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BaoShuo GMT-20 review and disassembly of the ancient mouse

BaoShuo GMT-20 review and disassembly of the ancient mouse

 

- Original in Russian language

 

An ancient antique mouse from an unknown Chinese manufacturer ... Not only is it a ball mouse, it also has an RS232 connection interface - it is also a COM port. And there is no scroll wheel on it - scroll! Current generations cannot even imagine this. For them, this is something terrible, and the inscription MADE IN CHINA ...

 

We pay tribute to History, in terms of its IT development, and describe this mouse.

 

BaoShuo GMT-20 ancient ball mouse, description

 

The mouse case is large by today's standards: 118 mm long, 60 mm wide and 35 mm high. Regarding the weight, it’s usual, except that due to the ball it’s a bit heavier than the current office rodents. On the upper part there are only two governing bodies - LMC and RMB. Then an unknown logo with a strange name - BaoShuo ...

 

BaoSuo GMT-20 review of the old mouse, with a ball and COM port

 

Turn the device over and look. There are four legs glued on the bottom, a warranty sticker - from it we will find out that the mouse was sold in 2002. Almost in the center of the ball, closed as usual with a removable flange. Label.

 

VALID BaoShuo GMT-20 old mouse with a ball, review

 

On it in capital letters - VALID (what this means, I do not know). The name of the model, or as here is the part namber - GMT-20. Then some inscriptions, badges, and other nonsense that no one needed. Well, who needs to know the nutritional requirements of the mouse? Made in China.

 

A4Tech 2D OK-720 review ball mouse COM

 

However, it is easy to notice that this label is pasted on top of another ... On it are almost all Chinese characters, the logo in the form of a cup ... the name is 2D OK-720, and most importantly - the manufacturer’s website, a very familiar name! a4tech - that's who made this mouse!

 

BaoShuo GMT-20 how to work with a ball mouse

 

By the way, if you turn the plastic flange, you can remove the ball. This was done for preventive cleaning - the internal elements were quickly contaminated, the mouse did not work well, it was necessary to regularly clean both the ball and the internal elements (with a cotton swab with alcohol). The ball itself is heavy - probably steel, rubber coated on the outside.

 

BaoShuo GMT-20 mouse with COM or RS-232 connector

 

Connection cable, it is made clearly and efficiently. The length is 1 meter 30 cm. At the end, there’s such a thing - an RS232 connector, popularly known as a COM port. And the connector is called - DB9F. Once a pair of such connectors and the odious LPT played the same role as on modern USB computers. Various external devices and peripherals were connected to them ... Even now, there is one COM port on the motherboard, I don’t know why.

 

Dismantling the BaoShuo GMT-20 mouse

 

Disassembly is simple - you need to unscrew one screw on the underside, it is usually sealed with a warranty sticker. The upper part is removable.

 

BaoShuo GMT-20 dismantling an ancient mouse, without scroll

 

From the inside, the upper part of the case is not interesting - just a plastic cast with an insert for the left and right buttons.

 

BaoShuo GMT-20 dismantling an old mouse

 

The bottom is more interesting. Here is the electronics board. Then two guides and a pressure roller with a spring - so that the ball "does not walk" ...

 

BaoShuo GMT-20 mouse device with a ball

 

The guides are two plastic axes with which the ball contacts, on the edge of the axis there is a kind of gear - this is the encoder disk, it interacts with the optocoupler. So, this is a mouse with an optical encoder - the slots on the disk are located between the LED and two infrared photodiodes. The ball rotates the guide and the disk. Either a slot or a tooth constantly passes through the optocoupler, this blinking forms a signal from the optocoupler.

 

Mouse electronics board

 

TP8370FP old mouse BaoShuo GMT-20 SUNG WEI NW23RS

 

We take out the entire electronic filling - this is one board of a one-sided PCB. The main element is the TP8370FP chip with the TOPRO logo. I did not find documentation for it, it is most likely a chip that converts and amplifies signals, making them understandable for PCs. Interestingly, these mice have long been gone, and China still sells these microcircuits, at 10 cents apiece ... Next to the microcircuit is a quartz resonator and two regular micro buttons - mouse controls. And here are two Ottopairs, each an LED, and a little black, dual photodiode. On the board marking: SUNG WEI NW23RS 1999-11-12. We see that many radio components are missing here - the one who made the mouse was extremely economical ...

 

BaoShuo GMT-20 diagram of an old mouse with a ball and COM interface

 

On the reverse side, there is nothing. Tracks ... here I have already removed the wires. But who cares, I explain: the upper right corner, four wires, from left to right - blue, green, red, white.

