,
Then he said, "If each switch is a proposition, with the switch being closed as 'true' and the switch being open as 'false', and the light bulb is also a proposition, with being on as 'true' and off as 'false', then the two switches What is the relationship between the proposition represented and the proposition represented by the light bulb?”
"When only two sub-propositions are true at the same time, the compound proposition is true. This is an 'and' relationship." Feng Shan answered.
"Yuzhi, what kind of circuit is this? I told you about it last time."
Qian Yuzhi scratched his head and replied: "Series circuit."
"Okay, now you modify this circuit and ask that 'when any switch is closed, the light bulb will light up'." Von Nuo continued.
Qian Yuzhi thought for a moment, removed the two switches from the circuit, then connected the two ends of the two switches with wires, and then connected them to the circuit of the light bulb and battery. Then he took the initiative and said: "Two switches connected in parallel can achieve this effect."
"These two switches are in an 'or' relationship!" Li Janai also rushed to say.
"So, what will happen if we add a reading hole touch roller to each card reading unit of the sorting machine and connect it in series with the original touch roller?" Feng Nuo asked again. He glanced at Feng Shan and signaled to her Don't answer.
"Only when the two contact rollers are perforated, which is equivalent to two series switches being closed and energized, will the relay work and push the card into the card pocket." Qian Yuzhi replied.
"What is its logical meaning?" Feng Nuo looked at Li Janai again.
"This card satisfies the 'AND' of the two simple propositions represented by the two touch rollers." Li Ganai replied.
"That's it! Then if you add a few more contact rollers to each card reading unit and connect them in parallel, you can control the relay to push out the card with any one of the holes. This is equivalent to one of the simple propositions represented by multiple holes. It's 'or'!" Qian Yuzhi said happily as if he had also discovered a new world.
"That's it. We will modify it like this tomorrow. Each card reading unit will be equipped with 10 contact rollers and connected in series." Feng Nuo was very satisfied. Qian Yuzhi seemed to have learned a lot recently.
In this way, as long as the question to be queried can be expressed in a disjunctive paradigm with "no more than 10 conjunctive terms, and no more than 10 simple propositions within each conjunctive term", the classification machine can handle it, and its functions will be better than Much stronger now.
He looked at his watch and saw it was almost dinner time.
"The last thing I want to say is that this type of function of the classification machine is actually very closely related to 0-1 Boolean algebra. 'AND' and 'OR' are actually operations. We call them 'logical operations', which are the most advanced functions of computers. One of the core functions.”
"We can see that the logic operations 'AND' and 'OR' have an equivalent relationship with the series and parallel connection of the circuit; the switch may be closed or opened, the relay may be powered on or off, and the light bulb may be on or off. These Both states of the component can be used to represent 'true', 'false' or '0', '1'. In the future, there will be other electronic components that can do a better job."
"So, it is very convenient to use electronic circuits to perform logical operations. Moreover, electronic circuits are much faster than mechanical structures and will be the future development direction of computers."
"Then, here comes the question. All of the above are logical operations. But the computer system does not only need to do logical operations, but also ordinary addition, subtraction, multiplication, division, exponentiation, and even calculus, etc. These operations, we call them It is called 'arithmetic operation'. The tabulating machine in the computer system is actually a device used to perform arithmetic operations. Now we can use mechanical structures to complete the accumulation function. But what if I want to use electronic circuits to perform arithmetic operations? What to do? The switch can indicate true or false, but it cannot indicate a specific number."
Feng Nuo's eyes swept across the three students below, and when he saw their expectant eyes, a bright smile appeared on his lips. He turned around and wrote a line at the top of the blackboard.
"There are 10 kinds of people in the world, one understands binary and the other does not."
A few days later, the conference hall of the machinery factory was filled with people. This is where the industrial office holds regular meetings, and the Planning Institute organized a seminar on punch card computer systems here—actually a briefing. The purpose is to introduce the functions of this system to the ministries and departments under the Government Affairs Council, so that each unit can go back to study and propose specific application requirements before considering procurement plans.
The Senate has an urgent need for data collection, management and application, so as soon as the meeting notice came out, including the Planning Institute itself, the departments of land, civil affairs, finance, taxation, auditing, police, finance, political security and Fubo Army Many elders and senior officials of naturalized citizens attended the briefing.
Although Ma Qianzhu was the main leader in promoting this project, he did not attend and only sent a congratulatory letter. The meeting style of the Senate was very concise. Wu De, who presided over the briefing, only briefly introduced the background and progress of the project for one minute before letting Feng Nuo come on stage to explain the entire system and answer questions.
