The pin 14 trick is tested, didnt work. Desoldered pin loose, didnt post. Tied it to ground with wire, didnt post. Soldered it back again, works.

I think I'll leave it there, too exciting stuff to play with those pins...

Ok, now I'm confused. How a different keyboard controller can affect ISA bus speed?

Swapped AMIKEY-2 in there so MR BIOS v.1.65 works now. Vgaspd-tool gives now 9,5Mb/s when before it was 6,7Mb/s. Tried even with original BIOS so KBC is the only thing that is different and still got 7,5Mb/s.

This was new to me.