Well, I just tried in qemu-9821 (after converting bank*.bin to pc98bios/itf/ide.bin, as the bank*.bin didn't want to work at all).
It didn't work
I guess the only way we'll get it to work is if someone with a pc9801bx4 is willing to dump and share its BIOS...
Btw.. to convert bank*.bin to pc98bios/itf/ide.bin:
copy /b bank5.bin + bank6.bin + bank7.bin pc98bios.bin
copy bank3.bin pc98ide.bin
copy bank4.bin pc98itf.bin
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