ICOP Technology ICOP-6050 User Manual page 28

nop
mov al, 0c5h
out 23h, al
nop
nop
Read the value of a configuration register
For example, read INDEX 3Ch :
Unlock c onfiguration register
mov al, 03ch
out 22h, al
nop
nop
in al, 23h
nop
nop
push ax
Lock configuration register
pop ax ;AL - result
Write data to configuration register
For example, write 0FFh to INDEX 3Bh :
Unlock configuration register
mov al, 03bh
out 22h, al
nop
nop
mov al, 0ffh
out 23h, al
nop
24 ICOP Embedded 386SX PC/104 AIO CPU Module User's Manual
nop
mov al, 000h
out 23h, al
nop
nop