NAME

cgtwelve − 24-bit SBus color memory frame buffer and graphics accelerator

CONFIGURATION

device-driver cgtwelve

DESCRIPTION

cgtwelve is a 24-bit SBus-based color frame buffer and graphics accelerator, with 12-bit double buffering, 8-bit colormap, and overlay/enable planes.  It provides the standard frame buffer interface defined in fbio(4S), paired with microcode which can be downloaded using gpconfig(8).  Application acceleration is achieved using the Pixwin and SunPHIGS Application Programmer Interfaces (APIs). 

The cgtwelve has registers and memory that may be mapped with mmap(2), using the offsets defined in <sbusdev/cg12reg.h>. 

When in double-buffer mode, each channel is dithered to 4 bits, yielding 12-bit double-buffering. 

FILES

/dev/cgtwelve0 device special file

/dev/fb default frame buffer

/usr/include/sbusdev/cg12reg.h
device-specific definitions

SEE ALSO

mmap(2), fbio(4S), gpconfig(8)

Sun Release 4.1  —  Last change: 3 July 1990