Shortly after the IBM PC came out, makers of other brands of computers, and even typewriter makers, started copying its style of key, where fingers are guided by a cylindrical surface instead of a spherical one. The usefulness of a reducible surface, to which key overlays could be attached, was obvious, and it was considered to look more "modern" as well. Some point-of-sale keyboards use keys with flat keytops instead, but the old-style key seems to be completely gone these days as far as current manufacture is concerned.