First post, by Kouwes
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I have this 486 board: https://theretroweb.com/motherboards/s/pcchips-m601-ver.-1.0
There is some minor battery damage but nothing serious. But I'm looking for the manual, because I'd like to know what JP2 is for.
It was jumpered at 2-3. There was also a jumper on 2-3 of the EXT (JP1) header but that, according to the V1.2 manual, is the factory setting - if you want to use an external battery you need to remove it.
Which is pretty obvious since I always use 4 pin CD-ROM sound cables.
The other versions of this board (V1.2 and 1.3x) also have this header but it's not specified in the manual.