Ribbon Fault Recovery on an Electronic Typewriter
Original Publication Date: 1986-Nov-01
Included in the Prior Art Database: 2005-Mar-09
An electronic typewriter utilizing a resistive ribbon can detect when there is a ribbon fault causing either a poorly printed character or a missing character. Minimum operator effort is required to correct the misprint caused by the poorly printed or missing character. An electronic typewriter uses an interrupt-driven printer subsystem having a document/correction area memory that also functions as a printer buffer and causes printing. This permits an operator to key ahead of the printer. When the system detects that a ribbon error has occurred due to a poorly printed or missing character, it stops printing and notifies the operator by beeping and flashing a NOPRT annunciator.