BWTWO(4S) — SPECIAL FILES
NAME
bwtwo − Sun-3/Sun-2 black and white frame buffer
SYNOPSIS — SUN-3
device bwtwo0 at obmem 1 csr 0xff000000 priority 4 device bwtwo0 at obmem 2 csr 0x100000 priority 4
The first synopsis line given above should be used to generate a kernel for a Sun-3/160; the second, for a Sun-3/75M.
SYNOPSIS — SUN-2
device bwtwo0 at obmem 1 csr 0x700000 priority 4 device bwtwo0 at obio 2 csr 0x0 priority 4
The first synopsis line given above should be used to generate a kernel for a Sun-2/120 or Sun-2/170; the second, for a Sun-2/50 or Sun-2/160.
DESCRIPTION
The bwtwo interface provides access to Sun Monochrome Video Controller boards.
bwtwo supports the FBIOGTYPE ioctl, which programs may use to determine the characteristics of the display device, and supports the FBIOGPIXRECT ioctl, which allows SunWindows to be run on it (see fbio(4S)).
If flags 0x1 is specified, copy memory will be used in the frame buffer if applicabale. Copy memory makes certain frame buffer faster at the expense of 128K bytes of memory.
Reading or writing to the frame buffer is not allowed − you must use the mmap(2) system call to map the board into your address space.
FILES
/dev/bwtwo[0-9]
SEE ALSO
BUGS
Use of vertical-retrace interrupts is not supported.
Sun Release 3.0β — Last change: 16 September 1985