BWTWO(4S) — SPECIAL FILES
NAME
bwtwo − Sun-2 black and white frame buffer
SYNOPSIS
device bwtwo0 at mb0 csr 0x700000 priority 4 device bwtwo0 at mb0 csr vme obio 0x0 priority 4
DESCRIPTION
The bwtwo interface provides access to Sun-2 Monochrome Video Controller boards. 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.
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)).
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
DIAGNOSTICS
None.
BUGS
Use of vertical-retrace interrupts is not supported.
Sun Release 2.0 — Last change: 1 November 1984