NEXCOM NEX 732L2G - Manual (Page 68)

67 Appendix B NEX732L2G User Manual
Reading Digit I/O data for register CRF1
mov dx, SIO_PORT
mov al,0F1h
out dx,al
inc dl
in al,dx ;You need data in AL register
SIO exit configuration procedure
mov dx, SIO_PORT
mov al, SIO_EXIT
out dx,al