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PROG080.ASM
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Assembly Source File
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1988-04-10
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1KB
|
30 lines
;************************************************************************
; Draw a box in upper left corner using BIOS function *
; WRITE PIXEL *
;************************************************************************
BIOS_Write_Pix EQU 0CH
PUBLIC _BIOS_Pixel_Write
_BIOS_Pixel_Write PROC NEAR
; We use CX as a pixel counter as well as pixel address
; and use DX as a raster counter as well as raster address
MOV DX,100 ;Want to draw 100 rasters
Box_Raster_Loop: ;Loop over rasters
MOV CX,100 ;Want to draw 100 pixels across
Box_Pixel_Loop: ;Loop over pixels within raster
MOV AL,1 ;Set color to be 1
MOV AH,BIOS_Write_Pix ;Function = WRITE PIXEL
INT 10H ;Ask BIOS to write pixel
DEC CX ;Update column number
JGE Box_Pixel_Loop ;If not last do it again
DEC DX ;Update row number
JGE Box_Raster_Loop ;If not last row do it again
RET
_BIOS_Pixel_Write ENDP