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New MB, is it possible to split single PS/2 to KB+mouse? (Users)

posted by RayeR(R) Homepage, CZ, 20.10.2015, 19:38

> To use a Y-splitter, the motherboard hardware/BIOS must be designed
> correctly, and it sounds like on at least some of the modern Gigabyte
> boards (and maybe those from other manufacturers as well) this isn't the
> case. There's probably nothing you can do to fix it. Your most viable
> option is probably to use a USB mouse and a PS2 keyboard.

In case of Frank's MB he reported me that the pinout of combined PS/2 simply use the unused pins to populate mouse PS/2 signals. So his Y-splitter simply wires this pins correctly to female connector for mouse and no problem. In such case there's no need BIOS do anything. But I don't know if there exist some different combined PS/2 pinout. I can imagine it would physically use only 4 pins like normal PS/2 and switch data signals. I would need some MB to probe with DMM or a schematics...

> BTW, it's a similar situation for the PS2-to-USB adapters that are supposed
> to let you plug a USB mouse/keyboard into a PS2 port. Those are simply
> wiring adapters and assume the mouse hardware is capable of understanding
> both PS2 and USB protocols (which are VERY different from each other).
> Such "dual-mode" mice (and sometimes keyboards) were relatively common back
> in the early days of USB when PS2 was just starting to be phased out, but
> not any more. And you can't tell which are which just by looking at them
> -- you need to find the design specs.

Yes, I already use MS intelli explorer USB via this adapter. I never disassembled it so I'm a little bit surprised now. But I remember that I read somewhere, that the adapter works only with MS mices, so this makes sense...

---
DOS gives me freedom to unlimited HW access.

 

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