After months of anxious waiting and suffering, the first chip factory that Dr. Chang and Dr. Yu devoted their efforts to finally successfully commissioned and carried out trial production in May 1983.

The trial production product is 16K MOS dynamic memory, a relatively mature product, and the process is not complicated, but it is a very test of the performance of the production line.

The dynamic memory structure is simple, with only one or three transistors forming a memory cell, depending on the structure. The key to manufacturing memory is integration, and the process requirements are high when hundreds or thousands of memory cells are grouped together to form an array, and the line widths between each other must be reduced to the limit, so the process is very demanding.

This is also why the technical indicators of a chip factory and even the level of integrated circuit technology in a country are always expressed by the capacity of monolithic memory, the competition in this area can be described as cruel, the United States, Europe, and Japan are racing against time to improve the capacity of dynamic memory, among which Japan is the most perverted.

The little devil founded the country with heavy industry, engaged in "things as a day" for decades, believed in the entity, knew how to sprint difficulties with the power of the country, and finally broke through the integrated circuit manufacturing technology, so that Japanese companies have international competitiveness, and can compete with the Americans for MOS memory manufacturing.

Although Cao Changjiu's chip production line is designed according to the latest technology that is public, he does not dare to hold it up, but only chooses mature things for trial production, and strives to succeed at one time, leaving no troubles, and time waits for no one.

On the day of the trial production, Dr. Yu and Cao Changchang were waiting for a long time, and they personally checked every link. The raw material is imported high-purity 3-inch silicon monocrystal, and the price is quite high.

Integrated circuit chips are claimed to be more expensive than gold, but the cost of materials is lower than that of garbage, and the reason is that the raw materials are made of ubiquitous sand.

However, refining and purifying the silicon in the sand requires a considerable process, and the cost is staggeringly high. Wafers alone are not enough, there are 89 production processes in the whole process, each of which is a pass, and it is difficult to control the yield rate at more than 8 or 90 percent.

As a branch of the precision printing industry, the most unsightly thing about the chip process is dust and defects, not to mention that almost hundreds of processes have to be transferred.

Therefore, the pass rate of each process has become the key, even if it is 99%. It's very simple, 99% of a process is qualified, so how many processes are left to be used after nearly 100 processes?

Therefore, Dr. Yu and Changjiu have been inspecting each process one by one to ensure perfection. Dr. Yu is a veteran, he did this back then, so he knows it well.

Long term is a lifetime hand, but fortunately, he doesn't need to do anything in his current position, just stand there and watch.

It takes a long time to filter all the processes, and a whole week has passed, and I can't help but be confused for a long time.

"Uncle Yu, aren't you going to give birth on a trial basis?"

"Young people don't have to be impatient!" Dr. Yu said, "If you don't have three, two, three, how dare you go to Liangshan!" We've been waiting for more than a year, and we still care about this time, although we have a little money, we can't afford to build it, and it's still good to be well-prepared." ”

I still understand the truth of sharpening his tools in advance for a long time, but I didn't say anything. He also sees Dr. Yu's hard work these days, everyone has taken the lead, can he not express his head for a long time?

After a busy week, the production line started quietly, and wafers were spinning and baking in the furnace like toast. A single piece of dust can scrap an entire wafer, and everyone has to wear chemical protective clothing to prevent all kinds of contamination.

This production line is not fully automated, and there are still people doing some necessary work in it, and everyone is cautious, and there is hope in their hands.

In exactly 72 hours, the first batch of 16K memory wafers was baked, and after cutting inspection, an approximate yield figure was estimated.

"Seventy-eight percent, huh. Dr. Yu muttered, his face unmoved.

I didn't know if this data was good or bad for a long time, so I had to ask: "How is Uncle Yu, can it be done?" ”

Dr. Yu smiled: "It's okay, I believe it will be better after our process parameters are fine-tuned." ”

"That's a success!" "Long held a finished wafer and exclaimed excitedly, "Hooray!"

