mda_convert_attr
scr_writew(mda_convert_attr(scr_readw(s++)), dest++);
u16 eattr = mda_convert_attr(c->vc_video_erase_char);
mda_convert_attr(c->vc_video_erase_char),
u16 eattr = mda_convert_attr(c->vc_video_erase_char);