monochromatic frame buffer
bwtwo* at sbus?
wsdisplay* at bwtwo?
bwtwo is an SBus monochrome frame
bwtwo driver interfaces the frame
buffer with the
wscons(4) console framework. It does not provide direct device driver
entry points but makes its functions available via the internal
intro(4), sbus(4), wscons(4), wsdisplay(4)