LD discs, I suddenly thought that in recent years, MEPG technology has been used in the world to compress a movie to six or seven hundred megabytes, which can be burned into a CD disc. In this way, we can use a normal CD player to input the video signal into the TV, which has a similar effect to the LD player! Think about it, the cost of such a DVD player is only about 1,000, and the price of the disc can be compressed to less than 10 yuan. ”

Liu Qi's face flushed with excitement and said, "This ...... How can there be no market, this is simply a big business with a lot of profits! ”

Immediately afterwards, he rubbed his hands and said with some embarrassment: "That...... Pang Brothers...... That one...... I ......"

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

Liu Qi smiled: "That's what it means, Pang ...... Brother Pang, I am willing to pay a million, you only need to ...... Just give me 10% of the shares and you're good to go! ”

Mu Donglai and Mu Qingqing couldn't help but look at each other, according to Liu Fatzi's statement, isn't it Pang Xuelin's technology, which is directly worth nine million?

That's nine million!

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

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

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

It's incredible!

Pang Xuelin said with a smile: "Brother Liu, let's wait for me to complete the assembly of this VCD player, if the experiment is successful, you can consider investing." In addition, I don't take advantage of you, since you give a million, then I will also pay a million, plus my technology, you two and I eight! ”

Liu Qi was so excited that the fat on his face trembled, and said: "Okay, Brother Pang, then it's decided, but I'll still take one percent of the shares, even so, I have already taken a big advantage." You get busy here first, I'll go and scrape together the money now! ”

Liu Qi turned around and left directly.

Pang Xuelin couldn't help crying and laughing, he never thought that this Liu Fat Man 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 nodded with a smile and said, "Qingqing, you also understand this?" ”

Mu Qingqing shook his head and said: "I don't understand very well, last year we were selected for the national team of the Physics Olympiad, when we were training at Tsinghua University, the teacher once told us some principles of computers, saying that when our country developed the first and second generation computer systems, we used perforated paper tape to input instructions, which should be similar to 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 bored, so he said: "Xiaopang, then you are busy first, and I won't bother you!" Qingqing, you don't talk to Xiao Pang and bother him to write code. ”

"Got it!"

Mu Qingqing said.

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

After a while, the phone was answered: "Hey, who?" ”

"Old Qi? I'm from the East. ”

"Donglai, I was looking for you, yesterday you guy single-handedly came to me, not even Qingqing, we haven't seen each other for so many years, and I only had one meal in the school cafeteria yesterday, which is too rude. I told my wife today, cook a table of good dishes at home tonight, and then you bring Qingqing to the house for dinner. ”

Mu Donglai said: "Old Qi, I didn't look for you for this. I have something I would like to ask you about, aren't you doing software engineering at Sun Yat-sen University? Do you know VCDs? ”

“VCD？ What VCD? ”

"It's a technology that burns movies and TV dramas into a CD disc, and then connects them to a TV through a CD player and plays them on a TV."

Qi Aimin was slightly stunned, frowned, and said, "Where did you get this idea?" ”

"Do you remember the amazing little guy I told you yesterday about on the train, he said, and he's building this machine himself, and he seems to be using a telephone 0 or 1 to inject machine code into an integrated circuit chip...... I don't know much about this, so I'd like to ask you if this thing is reliable? ”

Qi Aimin was stunned for a long time, and said a little incredulously: "You mean, that little guy's phone input machine language into the chip?" ”

"That's what he seems to say."

"Where do you live? I'll go to you now. ”

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