I’m trying to add a third PS/2 device but with current Y cable, I’m only limited to have two PS/2 devices.
How can I expand this limitation to have three PS/2 devices without risking Qubes security?
Are there PS/2 cables that can split to more than 2 female ports?
Are there any PCIe cards that can plug in and play with dom0?
As I understand it, almost all PS/2 PCIe cards are wired to USB bridge that lspci in dom0 would pick up as USB controller, which essentially, makes them USB cards disguise as PS/2.
Can anyone testify that this isn’t true and there is a card that actually works with dom0 right away without complication?
There would be always complications. PS/2 port dates back before invention of PCI or USB. There used to be a dedicated chip for it (Intel 8042) with two fixed IRQs for each port. A 3rd port was never a standard.
Do you know if those devices actually present the USB bus on the PS/2 connector ? If the connectors really behave only as PS/2 then would their internal USB bus be safe to attach to Dom0, if you can deny other access to it?
I remember having laptops which had combined usb/ps2 ports, and still I have some adapters for using them… and noticed that some cards have an internal connector for extra USB ports, but I never bought one to know if they have the same problem.
Now I am even wondering about the PS/2 on my motherboards…