Chapter 111 Additional Circuits, Flying Wires

The principle of the burner Lin Hong saw clearly, in general, it was much simpler than the schematic diagram of the motherboard of the Apple II computer, Lin Hong quickly established the model of this burner in his mind, and he could even imagine out of thin air how the data flowed boiling and boiling_)

I have to say that human wisdom is infinite, Lin Hong doesn't know who invented this design, although this burner is simple, but the principle is not much different from the reading and storage principle of the computer hard disk, and it can be completely without relying on the computer, you can use a blank EPROM to copy the content of the ready-made chip

"This description, you just need to look at the first half, the second half of the content involved is too complicated, generally only for the designers and engineers of the burner has reference value, we just need to use it, don't care about it at all"

Gu Wei saw that Lin Hong was looking at the second half of the manual, so he reminded him that the content of that part was too complicated for him

He was born in the wilderness, although he can understand some of the more common local circuits, but when it comes to slightly more complex circuits with larger patterns, he is a little blind and can't understand them at all

But this is completely understandable, and this is a common problem of all amateurs, anyway, they are not going to do scientific research, and it is very good to be able to understand the content of the part, and it is usually enough to meet their needs

Just like this burner, he doesn't need to fully understand how it works, he just needs to know what it can be used to accomplish, and the game that the game company comes out of will still crack

Gu Wei didn't expect that in fact, Lin Hong had completely understood this circuit diagram

This is based on his previous solid foundation in electricians and the results after studying Redpiten, and compared to what he has seen before, this circuit diagram is relatively simple

Gu Wei quickly gave out all the data in the 2764 memory chip

He drags the data into a gadget in a certain order

"It's an encapsulation software, just put these packets directly into it, and then separate them into an image file," Gu Wei explained to Lin Hong, "I don't even need to know which of these files is audio and which is an image file, this software can automatically identify them and place them where they should be."

Lin Hong nodded, indicating understanding

"This one, it's an arcade game simulator" Gu Weizhong ran a piece of software, and the content on the screen had changed, showing English

Lin Hong saw the above prompt "Please load the data file"

"The main reason why I switched to Z80 mode was to run this emulator, which can completely emulate the hardware environment of an arcade machine, so as to trick the game program into thinking that it is running on a real arcade machine"

Gu Wei pressed the shortcut key on the keyboard a few times, found the game file image package that had been packaged before, put it in it, and then hit the "enter key" to load, but the display suddenly turned black and he couldn't see anything

"Huh? Loading error?" Gu Wei was slightly stunned, he was very sure of something, but there was a problem

He held down the shortcut key to exit the emulator program

Then I found a ready-made image package of other game files on the disk, put it in the emulator and ran it, and the result was that the game screen soon appeared on the monitor.

"There is no problem with the simulator," Gu Wei said to himself, "Could it be that the data files are incomplete?" ”

Then he checked the original gaming motherboard for a long time, and finally found another eprom, model number 27C320

Seeing this IC memory, Gu Wei suddenly said: "I X"

Lin Hong: "What's wrong?" ”

"His uncle, there's still a memory here" Gu Wei burst into a foul mouth

Lin Hong felt very strange, there is another one, can you continue-the latest chapter of the Demon Quest-?

"It seems that I had bad luck today, I didn't expect that there is a 27c320 in this arcade, I estimate that the image data is stored in this" Gu Wei explained, "The capacity of this chip is relatively large, reaching 32 megabits, and my programmer can't read such a large EPROM at all"

After he said this, Lin Hong also remembered that the addressable space of his burner was at most eight megabits, which could not reach such a large capacity

The full name of EPROM is "erasable programmable read-only memory", which is a memory chip that will not lose data after power failure, its principle is similar to that of disk, but there are differences, generally composed of floating-gate transistors, which can be programmed by electronic devices with higher voltage than commonly used voltage in electronic circuits Once the programming is completed, EPROM can only be erased by strong ultraviolet irradiation through the transparent window of the silicon wafer that can be seen on the top of the package, it is easy to identify EPROM, and this window is also used for ultraviolet erasure

Eprom is divided into sizes, just like drawers, some of which are large and hold a lot of things, while others are smaller and can only hold a little bit

2764 is a kind of "small drawer", only 64k bits in size, because it is very cheap, so it is used more, generally in large quantities

