extrn   _textstakptr:dword, _vgatextptr:dword, _vgadefcolorz:byte

extrn   _initvga50:near, _putstr:near, _textbox0:near, _textbox1:near
extrn   _pushtext:near, _poptext:near, _getstr:near, _setchars:near
extrn   _centerscr:near