88 lines
1.8 KiB
NASM
88 lines
1.8 KiB
NASM
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;NAME:- Chinmay M. Mule
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;CLASS:-SE COMP II SHIFT
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;ROLLNO:-34 PRN:-S18111044
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;Assignment Name:-Write 80387 ALP to plot Sine Wave, Cosine Wave. Access
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; video memory directly for plotting.
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.387
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.MODEL SMALL
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.DATA
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X DW 1
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Y DW 0
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Xrad DQ ?
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D60 DW 60
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D100 DW 100
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D180 DW 180
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PIby180 DQ ?
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TAB DB 80H,40H,20H,10H,8H,4,2,1
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OFS DW 0
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.CODE
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START: MOV AX,@DATA
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MOV DS,AX
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MOV AH,00 ;Set video mode
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MOV AL,06 ;Mode 6 i.e. 640 by 200 Graphics
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INT 10H
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FINIT
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FLDPI
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FIDIV D180
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FSTP PIby180
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DRAWSINE:
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FILD X ;Load angle
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FLD PIby180 ;Convert to radian
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FMUL ;i.e. multiply by Pi/180
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FST Xrad
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FSIN ;Calculate sine
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FDIV Xrad
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FILD D60 ;Load amplitude
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FMUL ;Calculate Amplitude x sin
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FILD D100
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FSUBR
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FISTP Y
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CALL OFSCAL
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INC X ;Next angle
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CMP X,639 ;Last point on X axis
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JNE DRAWSINE
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EXIT:
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MOV AH,0
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INT 16H
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MOV AH,00 ;Set video mode
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MOV AL,02 ;Mode 2 i.e. 80 by 25 text
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INT 10H
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MOV AH,4CH
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INT 21H
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OFSCAL PROC NEAR
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MOV AX,Y
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AND AX,1
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JZ L1
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MOV OFS,2000H
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L1: MOV AX,Y
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SHR AX,1
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MOV BX,50H
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MUL BX
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ADD OFS,AX
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MOV AX,X
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MOV CL,3
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SHR AX,CL
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ADD OFS,AX
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LEA BX,TAB
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MOV AX,X
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AND AX,07
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XLAT
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MOV BX,OFS
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MOV DX,0B800H
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MOV ES,DX
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OR ES:[BX],AL
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MOV OFS,0
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RET
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OFSCAL ENDP
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END START
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