The PC11 High speed reader and punch is capable of reading eight-hole unoiled perforated paper tape at 300 characters per second, and punching tape at 50 characters per second. The system consists of a paper tape reader/punch and control. A unit containing a reader only (PR11) is also available.

Operation
In reading tape, a set of photodiodes translate the presence or absence of holes in the tape to logic levels representing 1's and 0's. In punching tape, a mechanism translates logic levels representing 1's and 0's to the presence or absence of holes in the tape. Any information read or punched is parallel-transformed through the Control. When an address is placed on the UNIBUS, the Control decodes the address and determines if the reader or punch has been selected. If one of the four device register addresses have been selected, the Control determines whether an input or an output operation should be performed. An input operation from the reader is initiated when the processor transmits a command to the Paper Tape Reader Status register. An output operation is initiated when the processor transfers a byte to the Paper Tape Punch Buffer Register.