Abstract: A sheet feeder for an impact daisywheel type printer is interconnected with an existing system by reconnecting the ASCII type data cable to the sheet feeder. The internal logic of the sheet feeder is cabled to the printer and provides for all necessary automatic control. The sheet feeder also includes a mechanical bail control which opens the bail to allow for automatic feeding of the paper around the platen.

Abstract: An impact printer of the daisywheel type mechanically links together two daisywheel printer carriages so that the total number of different characters that can be printed is doubled. Suitable coordination logic provides for operation in a first concurrent (or parallel) mode where the user's software looks ahead to provide for continuous printing along a single line. The other mode of operation is sequential where the twin print heads are substantially transparent to the user's system and thus the appropriate print head automatically positions itself to a printing position.