Siheyuan: Starting from a fitter

Chapter 154 Happy little cotton-padded jacket

The study plan is also relatively simple. It is tentatively planned to focus on high school mathematics, physics, chemistry, and English every Saturday afternoon.After passing the exam, you can consider self-study in college mathematics, algebra, and physics.

Based on the textbooks from Xinhua Bookstore, Li Guocheng combined with the knowledge of later generations and added some knowledge.

Let's look at Wu Liankui's opinion at that time, and Li Guocheng has brought his thinking back to the hard disk design.

It is initially considered to be composed of 5 disks. The first 4 disks each store 8MB of data, and the fifth disk stores the boot bit. The total storage capacity is 5MB of data.

接口采用4组差分串口，时钟自提取，电源采用12V和5V供电。12V给主轴电机供电，5V给电路板供电。接口差分特征采用RS485接口标准。

In 1963, IBM launched the first removable hard drive, the 1311, which had six 14-inch platters, a capacity of 2.6MB, and looked like a small refrigerator.

This is the gap between the times. With the experience of later generations, subtle telepathy, special integrated circuits, and low-power bus mechanisms, Li Guocheng can design smaller and larger hard drives.

Taking into account the stability of operation and heat dissipation, the entire machine casing is made of die-cast aluminum.In order to reduce the weight of the magnetic head, the magnetic head arm is made of aluminum alloy + thin steel sheet. Both parts need to be molded, one for pouring and the other for stamping.

In just two days, Li Guocheng completed the mechanical structure design of the entire hard drive in his mind, but it took two weeks to transform it into a blueprint.

"Xiao Zhou, this is a complete set of drawings of the hard drive's mechanical structure and external interface. It still lacks a control circuit. These reserved mounting holes are where the circuit board is placed."

Li Guocheng pointed to the design drawings and explained them to Zhou Xiaojuan one by one.

Zhou Xiaojuan looked at the dimensions on the drawing and said, "This is too delicate. How can we produce it? But the entire hard drive is so small and beautiful."

A girl's perspective is always so novel.Because Li Guocheng had explained to everyone the currently commonly used storage methods and sizes, Zhou Xiaojuan was deeply shocked when she saw the drawings. It was not Li Guocheng's past successful experience, and she doubted the possibility of realization.

Li Guocheng turned over the mold drawings and said, "These drawings are for various molds. Ask Gong Wang or Master Yi if we can produce them? If it is difficult, just get the information and I will do it myself."

Zhou Xiaojuan has no objection to this point. Li Guocheng is a humanoid precision lathe, and it is a multi-axis linkage precision lathe.Thinking of this, she suddenly had an idea.

"Brother Li, when will you make a 4-axis CNC machine tool?"

Li Guocheng was stunned when he was asked. This change was too fast. "When we complete the computer design, we can consider setting up a team to specifically cooperate with Wang Gong in designing CNC machine tools."

"Hey, we were discussing the hard disk drawings, why did you end up on the CNC machine tool? Take a look at these drawings first. If you have any questions, come to me."

"Hehe, I got it, Brother Li."

Next, he designed a dedicated hard disk chip. Because he had a basic understanding of the interface standards, the design was simplified based on his understanding and current circuit implementation capabilities. The total interface speed is only 20Mbps, but it is several times faster than all current external buses. .

Another week passed, and the hard drive dedicated chip design was completed. At the same time, the circuit board was also completed simultaneously.Li Guocheng handed the two masks and design information of the chip and circuit board to Zhou Xiaojuan.

"Brother Li, you are going too fast," Zhou Xiaojuan shouted. Everyone in the room turned to look at the two of them, and the experienced ones secretly laughed.

In offices of this era, men gather together and always love to drive, especially Wang Dayong, who always laughs at others heartlessly.

Li Guocheng had a dark look on his face.Zhou Xiaojuan realized something was wrong and quickly apologized for her yelling.

Li Guocheng knew that she did it unintentionally, "Xiao Zhou, arrange the delivery as soon as possible, and if you have any difficulties, please ask."

"Brother Li, Master Yi and others reported that the mold is too delicate and they can't make it. The materials will be sent to your workbench in a moment."

"Okay", Li Guocheng turned and left.

Zhou Xiaojuan is under a lot of pressure now. Li Guocheng completed the design of the structure, chip and circuit board in less than a month. They have just made progress now.

Based on past experience, the chips and circuits designed by Li Guocheng were basically a success. It enhanced their confidence and virtually set a benchmark for the chip manufacturing industry. When they later came into contact with the chip design process of other companies, they Realized how perverted Li Guocheng was.

Li Guocheng has now returned his energy to his family, and Zhao Ting may give birth at any time.Although Zhao Ting felt that she could still go to work, Li Guocheng firmly disagreed and had to submit, but she was happy in her heart.

The mother-in-law and grandma prepared a lot of diapers, all of which have been used before, saying that the used diapers are more protective of the children's skin.Li Guocheng smelled the camphor on the diaper and felt really uneasy.

Take out a large iron pot, throw all the diapers washed in clean water into the pot, boil the water for 10 minutes, spread out the diapers and hang them on the clothes drying wire in the yard.

The diaper, which was still steaming just now, became stiff after a while.It is rare today that there is only a slight breeze, and the warm winter sun shines on the diapers, which I firmly believe can sterilize bacteria.

After observing for a while, Li Guocheng is now a little confused. Can the diapers frozen into borneol absorb the heat of the sun? Will they still have the smell of the sun after drying?

In the afternoon, the wind became much stronger. Li Guocheng hurriedly took all the "dried ice flakes" into the living room, stacked them together, and hung them by the stove.Sitting by the stove and watching the diaper dry, the side near the stove was dried before dinner.

When you put your nose close and inhale hard, you can smell the water vapor.Li Guocheng rubbed his nose, walked to Zhao Ting and sat down.

Throughout the day, all Li Guocheng's actions were seen in the eyes of the three women at home (mother-in-law, Aunt Liu and Zhao Ting). Their focused (silly) expressions often made them in the room laugh out loud.

When Li Guocheng sat next to Zhao Ting with a depressed expression, he almost gave birth to a baby.

Li Guocheng was so frightened that he hurriedly helped her calm down, "What's wrong with you?"

As soon as she finished speaking, Zhao Ting clutched her stomach and started to ouch. What started as a smile on her face turned into a pained expression.

The experienced mother-in-law made a simple examination and immediately urged Li Guocheng to send Zhao Ting to the hospital.

At about 9 o'clock that night, a little girl weighing 7 pounds and 2 taels was born. The faces of the three women who knew the result were a little uncomfortable, but Li Guocheng didn't care at all. His whole mind was immersed in his little daughter, and he never left her.

Looking at the little man with wrinkled and slightly red skin, Li Guocheng's heart melted.The daughter is the little lover of the father in the previous life, and the daughter is the little cotton-padded jacket of the father.

Seeing Li Guocheng happily touching the little guy carefully, the three women finally slowly showed their smiles.

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(End of this chapter)