(mess) pc9801: make ide almost work (nw)
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This one will actually try to boot with the changes noted in the source (the tvram change may work for sasi too along with the sasi rom in 2hdif.rom) but there appear to be pio timing issues so when it branches in the bootloader it lands on the wrong instruction.  The ide rom has a few 386 instructions in it so it won't work with the ux.