Chapter 756 People who copied homework
In fact, this model they have is called DJS-60E internally.

At first glance, you might think this thing is an evolved version of the D type, but in fact it is not. E does not mean the developed version of D, it means the export version.

For the export version, of course, it must be reinforced to avoid damage during long-distance transportation.

What appeared in front of Professor Drinker was a lump of black glue. No one knew what it was, but it filled the box completely without any gaps.

"These Orientals actually filled vinyl records! Damn vinyl records, I hate vinyl records!"

He complained loudly and spit out foul language.

As an expert in this field, Drinker knows very well that this kind of black glue is most likely a thermosetting epoxy resin. Once it solidifies, it will be very troublesome to remove it.

It can be removed by physical means, but this thing is very stubborn and it is easy to bring the chip with it during the removal process and cause problems.

Those who put black glue on the chip are not good people! Drinker cursed fiercely in his heart!

It is protection in name, but in reality it is more than that. For machines or accessories working in non-harsh environments, the protective effect of glue filling is actually overflowing.

On the contrary, there is a problem that, after filling the vinyl, for ordinary people, this thing has a high probability of becoming disposable, and it is very difficult to repair if there is a problem. Simply put, it will break as soon as it is disassembled. This is not uncommon even after decades.

Not to mention ordinary people, even professional repairmen would have a headache using this thing.

"John! John! Get an angle grinder!"

At this moment, Drinker felt extremely aggrieved. When will people like us who work with high-tech such as computers be able to use this thing?

But no matter what, this thing still works. Amid the harsh noise, the edges of the DJS-60E's shell were erased and the shell was completely disassembled.

All that's left is a block of plastic with some cables sticking out of it. The people who made the DJS-60E obviously had no intention of repairing this thing, and these cables are not even connected through the interface, but are directly embedded in the plastic.

Orientals are really inexperienced in computers, so immature! Drinker despised them in his heart.

1274: Is there a possibility that I did it on purpose?
Under Drink's command, the upper surface of the black rubber block was slowly worn away, and the thickness of the rubber block was gradually becoming thinner.

It was probably about time, so Drinker asked John to stop. He took the angle grinder himself and began to grind it down bit by bit very carefully. He seemed quite skilled.

After each layer was removed, Drinker would carefully wipe it with a dry rag before moving on.

Finally, as if he felt something different in the touch, a look of joy appeared on his face. Then he put down the angle grinder and carefully polished it with tools such as fine sandpaper and files.

On the surface of the rubber block, some square-shaped objects can be vaguely seen.

Drinker worked carefully, and then...

"WTF! SOB!" he cursed in frustration.

Smith quickly calmed his emotions: "Drink, don't worry, we always have a way, right?"

He stretched his head to take a look at the rubber block and almost blurted out "SOB". The chip was indeed polished out, but there was nothing on it. All the information on the chip was deliberately polished clean.

Even Smith, who is not a technical person, can see it, because the direction of the grinding marks on the top of the chip is almost perpendicular to the grinding direction of Drinker just now.

At this time, Drinker calmed down.

"John, you and your colleagues should slowly polish out these circuits. After drawing the circuit diagram, try to dismantle and test them. I believe most of these chips should be digital circuit chips. We will always be able to figure out their functions."

Seeing his condition, Smith finally put his mind at ease. If there was something wrong with his mental state, then all his money would be gone.

Half a day later, Delink had to admit that the Orientals did a very thorough job. They erased the labels on all the few capacitors and resistors they used. They didn't even use color ring resistors, but instead used a unified red resistor.

Although this is theoretically not difficult for Drinker, it also means that he has to remove these components to obtain their parameters at some point. The test results of discrete components in and out of the circuit may be completely different.

"They can only do these little tricks, but this can't stop me from copying the machine. It won't even cause me any trouble because I'm not doing these tedious things myself!" Drinker complained to Smith, while trying his best to show that he was not affected.

No matter how confident he was, the fact was that two days later, Professor Drinker's defense was breached again.

Because he found a problem. About 70% of the chips can be determined by testing the state cycle and truth table. The most common ones, such as the four-two input NAND gate, are very simple and can be tested quickly. But for the remaining 30%, no matter which digital logic circuit he used to test, he could not get an answer. They seemed to be brand new!

