The standard PDP-3 Paper Tape Punch has a nominal speed of 20 lines per
second. It can operate in either the alphanumeric mode or the binary
mode.
Alphanumeric Mode
ppa iot 5
For each In-Out Transfer instruction one line of tape is punched. In-Out
Register bit 35 conditions hole #1. Bit 34 conditions hole #2, etc. Bit
28 conditions hole #8.
Binary Mode
ppb iot 6
For each In-Out Transfer instruction one line of tape is punched. In-Out
Register bit five conditions hole #1. Bit four conditions hole #2, etc.
Bit zero conditions hole #6. Hole #7 is left blank. The #8 hole is
always punched in this mode.