Here is the Schematic and PCB Files in current Version.

All Files are GPL v2 Licensed.

Thanks!

EDIT:
Obsolete - All Files are on Github now

Nice project, would be great to find a plastic case just to encase the PCB and contents.

But again, nice work projects like these is what we need.

One could go one step further than finding a case and substitute the DB9 connector for a pin header, and connect that to the internal COM1/2 header using a flat cable. Then you could put the board in a bracket or something. Anyway, very nice Project. Extremely useful for older PCs.

Thats already possible, just use the Pinheaders.

matze79 wrote:

Thats already possible, just use the Pinheaders.

My bad, didn't notice them. Well, flexibility is always nice 😀

This looks really cool. I actually just bought a brand new serial mouse on eBay because I wanted to minimize potential trouble that could stem from purchasing used mice. But it would be nice if I could wire up my ps/2 optical trackball for serial usage as well.

Some Progress:

excellent work!
sent a pm 😀

There was a previous effort to do something like this, but it sorta fizzled out: PS/2 to Serial Mouse protocol converter

This looks awesome.

Would you consider putting your PCB gerber files on OSHPark? They can ship all over the world very cheaply, you only need to order 3 at a time, and they give you a very high quality board with ENIG finishing and such.

Edit: Oh, just noticed the files were attached to an earlier post! Nice!

Edit2: I hope you don't mind, I went over your layout in Eagle and fixed up some of the funny trace angles. It looks like you finished doing your routing, and then moved some components slightly?

Edit3: I also moved around some of the component labels so they don't overlap.

its possible that something isnt 100% perfect, as i just try to teach things myself 😀
i'm currently writing with the original author of the avr source code to license it under gpl, so this will eventually become a Community Supported Project and the Firmware will get some improvment, its also possible to add a bootloader to the avr to allow updating over RS232 directly from Windows or DOS.
But some mouses seem to have Problems with the timeout issued by the bootloader.

Thanks for fixing the Issues within the Files.

i'm currently using dirtypcbs.com which also offers shipping and sending around the world, a minimum order would be 10 pieces Protopack for 25$.
If you like you can add the pcb to oshpark too.
i waiting for the parts to arrive to make a test build with the PCBs, and get eventually some final fixes.

Sorry for wrong grammars 😀

I may sound dumb but, a usb mouse would work on it with an usb to ps2 adapter?

^ only if the mouse in question works with both standards. The usb mouse need to support in hardware the PS2 mode, with the adapter it changes to that and works like a normal ps2 mouse. The adapter does nothing to new usb-only mice...

there is no reason to use a usb mouse at all, ps/2 is still on new mainboards, so you can expect that ps/2 mouses will still there in 2025.

Very nice to see a board like this actually being made. Should at least make some non-ps2 machine users happy.
I had an idea once to just capture the mouse to a window on a machine next to my dos machine and then send the mouse actions from that pc to the dos machine over a serial cable. But I've just stopped using old machines that don't have a ps2 port 😀

keropi wrote:

^ only if the mouse in question works with both standards. The usb mouse need to support in hardware the PS2 mode, with the adapter it changes to that and works like a normal ps2 mouse. The adapter does nothing to new usb-only mice...

This is very correct! My main USB mouse does not talk PS/2 so it does not work on a PS/2 port, and i bought it in 2009.

However, PS/2 compatible mice should be relatively easy to find in the near future.

Build works 😀, no Errors in the PCB Design!

Everything works! I´m Happy!

Why the jumper wires for the regulator and diode?

Not needed, i get 5V directly from my Keyboard Jack on the Laptop.
The Diode would drop some Voltage and Stop the Mouse from Working.
if the 7805 is in Place you need at least ~6.5V Input Power.
For simplicity i choose this solution, i startet working on a second Version with SMD Parts, running with a Switching Regulator.
But this will not allow Beginners to build the Circuit easily. (SMD Soldering needed)

ah excellent, smd version is a step forward 😀