FDC37C665GT Datasheet, PDF (118/152 Pages) SMSC Corporation – High-Performance Multi-Mode Parallel Port Super I/O Floppy Disk Controllers

;-----------------------------.
; ENTER CONFIGURATION MODE |
;-----------------------------'
MOV DX,3F0H
MOV AX,055H ;use 044H for FDC37C666GT
CLI
; disable interrupts
OUT DX,AL
OUT DX,AL
STI
; enable interrupts
;-----------------------------.
; CONFIGURE REGISTERS CR0-CRx |
;-----------------------------'
MOV DX,3F0H
MOV AL,00H
OUT DX,AL ; Point to CR0
MOV DX,3F1H
MOV AL,3FH
OUT DX,AL ; Update CR0
;
MOV DX,3F0H ;
MOV AL,01H
OUT DX,AL ; Point to CR1
MOV DX,3F1H
MOV AL,9FH
OUT DX,AL ; Update CR1
;
; Repeat for all CRx registers
;
;----------------------------.
; EXIT CONFIGURATION MODE |
;----------------------------'
MOV DX,3F0H
MOV AX,0AAH
OUT DX,AL
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