The 27C320 is a "big drawer", with a capacity of 32M bits, which is much larger than the capacity of the 2764, and this kind of EPROM is actually very rare, and it stands to reason that there was no such EPROM when this game appeared

"Damn, it looks like this board itself is a modified board"

Gu Wei finally found that he saw that there were traces of resoldering around this chip, that is to say, this board had been modified by someone, and what made him feel strange was that these traces seemed to have been carefully treated, and ordinary people couldn't see it at all, if he hadn't had a preconceived consciousness in the first place, and he himself had the intention of looking for traces, he wouldn't have seen it at all, which was why he hadn't seen it before

Gu Wei felt very strange, it was really incomprehensible that this chip appeared on this board

Lin Hong asked casually, "Where did you get this board?" ”

"One of my fellow from the Northeast brought it over, he does all kinds of business, you know, he often goes to the Soviet Union to resell things, many of my boards are from his hands, Lao Maozi's side is now very cheap, he casually used some daily necessities to exchange for a lot of such things, in fact, these things, to put it bluntly, are some foreign garbage, imported from abroad by Lao Maozi, this board has been some years......"

Lin Hong nodded slightly: "In other words, this board may have been reworked by Lao Maozi?" ”

"Yes" Gu Wei was a little helpless, "Such a large memory chip, I can't read it at all in this recorder, it's a pity, I don't know what good things are in it, I am willing to use a 27C320, as far as I know, "Saloman Snake" is not able to use such a chip Lao Maozi's technology is also very powerful, there must be something special in it"

Gu Wei regretted in his heart, he wanted to give out the data in this chip very much at the moment, but there was no corresponding equipment, it was really difficult for a clever woman to cook without rice, and she was depressed

"As far as I know, it is difficult to find a burner that supports large volumes in a short period of time in the entire Zhongguancun market, and it is estimated that it will have to be temporarily mail-ordered from Guangzhou, so I have no choice but to look back" Gu Wei intends to give up

"Perhaps...... I have a way to get the data out of it," Lin Hong said suddenly after being silent for a long time

"Do you have a way?" Gu Wei suddenly looked at him with wide eyes, "What can you do?" ”

Although he didn't think so, out of politeness, he still asked

Knowing that there is no large-capacity burner (the latest chapter of Seeking Demons), a rookie who has just come into contact with this industry actually said that he has a way to give out the data in 27c320, which not only makes him feel a little funny, he has been in this industry for so many years, and he is helpless, let alone him Gu Wei believes that even if his master is here, there is no way

"I just took a look at the circuit diagram of this burner, and I think that because it pursues stability too much, it sacrifices a lot of efficiency, which limits its addressing space, and many of the circuits in it are actually redundant, and you can use a clever way to streamline it."

Lin Hong took out the burner's manual, opened the page of the circuit diagram, and continued: "Actually, you can add an additional circuit here, and then fly a wire from here and here, so that the remaining large circuit can be completely streamlined, and through this additional circuit, the addressing space of the burner can be increased by four times, that is, 32 megabits."

As he spoke, Lin Hong drew a line on the schematic diagram of the burner with his fingernails

Gu Wei looked at Lin Hong with a surprised expression, his eyes seemed to see an alien

"Don't tell me you fully understand this schematic?"

"I guess I understand"

"I X"

"Damn!"

"Damn!"

Gu Wei "leaned" three times to express his mood at the moment

What Lin Hong said seemed to be well-founded, and he believed half of it, although he wanted to believe it all, but this thing was too exaggerated for him to accept at all

Gu Wei hurriedly found a pen and paper and asked Lin Hong to draw the additional circuit he said

Lin Hong was not polite, picked up the pen and brushed it on the white paper a few times to draw a fairly simple circuit

From the level of drawing circuits, Gu Wei knew that Lin Hong was an expert, not only the representative symbols of various electronic components fully met the national standards, but also the lines drawn casually were a little straighter than what he drew with a ruler

"Professional, his uncle's is simply too professional"

When Gu Wei saw his circuit diagram, he actually felt ashamed of himself, just like a pirated version met a genuine version

"This circuit is to add two additional bits to the burner, which can represent the four states of 0, 1, 2, and 3 respectively, so that there are four 8 trillion spaces available...... The flying line is connected to these two points, of course, the flying line can be used or not, but the flying line can be used to speed up the degree, according to my calculations, it should be able to increase the degree by about two times"

Chapter 111 Additional Circuits, Flying Wires

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