All companies involved in R&D will sign confidentiality contracts, patent contracts and non-compete contracts with employees.

The first contract has a post-event liability clause, but the main purpose is not to prevent it in advance, to regulate the daily behavior of employees as much as possible, and to prevent employees from inadvertently leaking secrets and causing damage to the company's interests.

The second contract determines the distribution of the benefits of the employee's labor in the company, and the law usually stipulates that the new patent obtained by the employee in the course of working for the company can be signed by the employee, but the ownership of the patent belongs to the company.

The last contract is to protect the company's interests and prevent employees who control key technical details from switching jobs to major competitors, and the non-compete period on the contract is three years.

These three contracts were first remembered by Zhang Heng, and Jiexi worked out them with him, and at the same time got to know him a little deeper.

After Lin Liang explained the three contracts in detail, everyone had no doubts, and soon signed the contract, Lin Liang received the contract and did not leave in a hurry, Zhang Heng had already told him that there might be a new patent to apply for today, and he needed to bring the information to Jiexi.

At this time, Uncle Li was also called over by Chen Zhenning from Xinlong Mansion, and inexplicably waited for Zhang Heng's orders.

"Director Li is here, and I need you to help you solve the mechanical problem today. Zhang Heng greeted, "I want to ask Director Li, what components are generally used to control the direction in mechanical equipment?"

Uncle Li blurted out: "One is the rudder, which is used by cars and ships, and the other is the hand bar, crane, excavator, which is used for driving." ”

The eyes of several engineers lit up, and Zhang Heng asked them, "What do you think is the difference between the two control methods?"

Lu Yundao: "The former is an arc to change direction, and the latter is a straight line. ”

Zhang Heng asked: "Then which arcade do you think is suitable for us?"

"Of course it's a hand stick!" Zhang Zhefeng replied, and the other two thought for a while and nodded slightly.

They weren't wrong, at least for twenty years, the lever that could control the arc-like trajectory would not be of much use, and the straight direction of control was the mainstream of the game.

For a game to be popular, simplicity is king.

Atari's hand lever, Nintendo's handle, are the two classic inventions that best illustrate this truth.

Now that he found the direction, several people gathered around a box, Uncle Li drew the internal mechanical structure of the hand rod, he did not systematically learn mechanical drawing, so the drawing was very tedious, but under his explanation, everyone roughly understood the basic principle.

Atari's knob mechanism is exactly the same as the radio knob, the input is analog, and the lever on the machine is a circuit switch, and the length of the stroke is determined by the circuit on time.

After understanding the operating principle of the manipulator stick, the three young people quickly designed a similar game joystick, the switch circuit on the hand stick no longer specifically drives the machinery or engine to run, but provides a steady stream of digital signals to the arcade main core, and the arcade main core judges the corresponding direction and time, and controls the direction and movement time of the game character.

To put it simply, the stick chooses a direction, which is equivalent to turning on the switch in a certain direction, and the game character on the arcade machine will move in that direction, the movement rate can be set in advance, and the specific movement time is synchronized with the time that the stick maintains in this direction.

For the mechanical part of the hand rod, with the cooperation of Uncle Li, it took everyone more than an hour to basically draw the mechanical structure diagram.

In the corresponding digital circuit design part on the motherboard, the three young people were at a loss, and after discussing for a while, they did not come up with an effective plan with the lowest cost.

Zhang Zhefeng and Lin Wencan advocated the use of IC components to build circuits, but they couldn't think of suitable components for a while.

Lu Yun simply adopted the most primitive method - the underlying design, using various digital doors to build circuits, and used several sheets of A4 paper in a while, but as a result, the calculation errors were frequent, and he entered a dead end, and people became more and more nervous.

"It's going to take a long time, and the two of them should be right. In the end, he reluctantly put down the pen and paper, blushed and looked at Zhang Heng with the other two, like a plea for help.

"If it's for scientific research purposes, and you're doing it all right, and we're doing commercial development, then you don't have to start from the bottom up, it's a very good practice to use the functional modules that are already on the market. Zhang Heng concluded.

This is also the general principle of R&D of Daheng Technology under his leadership.

Some functional modules with broad market prospects, Daheng Technology will definitely find a way to be the first to develop them, and even if there are finished products, in order not to fund competitors, Daheng Technology will not adopt them, and will try their best to bypass the patent and develop it themselves.

For some other modules and accessories that are not too important, Daheng Technology will develop a number of supporting manufacturers to undertake production.

It was still a little early to talk about this topic at this time, and Zhang Heng quickly gave a solution.

It's very simple, with a simplest analog-to-digital signal converter, a 4-bit shift register, and a TI NE555 time-based chip, you can build a handstick signal acquisition system.

The former is used to collect the directional analog signal from the hand stick and convert it into a digital signal, and then store it in the intermediate shift register, while the latter is used to control the working frequency of the entire acquisition system, that is, the timing.

The three of them studied the meeting, nodded frequently, and looked at Zhang Heng's eyes full of admiration, Zhang Zhefeng suddenly said: "Boss, if the hand rod has eight directions, then just change an 8-bit shift register." ”

Zhang Heng glanced at him, nodded and said: "For the time being, there is no need for an 8-way hand rod, of course, if you have kung fu, it is best to make it together, and save two points to apply for a patent." ”

"In that case, the rudder can also be studied, but it's just an all-direction lever. Lin Wencan said thoughtfully.

"You can think about this in your off-hours, and I don't recommend doing research for the time being. Zhang Heng said lightly.

At this time, where is there a game that needs a rudder, it is not too late to take it out after twenty years, besides, the IC devices involved in the rudder are different from the hand stick, and it will take at least ten years before there is a similar functional module, which is still developed because of military needs, Zhang Heng will not put such a poor manpower into this kind of thing that does not have much benefit.

The input part was set to a 4-way hand rod, and the corresponding digital circuit was also done, Uncle Li went back to prepare the tools, and prepared to come over to make mechanical samples, anyway, for testing, it was okay to be coarse, Zhang Heng and a few people began to discuss the output part.

Both PONG arcade and Atari arcade machines used CRT displays until the early 21st century, and at most switched to better-pixel picture tubes.

There was not much choice, Zhang Heng quickly decided to purchase RCA (American Radio Corporation) CRT display as the arcade screen, RCA itself is the largest TV manufacturer in the United States, so it can provide the complete image and pronunciation IC modules required by the arcade.

In this way, as long as the input, output and main core are integrated, Daheng Technology can immediately launch an arcade motherboard that can be mass-produced.

Uncle Li came back and started to make samples of the hand rod, Lin Liang simply stayed and started, the three engineers went out to purchase the required components, and Zhang Heng went back to Xinlong Industrial Building to contact RCA.