n=8
include 'win32ax.inc'
IO:
invoke CreateFile,f,GENERIC_WRITE,0,0,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,0
mov [h],eax
p0:

invoke WriteFile,[h],b,n+2,r,0
mov cl,1
mov ebx,n

p1:
dec ebx
mov ch,cl
and cl,[b+ebx]
xor [b+ebx],ch
cmp ebx,0
ja p1

cmp cl,0
je p0

invoke CloseHandle,[h]
invoke MessageBox,HWND_DESKTOP,"binary is written to file","binary",MB_OK
invoke ExitProcess,0
.end IO;
f db 'bin.txt',0
b db n dup 48,13,10,0
h rd 1
r rd 1
    

The Windows version is a bit faster in my system than the DOS

2 wrote:

The Windows version is a bit faster in my system than the DOS

I expect the native 32 bit code is giving you the speedup. NTVDM will impose a slowdown if you are using ports and other such "forbidden" things in the DOS code. But otherwise it is running at natve 16-bit code speed the same as real DOS. Unless of course you count the occasional Win32 interrupts and other background housekeeping things (<1% usually).