A personal computer such as one of the IBM 5550 range (represented by the IBM 5530, 5540 and 5560) cannot be connected to a label printer because the two machines have completely different control commands. If a converter is placed between a personal computer of the said type and the label printer, the...http://www.google.com/patents/US5058055?utm_source=gb-gplus-sharePatent US5058055 - System for printing labels and tags, and a converter used therein
