"Da Li, what do you think of what I told you?" After eating, Cao Changjiu and Li Mengyang were wandering on the road, knocking him by the way.

Li Mengyang's face was embarrassed: "I'll try my best, the institute is busy now, and it's a bit difficult to do private work." ”

"It's good if you can do it, I'm afraid you won't, hehe. Cao Changchang said happily.

"That's, who are we with whom, it's also appropriate to help you, besides, your thing is not too complicated, relatively speaking, the layout is simple, I can finish it in a month with a few buddies." Li Mengyang patted his chest and said.

"Okay, when it's done, I'll go to Shanghai to invite a few brothers to drink and celebrate. ”

"Forget it, I'm afraid of you, as long as you don't give me this kind of work in the future, I thank you in advance. It's not that I don't want to help, it's that I really can't spare this time. Li Mengyang smiled bitterly.

"Just this once, I owe you a personal favor. ”

It turned out that Cao Changjiu took the designed CPU to Li Mengyang to lay it out, and Cao Changjiu was embarrassed.

In order to control the scale and production cycle, Cao Changjiu designed it to be 8 bits, but it contains nearly 6000 transistors, 20 bits of address bus, and can access 64K memory space.

It seems that the scale is very large, and one person can't complete it, but Cao Changjiu's CPU is based on RISC architecture, due to fewer instructions, there is not so much complex control logic, and most of the chip area is a regular register structure, so both the design workload and the layout workload are greatly reduced.

This is also a helpless move, Cao Changchang has the ability to design a 32-bit CPU, and the scale is not large, just 3 or 40,000 transistors, the question is whether it can be built under the existing technical conditions in Huaxia?

Even if it is built, the cost estimate is quite scary, with Cao Changjiu knowing the production line of the Shanghai Metallurgical Institute, the 10-micron technology has just passed, and the yield is less than 25%, which is already the top level in China.

If they follow up with the X86 series processors, with the speed of foreign hardware development, it will not be sustainable in two years, because the chip production line cannot keep up, and it is simply impossible to manufacture such a huge scale of integrated circuits.

That's why Cao chose RISC, which has a simple architecture, is easy to manufacture, small in scale and high in speed, and the only drawback is that it relies on a high-performance compiler and a large amount of program code.

The performance of RISC processors is quite dependent on the compiler, and the efficiency of the code compiled by different compilers varies greatly, and the amount of program code with the same effect is large compared to the CISC processor.

This is also the reason why the RISC processor did not grow and develop back then, and it was not until the great breakthrough of compiler technology that the RISC was brilliant.

Taking the 8-bit CPU designed by Cao Changjiu as an example, its instruction set is only 34, and the amount of program code is nearly twice as large as that of 8080, which is really terrifying.

There is also a way to make up for this, that is, to increase the instruction set, but this has to be done step by step, Cao has long thought about it, and there is no need to worry about the software compiler, he himself is an expert in this area.

As for software, Huaxia has never been short of talented programmers, and it seems that the price of memory is constantly falling.

With these studies, Cao Changchang decided to start with an eight-bit RISC microprocessor, which can only be done in a state of insufficient manpower, no funds, and lack of manufacturing technology.

The task submitted to Li Mengyang was not heavy, so he dared to boast that he would take a few people to lay out the map within a month.

With Da Li's promise, Cao Chang has peace of mind, in addition to dangling in the computing office all day long, writing some programs, playing games, and in his dreams, how to conquer the world after his CPU comes out.

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In this way, Cao has been mixed for more than a month, and he is scratching his ears and cheeks there in a hurry, and Da Li's telegram finally came, still with four clean words: success comes quickly.

I couldn't help but snap my fingers for a long time, the excitement in my heart was overflowing, and I ran to the Wang's office while singing.

"You want to take leave?" asked the king, frowning, "Why?"

"I want to go home and see. He made a homesick expression for a long time, infinitely melancholy, "I haven't been home for a long time, and I don't know how Gao Tuan and them are doing." ”

"Oh, then I'll send someone to send you back, I don't worry about you going alone. ”

"Don't, isn't it a critical moment in the office, no one can leave, so can it affect my work?"

"Cut, I didn't see you go back for the New Year, but now I'm energetic. Tell me honestly, what are you doing with leave, otherwise you won't approve it. Wang Suo knew that this student had a lot of tricks, and he really didn't dare to be careless.

"Hehe, you still know me. I went to Shanghai on a personal business. The lie was exposed, and Cao Changchang explained cheekily.

"Private matter? Hmph, I won't ask, anyway, your kid is a donkey's temper, and once you decide, you will not hesitate. Forget it, how many days?" asked Wang Suo as he picked up his pen and wrote.

"It's only a matter of a few days, and it will definitely not be delayed like last time, hehe. Cao Changchang grinned.

"Don't be in a hurry, by the way, go to the metallurgical institute and give me what is written on it. When the king had finished writing, he handed him a piece of paper.

He took it for a while and said, "Okay, no problem." "Turn around and go.

Wang Suo hurriedly shouted: "Pay attention to safety on the road, go and return quickly." "The man is gone.

After a long time, I went back to pack my luggage, and went straight to the train station on the same day, and went to Shanghai.

On the train, he was in a hurry, wishing that the train would speed up to 800 kilometers per hour.

In this way, he rushed to Shanghai in anxiety, and it was already afternoon when he arrived at the metallurgical institute.

Since he came here once, Cao Changjiu was familiar with it, opened a room in the guest house, put down his luggage and went straight to Da Li.

Da Li was startled when he saw him, "God, why did you come so soon." ”

"Nonsense, it's been almost two months, can I not be in a hurry. As soon as you say it's done, I'll catch the train. How's it going?" he said, gasping for breath.

"Yes, there!" Li Mengyang took Chang Chang into another room.

In the room was a large table with a huge drawing of coordinates spread out on it, and the dense lines stretched over it like a huge map of the city.

Cao Chang looked at the drawings excitedly, almost speechless.

"Beautiful, right?" Li Mengyang seemed to be also infected, his eyes were a little confused, "I worked hard with a few brothers, it took more than a month, although the deadline was missed, but it was completed." ”

"I thank you, brothers, I invite you to dinner today!" Cao Changjiu quietly wiped his eyes.

"I have this picture, but how do you take it away?" asked Da Li.

This made Cao Changjiu ask, "This thing doesn't seem to be able to be broken!"

Seeing Cao Chang's embarrassed appearance, Da Li laughed: "Forget it, it's not difficult for you." Send the Buddha to the Western Heavens, I have asked someone to make it into film, and I won't accept you for the film money. But my brother can only help to this extent, and I can't get out of the plate making that costs a lot of money. As he spoke, he took out a small box with a roll of film inside.

Cao Changjiu took the box, and he didn't say anything excited, but kept saying thank you.

Li Mengyang frowned, "Don't be so polite between brothers, a few of us are waiting for you to have a treat." ”

Cao Changjiu immediately agreed, "Call all the brothers, let's not get drunk today!"

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I can't stand it at night, continue during the day!