Category : C Source Code
Archive   : WIND.ZIP
Filename : W_MEMCPY.ASM

 
Output of file : W_MEMCPY.ASM contained in archive : WIND.ZIP
title w_memcpy -- copies words from data ram to video ram

vid_ptr equ [bp+4]
dat_ptr equ [bp+6]
count equ [bp+8]

IFDEF LATTICE

; here's what Lattice uses -- if you're assembling for Lattice C, use
; masm /Dlattice w_memcpy;

DGROUP GROUP DATA
DATA SEGMENT WORD PUBLIC 'DATA'
ASSUME DS:DGROUP,ES:DGROUP,SS:DGROUP
DATA ENDS
PGROUP GROUP PROG
PROG SEGMENT BYTE PUBLIC 'PROG'
ASSUME CS:PGROUP

_snowFlag equ
_vidMem equ
_w_memcpy equ

ELSE

; this works for Microsoft or Turbo C -- assemble with the command:
; masm /MX w_memcpy;

.model small
.code

ENDIF

extrn _vidMem:word,_snowFlag:word
public _w_memcpy

_w_memcpy proc
push bp
mov bp,sp
push es
push si
push di
cld
mov ax,_vidMem
mov es,ax
mov cx,count

or cx,cx
jz done
mov di,vid_ptr
shl di,1
mov si,dat_ptr
test _snowFlag,1
jnz snow
rep movsw
jmp short done
snow: mov dx,3dah
more: lodsw
mov bx,ax
wait1: in al,dx
ror al,1
jb wait1
cli
wait2: in al,dx
ror al,1
jnb wait2
mov ax,bx
stosw
sti
loop more
done: pop di
pop si
pop es
pop bp
ret
_w_memcpy endp

IFDEF LATTICE
PROG ENDS
ENDIF

end


  3 Responses to “Category : C Source Code
Archive   : WIND.ZIP
Filename : W_MEMCPY.ASM
”

  1. Daniel says:
    January 27, 2013 at 3:59 pm

    Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

  2. Joshie says:
    March 18, 2014 at 4:57 pm

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  3. DiskingRound says:
    January 14, 2015 at 10:57 pm

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