Feng Nuo had mixed feelings at this moment, and his eyes were a little sore. Different from the "fishing" I originally envisioned, I have crossed over n majors, and the machine I built with my own hands feels like my own child.
Punch card computer systems were not produced or copied in China in the old days, and there were very few Chinese materials. There are only a few manufacturers abroad such as IBM, and the users are often large enterprises and government agencies, and not much information is spread. Its principles and designs are scattered in various documents, and in fact there is no complete information that can be copied or imitated.
In order to design this system, the project team searched almost all electronic materials in the Great Library and found out all the materials related to this primitive computer, even just a few words, and then reorganized and combined them into a reference The brochure has the same height.
The current set of prototypes was created by him and many senior members of the project team who spent many nights and nights studying, discussing, arguing, designing, manufacturing, verifying, revising, re-verifying, and revising... The design of the mechanical structure and many key components came from other veterans of the research team, but as the main planner, Feng Nuo's excitement was indescribable.
Although this child's "IQ" is not very high, and his appearance is silly, big, black and thick, at least it can really start working. In the next step, he will further improve it to make it smarter and run faster - of course, this also depends on the technological progress of the industrial port.
He knew very well that the mechanical punched card computer was only a transitional product, but this product was the beginning of more advanced tube and transistor computers in the future. With this simple system, the computer system of the Senate could train the first batch of Professional computer technician. They will inevitably become the pioneers and users of more advanced computers in the future.
Thinking of this, Feng Nuo's heart surged and he almost shed tears.
He calmed down, walked to the speaker's seat, and began to introduce the functions and performance parameters of each component of the punch card computer system one by one...
In the back row of the venue, Li Janai quietly walked out, and it was time for regular contact again.
She felt a little weird. Jia Ben was obviously not far away from the construction site, but he had to go to a specific contact point every time to contact him. "It would be strange to have to be like this all the time." She thought secretly, not noticing that it was strange for the "organization" to arrange two "hidden cadres" in such a small area.
"You have done a good job this year, keep working hard." This was Jia Ben's first sentence after meeting.
After saying that, he smiled. Li Janai didn't know that Jia Ben could also laugh. But his expression immediately returned to seriousness and he added, "These are not my words, these are what the regional commander comrade entrusted me to convey to you."
"Yes! Thank you for the organization's encouragement and trust!" Li Janai quickly stood at attention and saluted.
Jia Ben waved his hand, signaling her to relax. "In a few days, another comrade will contact you," he said casually, "Now that you are here, I will probably be transferred away soon. You should pay more attention to the machinery factory in the future. It doesn't take much from me." explain."
He did not mention that he might be transferred to Guangdong, and the Senate was preparing a metal processing enterprise in Foshan; nor did he mention that Li Janai had done a good job in punch card machines during this period, and the superiors might consider transferring her to work part-time in the technical department—— The elders of the Political Security Bureau had an urgent need to establish a detailed and fast filing system, which was famously used in concentration camps back then.
"Do you have any other questions?"
At this time, Li Janai was uncharacteristically embarrassed and took out a document and handed it over, "What is it again?" Jia Ben asked as he took it.
"Love application?" Jia Ben was stunned for a moment when he saw the words above, and then he laughed again - this time he laughed for much longer than before, as if he had seen something particularly interesting. He glanced at Li Janai. The girl's face was slightly hot, but she was looking at him seriously.
According to the regulations of the Political Security Bureau, "hidden officials" like Li Ganai are required to perform the "important personal affairs reporting" system. Love is also considered an "important personal matter."
Jia Ben put away his smile, but there was still a trace of smile on his face, "Are you serious? I don't encourage you to hand this in - you are still young, and now you are the chief's student, and you have a bright future."
Li Janai's face turned redder, but she still didn't answer and looked at Jia Ben stubbornly.
Jia Ben was a little helpless. He put the envelope into his pocket and said, "Okay, according to the regulations, you have this right. However, you have to know that according to your status, even if Qian Yuzhi is a martyr, the political rating It’s quite high, and it will take a long time to get the application approved.”
"Thank you." Li Janai's voice was as thin as a mosquito, "It's okay, I'm willing to wait."
－－－－－－－－－－－－－－－－－－－－－－－－
Next update: Volume 7 - Guangdong and Guangxi Strategy Chapter 62
