The VFU tape (fig. 2-3) is standard one-inch wide opaque paper or mylar tape. if comes with prepunched sprocket holes
that correspond to the lines on a form. Additional holes, known as channel code holes, may be punched in the tape by the
punch and splicer device. Although eight channel code holes may be punched, only two are recognized by the line printer.
They are channel one code hole for Form Feed (FF) and channel six code hole for Vertical Tab (VT).
Figure 2-3. VFU Punched Tape
FF code holes in the tape are used to define top of form (fig. 2-4) and to ensure hat printout always begins in the right
place on the form. VT code holes in the ape are used to skip lines on the form and, like a typewriter, stop the paper at a
Figure 2-4. Top of Form and Vertical Tabs