hardware fixes (AMD K6, K6-2 and K6-III in Socket 7 boards by NMC)

NMC doesn't officialy provide support for K6 in old boards. But there are mainboards which can run the K6.

Yes !
2.2V, 66MHz [1-2on, 5-6on], 2x [J6=2-3, J7=1-2, J8=1-2]
There seems to be no support for voltages between 2.2 and 2.8V. Any idea ?
Available are 2.1, 2.2, 2.8, 2.9, 3.2V.