ISA I/O mapped as GPIO
isagpio0 at isa? port 0x78
isagpio1 at isa? port 0x80
gpio* at isagpio?
isagpio driver allows access to the
8-bit ISA I/O space through the
framework, thus making use of the simple GPIO devices connected directly to
the ISA bus.
gpio(4), intro(4), isa(4), gpioctl(8)
isagpio driver first appeared in
isagpio driver was written by