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;* ClearBox - Clears portion of screen with specified fill attribute.
;*
;* Shows:   BIOS Interrupt - 10h, Function 6 (Scroll Up)
;*
;* Params:  Attr - Fill attribute
;*          Row1 - Top screen row of cleared section
;*          Col1 - Left column of cleared section
;*          Row2 - Bottom screen row of cleared section
;*          Col2 - Right column of cleared section
;*
;* Return:  None
 
ClearBox PROC,
        Attr:WORD,
        Row1:WORD,
        Col1:WORD,
        Row2:WORD,
        Col2:WORD
 
        mov     ax, 0600h               ; Scroll service
        mov     bh, BYTE PTR Attr       ; BH = fill attribute
        mov     ch, BYTE PTR Row1       ; CH = top row of clear area
        mov     cl, BYTE PTR Col1       ; CL = left column
        mov     dh, BYTE PTR Row2       ; DH = bottom row of clear area
        mov     dl, BYTE PTR Col2       ; DL = right column
        int     10h                     ; Clear screen by scrolling up
        ret
 
ClearBox ENDP
                                    -♦-