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Everything For A Hacker
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19990506-[HACK].iso
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HEXEDIT
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80X0393.ARJ
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SCROLL.ASM
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Assembly Source File
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1993-03-30
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1KB
|
45 lines
;
; scroll.asm by Rich Paul
; This is a scroll routine, required by the color printing routine
; cprint.asm. It takes 1/3 time of the bios routine.
;
.model small
.286
public scroll
.code
;-------------------------------------------------------------------------
; Scroll the screen one line.
; Calling conventions: Don't worry 'bout it
; All Registers Saved
scroll proc far
pusha ; Save std regs
push ds ; Save seg regs
push es
mov ax,0b800h ; Set seg regs --
mov ds,ax ; They're the same, but both for string
mov es,ax ; Commands
mov si,160 ; Set si to 160
xor di,di ; And di to 0
mov cx,(80*24) ; cx is number to words on screen
; - one row
rep movsw ; move everything
mov ax,0720h ; set up for spaces in white on black
mov cx,80 ; and one line (of words)
rep stosw ; store the words
pop es
pop ds
popa
ret
scroll endp
end