Simple USB Keyboard/Mouse adapter for retro PCs // Your trustable pcb prototype partner : https://www.pcbway.com/

Order a HIDman from PCBway here https://www.pcbway.com/project/sharep...
Front Plate https://www.pcbway.com/project/sharep...
Rear Plate https://www.pcbway.com/project/sharep...

And grab the case from here : https://lincolnbinns.com/ecaseabla...
Don't forget 8x screws : https://lincolnbinns.com/ecasescrew... (I suggest the thread former ones)

You can find PS/2 cables, adapters etc on ebay and aliexpress.

Dubesinhower's stream showing the build process :    • Easily Convert USB Mice and Keyboards...  

Other people's projects :
USB4VC https://github.com/dekuNukem/USB4VC
ps2x2pico https://github.com/No0ne/ps2x2pico
usbtops2gameporthat https://github.com/ChrisDeadman/usbt...

Blender file of the 1000W solid gold RGB keyboard https://drive.google.com/file/d/1nR8...

I might have a few for sale here : https://www.tindie.com/products/raste...