AlessandroB wrote on 2020-10-12, 16:48:

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4)i am totally sure about socket for cache because near the S3 chip there are also 2 socket for the video memory. Never seen a cache chip like that...

OK, in that case this is something really weird - and a clear photograph of the board could clarify matters.

@Alessandro, if you have a floppy disk installed, you can also buy a USB External Floppy disk so you can copy files from the Win 10 machine. But it's a bit tricky with making them bootable. Or if you have a CD Rom availabe, you can burn CD's from Win 10.

I stopped for a moment to create the dos 6.22 installation floppies. it was very difficult only with a mac and a pc microserver with win10.