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SMG(4) Device Drivers Manual (vax) SMG(4)

smgSmall Monochrome Graphics frame buffer

smg0 at vsbus0 csr 0x200f0000
wsdisplay* at smg?

The smg is a monochrome frame buffer found on-board most VAXstation 3100 systems.

The smg 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 wsdisplay(4) interface.

When a color option board (either a gpx(4) or a spx frame buffer) is installed, the smg driver will not attach by default, since the color option takes over the video connector on the back of the system. However, the output signal pins are independent, and it is possible to connect a monochrome video cable even if a color option board is installed. To force the smg driver to attach in this case, change the device flags to 1. It will however not be possible to use the monochrome frame buffer as the OpenBSD console in this case.

intro(4), vsbus(4), wscons(4), wsdisplay(4)

March 31, 2008 OpenBSD-5.3