MGX(4)                OpenBSD Programmer's Manual (SPARC)               MGX(4)

NAME
     mgx - SMS MGX and MGXPlus accelerated 8/24-bit color frame buffers

SYNOPSIS
     mgx* at sbus?
     wsdisplay* at mgx?

DESCRIPTION
     The Southland Media Systems (now Quantum 3D) MGX and MGXPlus are SBus
     color frame buffers, with graphics acceleration capabilities.

     The mgx 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.

DISPLAY RESOLUTION
     The MGX and MGXPlus frame buffers will adapt their resolution to the mon-
     itor they are connected to.  However, when not connected to a Sun moni-
     tor, the device will default to the cgthree(4)-compatible 1152x900 reso-
     lution, with a refresh rate of 66Hz.  A different resolution can be
     forced using the set of DIP switches (sometimes covered by metal foil)
     located near the SBus connector on the board itself.

     The DIP switch settings are as follows:

     Switches         Resolution    Refresh    Details
     1   2   3   4                  Rate

     OFF OFF OFF OFF  1024x768      77Hz
     OFF ON  OFF OFF  1280x1024     76Hz
     ON  ON  OFF OFF  1152x900      66Hz
     OFF OFF ON  OFF  1152x900      76Hz
     OFF ON  ON  OFF  1152x900      77Hz
     ON  ON  ON  OFF  1152x900      66Hz       cgthree compatible
     ON  ON  OFF ON   1152x900      66Hz       cgsix compatible
     OFF OFF ON  ON   1280x1024     67Hz
     ON  ON  ON  ON   probed        probed     factory default

     All other combinations are unsupported and may damage the hardware.

SEE ALSO
     intro(4), sbus(4), wscons(4), wsdisplay(4)

CAVEATS
     This driver does not support mode switching at the moment, and drives the
     card in PROM-compatible, 8 bit, mode only.

OpenBSD 4.7                     April 15, 2008                               1
