the BIOS is only needed for cards that can only be adjusted by BIOS, rather than hw jumpers, and/or for reading out the actual values of the cards.
Microchannel is MCA, and/or the bus IBM developed for the PS/2 series. None of those cards will fit. They were better than the ISA bus, and maybe better than EISA. In any case, due to lower volume of sales, they were always more expensive.
In the end, IBM dropped the rspc and mca architetures and only used CHRP (Common Hardware Reference Platform) starting around 2001 or 2002. Not sure if CHRP is still the norm for current systems (NIM refers to systems now as 64 - for 64 bit)