
;************************************************************************
; Load CRT register 0Ah with the value 20h                              *
; Faster way (too fast for some chip sets)                              *
;************************************************************************

Fast_Change_Underline   PROC NEAR
        MOV     DX,3D4H                 ;Fetch CRTC address (assumes color)
        MOV     AX,200AH                ;Fetch data and index
        OUT     DX,AX                   ;Select index and write data
        RET
Fast_Change_Underline   ENDP
