ffb is a 24-bit UPA-based color frame buffer and graphics accelerator which comes in the two configurations: single buffered frame and double buffered frame.
Single buffered frame buffer
Consists of 32 video memory planes of 1280 x 1024 pixels, including
24-bit single-buffering and 8-bit X planes.
Double buffered frame buffer Consists of 96 video memory planes of 1280 x 1024 pixels, including 24-bit double-buffering, 8-bit X planes, 28-bit Z-buffer planes and 4-bit Y planes.
The driver supports the following frame buffer ioctls which are defined in fbio(7I):
FBIOPUTCMAP, FBIOGETCMAP, FBIOSVIDEO, FBIOGVIDEO, FBIOVERTICAL, FBIOSCURSOR, FBIOGCURSOR, FBIOSCURPOS, FBIOGCURPOS, FBIOGCURMAX, FBIO_WID_PUT, FBIO_WID_GET
/dev/fbs/ffb0 device special file
ffbconfig(1M), mmap(2), fbio(7I)