This is a 16Kbit mos tube dynamic memory that is based on a single-transistor memory cell structure that uses two layers of polycrystalline film to separate the three layers of the circuit, as if the circuit board was layered.

The two-layer polycrystalline structure can make the whole integrated circuit have better wiring efficiency, which is equivalent to a circuit board with two layers can be reduced by half compared with the area of a single layer.

This is a revolutionary improvement in the memory manufacturing process and was developed by Dr. Yu himself. The Americans realized this process as early as 1975, and Huaxia did not have such a technology in this era, so this success can be regarded as a small breakthrough.

To create two layers of polycrystalline film, a 7-layer mask is used for this dynamic memory. The so-called mask is just a translucent plate engraved with graphics.

We all use cardboard to write or draw patterns, and then hollow out according to the figures, and spray paint to make a word or pattern out. The same is true for integrated circuits, except that light replaces painting, and mask replaces cardboard.

Most of the masks used in the integrated circuit production line are quartz glass, the surface is sprayed with metallic chromium, and photographic technology or electron beams are used to sensitize the light, and then the mask with a pattern is made by acid washing.

For a long time, the resolution of their factory equipment can only reach 1~3 microns, and they can only carry out step-by-step projection, close to normal graphics, and the seven-layer mask is used for this.

With a three-inch silicon wafer and a five-micron production technology, the entire 16K dynamic memory has a chip area of about 19 square millimeters, which is very small and exquisite.

16K memory has long been an obsolete product, and five-micron technology is far from the limit of this factory, but this is all considered by Dr. Yu.

The production line has just been running, various process conditions need to be run-in, and the quality of personnel must also be improved.

Fortunately, nothing went wrong, and everything was as Dr. Yu expected.

"For a long time, we can hold a press conference. Dr. Yu let out a sigh, "It seems to be working well so far, and the next step is to use 2-micron technology to trial produce the 021 improved model." ”

You don't have to worry about this for a long time, there are already a group of people in the company who specialize in this. On May 18, Digital Oriental held a grand press conference at the Peninsula Hotel, inviting reporters from various media to announce to the public that Digital Oriental's chip factory had been successfully put into trial production and would soon be exported for supply.

It's a pity that it seems that the Hong Kong government doesn't pay much attention to this news, and most of the reporters who come are errands. However, foreigners attach great importance to this, and a large group of people sat in the front row, and all kinds of heavy equipment were put on the table, as if they were waiting to take pictures.

I haven't seen this big scene for a long time, and as soon as I got on stage, I was dazzled back by the flash.

After a long pause, I simply didn't look at the following, took out the speech and began to read it aloud. A series of data indicators came out, and the foreigners below were stunned.

Speaking of the heart, he took out a scrapped wafer that had been prepared for a long time and made a pose for the guy below.

This is a common scene in long-term dreams, and he is very envious of those human-looking guys standing on the podium with a wafer in their hands. It's really exciting to have a long time today, this is his own product, and his dream has finally come true.

Those reporters had never seen this posture, and suddenly the flash lights went loud, and a classic photo was born.

The next day, the news was published in major newspapers, and the subject was a photo of a young man holding a glittering silicon wafer in his stupid hand.

Hong Kong's "Ta Kung Pao" made a short comment on this news, praising the development of local high-tech industries in a high-profile manner, and also expressed great interest in Changchang himself, because this guy is too young.

Foreign newspapers also reprinted it, but most of them despised or ridiculed it, because the DRAM manufacturing technology that had been demonstrated at the conference for a long time was still at the level of the United States for 75 years, so it did not regard him as a threat at all.

Only Miyamoto came running over and asked about the supply.

At this time, of course, I confidently promised him that the first batch of goods would be out in a month, and you should get the money ready.

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Today is really not going well, but I still persevere......

Brother Aran's words are reasonable, they will not serve......