NEC PC-9801 extension board slot
The file /dev/pcexmem is an
mmap(2) capable interface to the memory area
of the installed board at "NEC PC-9801 extension board slot" on
LUNA-88K2. Byte offsets in this file are interpreted as relative memory
addresses of the installed board. The range should be between 0x0 and
The I/O port area of the installed board is accessed via the file
/dev/pcexio in the same manner as
/dev/pcexmem. The range should be between 0x0 and
The following ioctl(2) calls
apply to /dev/pcexmem and
/dev/pcexio in order to handle interrupts of this
extension slot. Currently 7 levels of interrupt (0 to 6) are supported.
- Register the specified interrupt level with this driver to handle.
- Unregister the specified interrupt level with this driver.
- Wait for the interrupt with the specified level.
The /dev/pcexmem and /dev/pcexio
files first appeared in OpenBSD 5.6.
- PCEXWAITINT timeouts (currently 1 second).