The Package arrived today, and I assembled the single kit this evening. Without the LM7805 that is, because I want to use it with 5 Volt from the PSU instead. Maybe later I will make a bracket for it and configure an internal RS232 cable.
I am glad to report it works well with this optical PS/2 wheel mouse: "MiNt, Model MSO-03".
For completeness sake: It does not work with "Microsoft Wheel Mouse Optical USB" with PS/2 adapter.
So I can now use a proper mouse on my 486 VLB system. That is amazing! Thank you for making this Matze79.

I wanted to print out something to aid in the assembly, but ended up taking a photo and making another component overview. It is attached.

What is the function of the DIP switch?

Edit: updated graphic a little

Hi gerwin,

the DIP Switch is for future use, it will allow to switch beetween Microsoft and Logitech Mode, and other stuff.
Firmware Update is possible trough bootloader on the mcu. (thats why it needs some time to start, there is delay to wait for update programm to send firmware)
Also thanks to felmar loyd wo makes this possible and wrote a entirly new firmware for the ps2 mouseverter 😀.

Nice Graphic, i wanted to make a webpage with instructions but had no time until now 😒

matze79 wrote:

the DIP Switch is for future use, it will allow to switch beetween Microsoft and Logitech Mode, and other stuff.

Interesting. Though I am currently not knowledgeable about these things, I am looking forward to whatever you and felmar loyd can come up with in the future.

Using Windows 95 it recognizes the setup as a generic serial mouse. It is not that big a deal, but would there be some trick to get Windows 95 to utilize the mouse-wheel movement, for scrolling?

matze79 wrote:

Nice Graphic, i wanted to make a webpage with instructions but had no time until now 😒

No problem. It has to start from somewhere. Your video had some info that I could not find elsewhere, but I put that in the graphic now. ( You can use or change it if you like, of course. )

It is not that big a deal, but woud there be some trick to get Windows 95 to utilize the mouse-wheel movement, for scrolling?

Felmar tried to get it working and its enableable in the firmware (recompile needed), but when ctmouse is loading the keyboard locks up when wheelmouse support is enabled.
And currently no one knows what is wrong here.
So experimental wheelmouse support is not working now.

The Tiny4313 is also in place to support your future space requirements 😀

oerk is working on a case for the Converter 😀

Thanks!!!

😁 i can't await to hold it in my hands.

nice!
have you considered the possibility of making it like the raritan adapter? plugs in both keyboard (for 5v) and serial and has pass through connector for keyboard and ps2 mouseport

matze79 wrote:

oerk is working on a case for the Converter 😀

It's not compact enough yet 😒

New version is printing right now, Matze should have his in a few days.

STL file will be made public when it's finalized.

One of the issues with the raritan adapter is that the unit sticks out about around 2-3", that is, straight out pasted the serial port. It would have been nice if they had a swiven mount for the DB9 at 90 degrees, so that the unit would not protrude so far out the back of the case.

What I think would be neat would be figuring out how to get matze79's adapter working with KVM's which switch a single PS/2 mouse between ports. All the commercial units I've tried have had issues with this.

i tested 3 kvm switches, and all where working fine.
Also the Microsoft Wheelmouse USB works on it with USB Adapter, someone has written it does not but mine is fine.
Also my Logitech USB has dualmode Support and works.

i also don't understand why all those other converters are so expensive, there are ones from 50$ to 300$.
i mean for 300$ you can expect a nice tracking quality..

i now working on miniaturize the device.
use mlf package controller, smaller voltage regulator etc. i'm pretty sure it can be made much smaller,
maybe it will fit soon inside a SubD9 Case.
But i'm not sure if can hand solder MLF 😀

did the package arrive feiopa ?
i have no idea how long it will take oversea.

@matze79, have you though about laying out an SMT version and producing it in China?
Should be very cheap these days.

matze79: The unit arrived yesterday! I won't have time to assemble and test it for some time though. I am in the middle of building a wood shed and garden shed. I am also having issues with the neighbours who have excavated down 1 metre at my fence line, leaving my property susceptible to landslides, erosion, and a falling down fence. And the neighbours do not want to put up a retaining wall, which is insane. This fiasco is consuming all my time.

hopefully the next rainfall will not wash away your fence 😳
those neighbours are boring. 😀

matze79 wrote:

i tested 3 kvm switches, and all where working fine.

Yeah, mine does too.

I found an hour to assemble and test matze79's protocal converter on a 386. With a trackball ps/2 mouse connected directly to the converter, it seems to function normally without noticeable lag at 1024x768 (Win3.11). But when I use the same mouse (Logitech MouseMan M-S38) on my KVM and through matze79's converter, I notice a very irritable lag in tracking quality. Have you noticed any lag issues when using a KVM? My KVM w/audio is an IOGEAR GCS614A MiniView, 4-port. I have three of these KVM's and have used them for about 15 years without much issue.

Asside from the issue with the serial-to-ps/2 conversion, I tend to hear some feedback through the speakers when the mouse is moved and the volume is up quite high.

What KVM w/audio units have been tested and found to be error free with tracking lag? I no longer recall if I tested all those commercial protocal converters with and without KVM. I should retest that. I should also test your converter with a ps/2 laser mouse. I'd also like to test higher resolutions of 1280x1024.

Anyone else test matze79's unit with a KVM?

By the way, component assembly was a breeze. I used a pin header instead of the round power connector. I connect the power pin header directly to the floppy power cable (12V).

I double checked using an optical mouse connected to the KVM and the converter still exhibits the same irritating lag. It is not useable unless you have a lot of patience and don't mind waiting 500 ms for each direction change.

I checked the Raritan converter and the symptoms are the same, that is, with any mouse connected directly to the converter, there is no issue. With any mouse connected to the KVM, there is lag. Does anybody else have a 4-port KVM w/audio which does not have lag issues when using a serial-to-PS/2 mouse protocal converter? I'm wondering if the KVM is down sampling or emitting some signal, like auto sensing hotkey strokes (used to change the ports), which is either confusing the protocal converter, or reducing the effective sample rate.

When adding native PS/2 mouse functionality to 486 boards, I have no issue when using my KVM.

Sounds like some sort of timing problem.
Now it would handy to hookup a osciloscop and look whats going on between converter and kvm.

my kvm switch works well its some cheapo dlink model, need to recheck type.
Do you also have some other kvm switch for testing ?

Does your KVM have audio and 4 ports? If so, could you confirm what the model is?

I think I have a Cybex KVM w/out audio I can try. I only bought it (many years back) because it had built-in PS/2 to serial conversion.

What ports do I probe on the KVM and what am I looking for?

Did a quick test just to see if and how it worked.

- Microsoft intellimouse w/intellieye v 1.0 (first? ever usable MS optical, from 1999/dual ps2/USB)
- using a passive usb->PS2 adapter into the 'PMSAC' * ...
(*: any brand/model name suggestions for this wonder of technology yet? 😎 )
- socket478
- winXP (only)
- desktop 1280x1024 + some games 800x600 and 640x480
- with the naked PMSAC directly connected to the serial port, could not find any extension cable

Seems to be working just fine so far! Assuming it will be the same when eventually connected to an actual non-PS2 machine as well. No apparant delays of any kind. Though the low DPI on this very old mouse is noticeable in the higher resolutions... (not enough settings in the driver for more either)

PS: was expecting the led lights to activate at some point, but nothing happened.
Perhaps these are used for something 'else' ?

------------

So, next I should be looking for a USB->PS2 converter adapter - for using a modern USB only keyboard on a PS2 only machine....

I just received my kit today. It might be couple of weeks before I have time to put it together though.