 

I could not check this mouse at work; there is no COM port on my computer. However, the exact same mouse, with the name BaoShuo, I had in 2001. Then ball mice were the norm, but there were already mice with the PS / 2 interface - rarely, there were USB ports, but then no one thought of connecting a mouse or keyboard to them ...

 

The review and disassembly of the BaoShuo GMT-20 is now over. A4Tech also produced OEM products for all unknown brands and brands. There is no nostalgia.

 

 

Mikhail Dmitrienko, specially for WASP.kz

2020

 

宝硕GMT-20鼠标的拆解与拆卸

 

来自未知中国制造商的古老古董鼠标。它不仅是球形鼠标,还具有RS232连接接口-也是COM端口。而且上面没有滚轮-滚动!当代人甚至无法想象这一点。对于他们来说,这是一件可怕的事情,而题词“中国制造” ...

 

我们在历史上的IT开发方面向历史致敬,并描述了这种鼠标。

 

按照今天的标准,鼠标盒很大​​:长118毫米,宽60毫米,高35毫米。关于重量,这很平常,只是由于球的原因,它比目前的办公室啮齿动物要重一些。上部只有两个理事机构-LMC和RMB。然后是一个名字不明的不知名徽标-BaoShuo ...

 

将设备翻转过来看。底部有四个腿,上面贴有保修标签-从中我们可以发现鼠标是2002年出售的。球几乎位于球的中心,照常用可拆卸的法兰关闭。标签。

 

用大写字母标明-有效(这是什么意思,我不知道)。型号名称,或此处为零件编号-GMT-20。然后是一些不需要的题字,徽章和其他废话。那么,谁需要知道小鼠的营养需求?中国制造。

 

但是,很容易注意到此标签粘贴在另一个标签上...上面几乎是所有汉字,杯子形式的徽标...名称是2D OK-720,最重要的是-制造商的网站,一个非常熟悉的名称! a4tech-这就是制造这款鼠标的人!

 

顺便说一句,如果您旋转塑料法兰,则可以卸下球。这样做是为了进行预防性清洁-内部元素很快被污染,鼠标无法正常工作,有必要定期清洁球和内部元素(用酒精棉签)。球本身很重-可能是钢,外面涂有橡胶。

 

连接电缆,清晰有效。长度为1米30厘米,最后有一个东西-RS232连接器,通常称为COM端口。连接器称为-DB9F。曾经有一对这样的连接器和令人讨厌的LPT发挥了与现代USB计算机相同的作用。各种外部设备和外围设备都已连接到它们。即使到现在,主板上只有一个COM端口,我也不知道为什么。

 

拆卸很简单-您需要拧下下面的一颗螺丝,通常用保修标签密封。上部是可移动的。

 

从内部看,箱子的上部并不有趣-只是一个塑料铸件,带有用于左右按钮的插入物。

 

底部更有趣。这是电子板。然后两个导向器和一个带弹簧的压力辊-从而使球“不走动” ...

 

导轨是两个与塑料球接触的塑料轴,在轴的边缘有一种齿轮-这是编码器盘,它与光耦合器相互作用。因此,这是带有光学编码器的鼠标-磁盘上的插槽位于LED和两个红外光电二极管之间。球使导向器和圆盘旋转。槽或齿不断穿过光耦合器,该闪烁会形成来自光耦合器的信号。

 

鼠标电子板

 

我们取出整个电子填充物-这是单面PCB的一块板。主要元素是带有TOPRO徽标的TP8370FP芯片。我没有找到有关它的文档,它很可能是一种芯片,可以转换和放大信号,使PC可以理解它们。有趣的是,这些鼠标早已不复存在,而中国仍然以每只10美分的价格出售这些微电路。微电路旁边是石英谐振器和两个常规的微按钮-鼠标控件。这是两对耳对,每对都是一个LED,还有一个黑色的双光电二极管。板上标记:SUNG WEI NW23RS 1999-11-12。我们看到这里缺少许多无线电组件-制造鼠标的那套非常经济...

 

相反,没有任何东西。轨道...在这里,我已经去除了电线。但是谁在乎,我解释一下:右上角,从左到右的四根线-蓝色,绿色,红色,白色。

 

我无法在工作中检查此鼠标;我的计算机上没有COM端口。但是,我在2001年使用的是与鲍硕完全相同的鼠标。当时,球形鼠标已成为常态,但是已经有带有PS / 2接口的鼠标-很少有USB端口,但是没有人想到将鼠标或键盘连接到它们上。

 

宝硕GMT-20的审查和拆卸工作已经结束。 A4Tech还为所有未知品牌和品牌生产OEM产品。没有怀旧之情。

 

Mikhail Dmitrienko,专门为WASP.kz

2020年

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