BWTWO(4S) — SPECIAL FILES
NAME
bwtwo − Sun two black and white frame buffer
SYNOPSIS
device bwtwo0 at mb0 csr 0x700000 priority 3
DESCRIPTION
The bwtwo interface provides access to Sun-2 Monochrome Video Controller boards. It supports the FBIOGTYPE ioctl which a program can use to inquire as to the characteristics of the display device; see fbio(4S)
It 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 1.1 — Last change: 21 March 1984