This made Drinker realize the seriousness of the matter. For some of the things, apart from being able to determine the power supply and ground, he had no idea at all about the relationship between the input and output.

This part of the chip was actually specially modified by Gao Zhendong based on the DJS-60D.

There are two reasons for the modification. One is that in the SZ61 series of chips, some of our unique chips are more beneficial for building computers, such as triggers, which can greatly reduce the number of chips required. These were not included in the chips originally obtained from outside. Since we have spent so much effort to develop the SZ61 series, how can we be worthy of the hard work of ourselves and our comrades if we do not make good use of them.

The second reason is to cheat people, and I will say it without any disguise. Because these chips are not available abroad, it will greatly delay the time for outsiders to copy the DJS-60E. This makes the DJS-60E a very wonderful superposition state for outsiders, which seems to be very promising and makes people reluctant to give up, but at some key points, it is very troublesome and takes a lot of time.

Films like the one that Professor Drinker had no clue about at all were typical rip-offs, because that thing needed to input a pulse at the CP pin to find the input-output relationship. Of course, nothing could be seen without a pulse.

With this feeling of hope mixed with disappointment, despair and hope, Professor Drinker devoted himself to the copying of DJS-60E. He believed that he could copy it, but he just needed some support.

"Smith, I need a few things."

"No problem, my friend, just make your request." For Smith, the fact that Drinker was able to make the request made him very happy. This proved that Drinker was not at the end of his rope and he still had a way out!

Sometimes, finding the right way to spend money is much more difficult and more important than simply saving money.

Read the error-free version at 69shuba! 6=9+shu_ba is the first to publish this novel.

"I need grinding and polishing equipment that can be finely controlled, as well as a microscope with a relatively high magnification."

If it doesn't work, you'll have to grind open the chip and look at the circuit.

For integrated circuits, the circuit can really be seen on the chip, especially for early integrated circuits like this, it’s no joke.

It is just like using a magnifying glass to copy data from a CD. In principle, there is no big problem. The data on the CD can really be read using a microscope. The only problem is that this method is very tiring for the eyes and brain.

After all, Professor Drinker was a real expert in this field. He quickly found a way out and at least he was not helpless.

Similar things happened not only among the Americans, but also among the Russians.

The difference between the Citigroup and the Russians is that the Citigroup's behavior is private, while the Russians' behavior has a bit of a national action. At least their government research institutions are responsible for similar things.

Comrades Vitali and Anatoly, who had experience in copying DJS-59, were still given the task of copying the DJS-60 series computers.

They got the DJS-60 series computers earlier, made faster progress, and realized the seriousness of the matter earlier.

Anatoly held a mid-term test report in his hand with a frown on his face.

"Vitaly, I think we have some bad news."

"Comrade Anatoly, what did you find?"

"Vitaly, most of the chips on their computers are universal. In addition to the Southern comrades supplying us, even the Citigroup people are supplying them on a large scale."

"This is a good thing. Don't put all your eggs in one basket. Even if it's your own basket."

"But, what I want to say is, Vitali, we have tested the input-output relationship and truth table of the remaining small part, which cannot be found on the market. Among all the integrated circuits sold publicly, there is no similar one. This should be their own unique chip."

This is not good news for Vitali, but he has a solution.

"If the quantity is not large, we can use transistors to build circuits with similar functions. The working speed of these circuits is not very high, so we don't need to consider too many problems. As long as the electrical parameters of the input and output interfaces match well, I think it will work normally."

They are even worse off than the Citigroup guys. They have no integrated circuit production capabilities at all. They only have a small amount of board-level circuits to replace integrated circuits, which is a barely feasible approach.

Anatoly shook his head. "This will increase the complexity of the entire system and also weaken the biggest advantage of this computer in terms of physical volume. But this is not the most serious thing. The most serious thing is that we can't test any results for some of the chips."

Vitali had the same idea as Drinker: "Davari, I think it's time to use the microscope."

There are ten thousand ways to cheat, but the methods of copying homework are all similar.

(End of this chapter)