I asked about this very problem recently.
While PS/2 to AT (Mini-DIN to DIN) for keyboards is a straight passthrough, and should always work, PS/2 to serial is no such thing. These adapters were proprietary for the individual model of mouse, and the mouse had to support serial mode in order for it to work. So either the mouse doesn't support it, or it's not the correct adapter.

Some mice were PS/2 only and others were PS/2 and serial supported, such as the Kensington Mouse-in-a-box or certain Microsoft IntelliEye PS/2 mouse that also supports the serial port. I have a 3-button mouse that supports both PS/2 and Serial by a flip of the switch (the PS/2 to Serial adapter wasn't working), a 3-button mouse that connects to the serial port, a 2-button mouse that supports serial and PS/2, and 2 IntelliEye scrolling mice that supports both PS/2 and Serial. Sometimes, the PS/2 to Serial adapter stops working after so many years. I had an IBM PS/2 mouse from the late 1980's early 1990's that stopped working on me and the PS/2 to Serial adapter wasn't working.

Check the system's voltage on the power supply to make sure it gets -12VDC, -5VDC, +5VDC, and +12VDC.

LunarG wrote:

I asked about this very problem recently.
While PS/2 to AT (Mini-DIN to DIN) for keyboards is a straight passthrough, and should always work, PS/2 to serial is no such thing. These adapters were proprietary for the individual model of mouse, and the mouse had to support serial mode in order for it to work. So either the mouse doesn't support it, or it's not the correct adapter.

well how about this mouse: IBM 96f9275 im struggling to find any info and its outside of my computer realm.
but i thought because its ibm and its from the era as this computer it would work.

so i dont know what should i do now. i tested the mouse on my main pc that has ps2 and it works.
for example how to find out if the 486 is detecting that a mouse is plugged or something.
i need more help with this.

As far as I can find out, that mouse is manufactured by Logitech (no big surprise there). It probably just doesn't support being used with an adapter. Best bet is to get a classic MS Intellimouse.

LunarG wrote:

As far as I can find out, that mouse is manufactured by Logitech (no big surprise there). It probably just doesn't support being used with an adapter. Best bet is to get a classic MS Intellimouse.

so is it impossible for this mouse to work with serial port?
not even with device like this?
https://trolsoft.ru/en/sch/mouse-ps2-to-serial

Im looking for any option that would enable me to use this mouse. i love how it looks and feels.

It should work with one of those.

ive sent an email to that guy. but not sure if its possible to buy it assembled. i dont have any tools or skills to do it myself.