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-
- ;************************************************************************
- ; Write 'Hello' in the middle of the 80x25 screen using *
- ; BIOS function 13hex, and move cursor to the start of next *
- ; line by including CARRIAGE RETURN and LINEFEED in the text *
- ;************************************************************************
-
- CARRIAGE_RETURN EQU 0DH
- LINE_FEED EQU 0AH
-
- Text DB 'Hello', CARRIAGE_RETURN, LINE_FEED
-
- PUBLIC _BIOS_Write_String
-
- _BIOS_Write_String PROC NEAR
- PUSH ES ;Preserve registers
- PUSH BP
-
- MOV AX,CS ;Get pointer to the string
- MOV ES,AX ;into register pair ES:BP
- LEA BP,Text
- MOV BX,0 ;Select page 0
- MOV BL,7 ;Use normal attribute
- MOV CX,5 ;Display 5 characters
- MOV DH,12 ;Start at row 12
- MOV DL,40 ;Start at column 40
- MOV AH,13H ;Function = WRITE TEXT STRING
- MOV AL,0H ;Subfunction = Update Cursor Pos.
- INT 10H ;Ask BIOS to display the text
-
- POP BP
- POP ES ;Restore segment register
- RET
- _BIOS_Write_String ENDP