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

posted by RayeR Homepage, CZ, 19.10.2015, 17:57

Hi,
this is pure HW question but may be interesting for other DOS users. I assume that you, like me prefer native PS/2 connection for KB+mouse because of buggy BIOS USB legacy support. Now I'm going to upgrade to LGA1155 platform where I want to have DOS installation too. The problem is that most of MBs have only single PS/2 connector that is mentioned to use KB OR Mouse but not both. Some users reported that thery tried Y-split adapter working on older MB but it doesn't work on newer (tested on Gigabyte MB).
My question is that it can be splitted by differently wired adapter or if it requires some HW mod to MB?
I looked that SuperIO chip on MB have 2 separate PS/2 lines for KB and mouse. So I guess there's some "intelligent" switch circuit that route one or other line from superIO to PS/2 port. It have to probe what is plugged in and then switch right way - how does it? I think it would be possible to blow off this circuit and tap directly to super IO but I'm afraid if BIOS wouldn't interfere some way (it's autodetection routine). Did somebody solved this problem?
Unfortunatelly LGA1155 MBs vanished from PC-shops so I have limited choice what other users will sell. Also I need must-have feature: COM+LPT port and >=PCI slots. So it may not be easy to buy MB with such lucky combination and 2 native PS/2...

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DOS gives me freedom to unlimited HW access.

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