DG>>  jb> dark.... I forget the platform you were targeting.)
DG>> DOS, using Watcom C 10.0.
 jb> DPMI or Real/V8086 mode?

DPMI

DG>> " mov cx,16000"\
 jb> in DPMI the op-code REP uses ECX as the counter
 jb> and your code was only setting CX..., try " mov Ecx,16000"\

That shouldn't be a problem since the routine does evidently work, except
in the situation i stated before.