service adler
{
        system
                IRQCTL          # 19
                DEVIO           # 21
        ;
        ipc
                SYSTEM pm rs tty ds vm vfs
                pci inet lwip amddev
                ;
    uid 0;
};

# cp adler /usr/src/minix/drivers/
# cd /usr/src/minix/drivers/adler
# make
# make install

# mknod /dev/adler c 20 0
# service up /service/adler -dev /dev/adler

# head -c 8 /dev/adler | xargs echo
00000001
# echo "Hello" > /dev/adler
# head -c 8 /dev/adler | xargs echo
078b01ff
# head -c 8 /dev/adler | xargs echo
00000001

# echo "Hello" > /dev/adler
# service update /service/adler -dev /dev/adler
# head -c 8 /dev/adler | xargs echo
078b01ff