[2013-08-29 16:26] 实验16
assume cs:code
code segment
;将中断例程写在前面可以避免一些麻烦
setscreen:jmp short set
table dw sub1,sub2,sub3,sub4
set:push bx
push ax
cmp ah,3
ja sret
mov bl,ah
mov bh,0
add bx,bx
mov bx,table[bx+200h]
add bx,200h
call bx
sret:pop ax
pop bx
iret
sub1:push bx
push cx
push es
mov bx,0b800h
mov es,bx
mov bx,0
mov cx,2000
sub1s:mov byte ptr es:[bx],' '
add bx,2
loop sub1s
pop es
pop cx
pop bx
ret
sub2:push bx
push cx
push es
mov bx,0b800h
mov es,bx
mov bx,1
mov cx,2000
sub2s:and byte ptr es:[bx],11111000b
or es:[bx],al
add bx,2
loop sub2s
pop es
pop cx
pop bx
ret
sub3:push ax
push bx
push cx
push es
mov cl,4
shl al,cl
mov bx,0b800h
mov es,bx
mov bx,1
mov cx,2000
sub3s:and byte ptr es:[bx],10001111b
or es:[bx],al
add bx,2
loop sub3s
pop es
pop cx
pop bx
pop ax
ret
sub4:push cx
push si
push di
push es
push ds
mov si,0b800h
mov es,si
mov ds,si
mov si,160
mov di,0
cld
mov cx,24
sub4s:push cx
mov cx,160
rep movsb
pop cx
loop sub4s
mov cx,80
mov si,0
sub4s1:mov byte ptr [160*24+si],' '
add si,2
loop sub4s1
pop ds
pop es
pop di
pop si
pop cx
ret
setscreen_end:nop
start:mov ax,code
mov ds,ax
mov si,offset setscreen
mov ax,0
mov es,ax
mov di,200h
mov cx,offset setscreen_end-offset setscreen
cld
rep movsb
cli
mov word ptr es:[7ch*4],200h
mov word ptr es:[7ch*4+2],0
sti
mov ax,0
;mov ax,0101h
;mov ax,0201h
;mov ax,0300h
int 7ch
mov ax,4c00h
int 21h
code ends
end start
code segment
;将中断例程写在前面可以避免一些麻烦
setscreen:jmp short set
table dw sub1,sub2,sub3,sub4
set:push bx
push ax
cmp ah,3
ja sret
mov bl,ah
mov bh,0
add bx,bx
mov bx,table[bx+200h]
add bx,200h
call bx
sret:pop ax
pop bx
iret
sub1:push bx
push cx
push es
mov bx,0b800h
mov es,bx
mov bx,0
mov cx,2000
sub1s:mov byte ptr es:[bx],' '
add bx,2
loop sub1s
pop es
pop cx
pop bx
ret
sub2:push bx
push cx
push es
mov bx,0b800h
mov es,bx
mov bx,1
mov cx,2000
sub2s:and byte ptr es:[bx],11111000b
or es:[bx],al
add bx,2
loop sub2s
pop es
pop cx
pop bx
ret
sub3:push ax
push bx
push cx
push es
mov cl,4
shl al,cl
mov bx,0b800h
mov es,bx
mov bx,1
mov cx,2000
sub3s:and byte ptr es:[bx],10001111b
or es:[bx],al
add bx,2
loop sub3s
pop es
pop cx
pop bx
pop ax
ret
sub4:push cx
push si
push di
push es
push ds
mov si,0b800h
mov es,si
mov ds,si
mov si,160
mov di,0
cld
mov cx,24
sub4s:push cx
mov cx,160
rep movsb
pop cx
loop sub4s
mov cx,80
mov si,0
sub4s1:mov byte ptr [160*24+si],' '
add si,2
loop sub4s1
pop ds
pop es
pop di
pop si
pop cx
ret
setscreen_end:nop
start:mov ax,code
mov ds,ax
mov si,offset setscreen
mov ax,0
mov es,ax
mov di,200h
mov cx,offset setscreen_end-offset setscreen
cld
rep movsb
cli
mov word ptr es:[7ch*4],200h
mov word ptr es:[7ch*4+2],0
sti
mov ax,0
;mov ax,0101h
;mov ax,0201h
;mov ax,0300h
int 7ch
mov ax,4c00h
int 21h
code ends
end start
评论次数(0) |
浏览次数(457) |
类型(汇编作业) |
收藏此文 |