I used a needle to check every single hole on the female ps2 adapter. I used the speaker connector on the motherboard to get a GND pin. This is the situation. It seems to me the opposite of how it should be. Is it correct in your opinion? Thank you!

If the adapter is not wired like this it is useless:

https://lh3.googleusercontent.com/proxy/dQduy … D8ArywYozH1oNnc

Check the mouse on your XT, just to make sure that the adapter and the mouse work. There's a high chance that the mouse doesn't support serial operation, have you considered this case?

The mouse works regularly. I tried it on another PC. I'm not sure though that it supports serial operation, but probably yes. A few years ago, if I'm not mistaken, I used it with a serial adapter. Do you have more detailed information about it? thank you.

When a mouse supports both serial and PS/2 protocols it is typically noted on the sticker, like so:

further read:
PS/2 to Microsoft Serialmouse Adapter Converter / Updated First Post / Firmware Update added

I downloaded the drivers for the genius newscroll mouse. The drivers work correctly on COM1, both on DOS and on Win311. I see the mouse pointer on DOSSHELL and on Win311. But it doesn't move!
I tried to insert a PS2 optical mouse, but the light doesn't turn on. Does this mean it is not powered?

I do not know the exact symptoms of a mismatch.

Do as konc advised - try the mouse + adapter on another system with serial port in order to eliminate possibilities. If that works either the PCChips motherboard's IO or the serial cable is faulty.

Unfortunately I can't do this test, because my XT computer has a 25-pin serial port and I don't have the adapter.

Okay, I tried the adapter on my mother's computer with a COM1 port. This computer has Windows 10. I have connected both the Genius mouse and the optical mouse. On restart they are not recognized by the operating system. I am increasingly convinced that the adapter is broken.

Everything is possible but my first vote would be for the Genius mouse being incompatible with serial port. But there is little harm in buying/trying another adapter. Spare parts are almost a must in this hobby.

I have purchased a "new" microsoft serial mouse. I will update you when I try it. Thanks!

Hello guys! Today I received the microsoft serial mouse which I ordered last week.
It works regularly!! Now I will return the broken serial-ps2 adapter. Thanks everyone for your valuable help!

@Horun

Thanks a lot for the serial pinout! Was so happy to get my P60 Mainboard to run, and then my mouse would not function.

Tried 5 different serial brackets, and with no one my serial mouse was recognized.

Then is soldered the cables like it is seen on your pinot - And now my serial mouse is running fine - Yeah - THX 😀

saved me today!!!!!
thanks!

Horun wrote on 2020-03-14, 23:42:

Ok so there are two standard motherboard pin outs for COM ports, and probably a few proprietary ones. The standard ones are AT/E […]
Show full quote

Ok so there are two standard motherboard pin outs for COM ports, and probably a few proprietary ones. The standard ones are AT/EVEREX type or DTK/INTEL type, the way to check is from pin 5 or pin 9 on the header. If pin 5 is Ground then AT/Everex, if pin 9 is ground then DTK/INTEL. The PcChips m919 v3.4 (or at least my board) has pin 5 as ground just like early Asus and Gigabyte so is AT/Everex. To check your COM port dongle you need to check if pin 5 on the the header connection is connected to pin 5 or pin 3 of DB9.
if connected to pin 5 then it will work with AT/Everex header, if to pin 3 then DTK/Intel header wired. To verify if DTK/Intel type and not proprietary if you discover Pin 5 on header connector is to pin 3 on DB9: check pin 9 on header connector to pin 5 on DB9, it should be 0 ohms. Anything else is proprietary and will need further checking.
Note: Pin 1 on the dongle header connector always goes to Pin 1 on the DB9, no matter which type.

Copy code to clipboard

1RS232 Motherboard header pinout ( AT/EVEREX )
2IDC internal
3 (newer)
4AT/EVEREX Signal Name	Description
5pin number
6
7header pin				cable pin
81 	DCD 	Data Carrier Detect 	1
92 	RXD 	Receive Data 		2
103 	TXD 	Transmit Data 		3
114 	DTR 	Data Terminal Ready 	4
125 	GND 	System Ground 		5
136 	DSR 	Data Set Ready 		6
147 	RTS 	Request to Send 	7
158 	CTS 	Clear to Send 		8
169 	RI 	Ring Indicator 		9
17
18
19RS232 Motherboard header pinout ( DTK/INTEL )
20IDC internal
21(older)
22 
23DTK/INTEL Signal Name Description 	
24pin number
25
26Header pin				cable pin
271 	DCD 	Data Carrier Detect 	1
282 	DSR 	Data Set Ready 		6
293 	RXD 	Receive Data 		2
304 	RTS 	Request to Send 	7
315 	TXD	Transmit Data 		3
326 	CTS	Clear to Send 		8
337 	DTR	Data Terminal Ready 	4
348 	RI	Ring Indicator 		9
359 	GND	System Ground 		5
36
37Pin 10 removed in connector.

EDIT: added extra info and corrected my grammar