NAME    [Toc]    [Back]

     cgthree - 8-bit color frame buffer

SYNOPSIS    [Toc]    [Back]

     cgthree* at sbus? slot ? offset ?
     wsdisplay* at cgthree?

DESCRIPTION    [Toc]    [Back]

     The cgthree is an SBus color frame buffer.

     The cgthree 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    [Toc]    [Back]

     If  the cgthree frame buffer is used as the console display,
it is possible,
 for some models, to select a different resolution  than
the default
     1152x900  or  1024x768 by changing the OpenPROM environment.
To change the
     default resolution, type the following:

       ok setenv output-device screen:r1152x1024x66

     to change to a 66Hz 1280x1024 resolution.

     If the cgthree frame buffer is a secondary display, or a serial console
     is  used,  the display resolution can not be changed without
using an
     nvramrc OpenPROM script.  Refer to the Sun Frame Buffer  FAQ
for details.

     The cgthree frame buffer accepts the following resolutions:

     screen:r1024x768x77    Super  VGA  1024x768,  with a refresh
rate of 77Hz.
                           This is the default setting  on  model
501-2691.
     screen:r1152x900x66   Standard 1152x900, with a refresh rate
of 66Hz.
                           This is the default setting  on  older
models
                           (501-1415 and 501-8044).
     screen:r1152x900x76   Standard 1152x900, with a refresh rate
of 76Hz.
                           This is the default  setting  on  more
recent models
                           (501-1718 and 501-1909).

     Note  that  not all models support settings other than their
default setting.

SEE ALSO    [Toc]    [Back]

     agten(4), bwtwo(4), cgsix(4), creator(4), intro(4),  mgx(4),
rfx(4),
     sbus(4), vgafb(4), wscons(4), wsdisplay(4), zx(4)

     Sun   Frame  Buffer  FAQ,  http://www.sunhelp.org/faq/Frame-
Buffer.html.

OpenBSD     3.6                         January      5,      2003