Protech Systems PMB-531LF User Manual page 51

Chapter 3 Software Configuration
mov al,00h
out dx,al
mov dx,(800h + 67h)
mov al,00h
out dx,al
mov dx,(800h + 68h)
mov al,00h
out dx,al
Page:3-12
;Clear Status Bit
PMB-531LF USER
'
S MANUAL