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After the corrosive agent is blended. Lin Yan took out a wide scotch tape and carefully pasted it on the copper foil board he bought. He sticks very slowly, and his hand is steady. When he had all pasted this side, he held up the foil plate and looked at it in the light.

It can be seen that the tape is tightly attached to the copper foil plate without a single air bubble.

After inspecting this side, Lin Yan began to paste the other side again. After attaching the other side, check again for air bubbles.

After confirming that there was none, he took out his pen and drew a pattern on the tape.

After the pattern was drawn, he took out a carving knife with a sharp tip. With a flash of cold light, it cut towards the copper foil board.

If there were people who knew how to do it now, they would know what Lin Yan was doing, he was making printed circuit boards.

To make a printed circuit board, it is to use something with strong corrosion resistance, such as glue, to leave a printed circuit diagram on the copper foil board. The copper foil plate is then placed into a chemical agent to corrode away the excess copper foil. The part that was covered with gum was left behind. After that, it is taken out and washed off with clean water, and finally the surface gum is removed, and after polishing, it becomes a printed board with a circuit diagram.

Lin Yan cut the tape very quickly. Because of the passage of time, the adhesive may stick to the copper plate. If it is not cleaned, it will affect the subsequent corrosion. If rework is required due to incomplete corrosion, the printed board that enters the corrosion pool will be scrapped.

Yuki Sakata, who cut the particleboard and cut it halfway, saw Lin Yan's rare serious appearance, and also came over.

When he saw the copper foil board, the yellow copper foil, and the light reflected by the tape. And, under the clear boundaries of the two contours, the criss-crossed, complex, and modern industrial aesthetic circuit diagram is exposed.

He opened his mouth wide and said in surprise, "Xiaoyan, you did this?" ”

Although Sakata Yuki didn't understand what Lin Yan was doing with this thing. But what does it matter, just look good.

"Well, I did it." Lin Yan looked at his work and was quite satisfied. However, now is not the time to be complacent, Lin Yan pushed Sakata Yuki and said, "You go to make that cabinet first." I'm going to have to get busy for a while. ”

Lin Yan said as he spoke, and carefully checked his hand. After all, the stickiness of the tape is not small, no matter how fast Lin Yan's action is, it is impossible to leave no residue at all. At this time, you need to use a small file with a flat mouth to pick off the glue little by little.

Clean up the copper foil board. Lin Yan took it and came to the side of the corrosion solution that had been configured. He gently lowered one side first, and the other end was a glass rod. He moved slowly, trying not to splash the liquid, and even more carefully not letting the thing spill on his hands.

As soon as the copper foil plate was put in, it reacted with the corrosive solution. The basin was bubbling out, as if boiling water was about to boil.

The speed of corrosion is not fast, Lin Yan glanced at his watch, eight o'clock in the evening. It takes about two hours to complete the corrosion.

During this time, you don't have to sit here and wait, you can do the arcade support frame first.

Because of the picture tube, the console and these things are heavier. Therefore, it is not enough to rely on the simple framework that comes with it.

What's more, this part of the console is not only ravaged by the players for a long time, but also may be beaten by the players because they lose the game.

Therefore, to sum up, it is impossible to do without a strong support frame. How embarrassing it would be if the console fell apart after only one day of being put out.

This part of the steel frame is best used for welding. It's a pity that Lin Yan didn't borrow welding equipment, so he had to give up this idea of being fast, convenient and sturdy.

Instead, it was changed to screw fixing. However, screws are easy to loosen, so it is not a long-term solution.

At 9:40, Lin Yan, who was sweating profusely, finally completed the assembly of the arcade frame. And Yuki Sakata, on the other side, also finished the shell of the particleboard.

Lin Yan glanced over and saw that the degree of completion was very high, and Yuki Sakata did a good job.

Because the particles of the particleboard are relatively coarse, Yukito Sakata used a file to smooth out the uneven saw edge. After that, a plaster cast was applied to it and it was polished again. After a few steps, a decent arcade case is made.

Ten o'clock in the evening. Lin Yan used a hook made of iron wire to scoop up the circuit board. It can be seen that the copper foil, which has been exposed to the corrosive solution and does not cover the place of the tape, has been corroded cleanly, revealing the green resin substrate underneath.

Yuki Sakata, who finished making the arcade shell, brought a large basin of water under the instructions of Hayashi Hiko. As soon as the circuit board was taken out of the corrosion solution, it was put into clean water. Not only that, Lin Yan also took out a soft-bristled brush and brushed all the residual liquid on it.

It is an early practice to use chemical solution to corrode copper circuits, and chip production is also to learn this technology, and the chemical solution will not partially corrode off the silicon wafer substrate. The advantages of this method are low cost and technical simplicity, but it also has significant disadvantages.

The potion not only corrodes downwards, but also spreads to the periphery.

Although there is a gel on the surface to protect the important parts, the potion will naturally corrode along the bottom of the gel to the side after it has corroded. The printed board is better, the circuit is relatively wide, and a little corrosion has little effect, but for the chip, the line width is very narrow, and a little more corrosion may destroy the integrity of the circuit.

In order to ensure that there was no residue of the potion, they changed the water twice before giving up.

The next step is to take a drill bit with a diameter of 0.2 millimeter and drill holes in the circuit board against the reserved component pins.

"Squeak...... Poof......"

"Squeak...... Poof......"

……

"Squeak...... Poof......"

Yuki Sakata, who was playing on the side, was stunned. There are thousands of pins in total. Lin Yan came out one by one like this. In the process of drilling, time passes quietly.

During this period, Yuki Sakata called home and said that he was staying at Lin Yan's house tonight.

It's not that Sakata Yuki didn't think about drilling instead of Lin Yan, but Lin Yan shook his head and refused, because, in case there was a little mistake. This board is scrapped. He couldn't have taken such a big risk and handed this over to Yuki Sakata.

"Whew......" Lin Yan took a long breath, "Xiao Xing, help me use fine sandpaper to smooth out the rough places of the protrusions, don't wear them out lightly." ”

"Okay." Yuki Sakata was stunned for a moment before replying. The time has passed twelve o'clock, and it came to the next day, although Sakata Yuki was a little sleepy when he saw Lin Yan drilling, he was still impressed by Lin Yan's perseverance, more than a thousand holes, his hands were so steady, he drilled them down one by one, there was no mistake at all, it was simply amazing.

Lin Yan rested for a while, put the corrosion solution into a plastic bucket, labeled it, and put it aside. Then, start disassembling the CPU on the broken computer.

――――――

Probably over-borrowed...... The 6502 CPU mentioned above, I was mistaken, it was not produced by Motorola, but by MOS Technology. Their relationship is probably that MOS Technology was formed by Motorola's departing employees. Thank you for the reminder. (The novel "Rebirth Japan Makes a Game" will have more fresh content on the official WeChat platform, and there will also be a 100% lottery gift for everyone!) Open WeChat now, click on the "+" sign in the upper right corner to "add friends", search for the official account "qdread" and follow, hurry up! )