assume cs:code,ds:data
data segment
table dw ag0,ag30,ag60,ag90,ag120,ag150,ag180
ag0 db '0',0
ag30 db '0.5',0
ag60 db '0.866',0
ag90 db '1',0
ag120 db '0.866',0
ag150 db '0.5',0
ag180 db '0',0
data ends
code segment
start:
mov ax,data 表放在data段里面
mov ds,ax
mov ax,60 默认参数为60度，放在ax里
call show
mov ax,4c00h
int 21h
show:
push bx
push es
push si
cmp ax,0 检查参数，如果不正确，直接结束程序不显示
jb showret
cmp ax,180
ja showret
mov bx,0b800h
mov es,bx
mov ah,0
mov bl,30
div bl
mov bl,al
mov bh,0
add bx,bx
mov bx,table[bx]
mov si,160*12+40*2
shows: mov ah,[bx]
cmp ah,0
je showret
mov es:[si],ah
inc bx
add si,2
jmp short shows
showret: pop si
pop es
pop bx
ret
code ends
end start |
