Abstract: The apparatus is an improved web processor, which operates at a high web speed, and can achieve variable document lengths with only programmable changes. To achieve this result the web processor uses an improved tool and web drive control. The tool control insures that the tool contacts the web once per document length. The web drive control varies the web speed to mate with the tool during impact and then speed up or slows down the web to maintain a constant speed throughout the processing unit.

Abstract: A memory mapping unit enables different sized memory boards to be mapped in any order into any size memory address boundary in a microprocessor. Any 2.sup.K sized memory board (where N.ltoreq.K.ltoreq.M) can be mapped to any 2.sup.N address boundary. To accomplish this, a binary adder adds the 2's complement of the base address register with significant bits from the address buss. A series of logic gates are connected to the output of the binary adder and a board size mask register. The logic gates perform an "AND" operation on the output from the binary adder and the board size mask register. The outputs from the logic gates connect to a multiple input "NOR" gate. When all the inputs are logical "zero", indicating the address is on the board, a board enable command is produced which activates the memory board transceiver.

Abstract: A large area button in an electrical keyboard is prevented from jamming by being stabilized against tilt which results from depressive forces being applied remotely from the center of the button, the stabilization being achieved by the provision of two anti-roll bars attaching the button to the body of the keyboard and each preventing deviation of one of two axes of the button from being orthogonal both to one another and to the direction of depression of the button.

Abstract: The invention is a multipart continuous form having several plies and a means to securely fasten the plies which prevents longitudinal slippage. To achieve this result the form has a series of locking and connecting tabs cut along its edge. The locking tabs fasten the inner plies of the form to the connecting tab, thereby preventing longitudinal shifting.

Abstract: An apparatus is provided, for use in an impact printer, in which printer it is required that an impact producing hammer, or assembly of such hammers, be operable in more than one location, whereby the hammer or assembly of hammers is moved between operational positions, the operation of the hammer or assembly of hammers is inhibited except when correctly positioned for operation, any mispositioning of the hammer or assembly of hammers is automatically corrected, wear, introduced by movement of the hammer or assembly of hammers, is minimized, and high operational speed, of the printer, is attained.