Control Data 1700 Maintenance Manual page 30

information from the computer to the page printer while read
operations will transfer information from the paper tape reader to
the computer and the page printer. Simultaneously, a new tape can
be prepared from keyboard entry.
NOTE: If the LINE/LOCAL/OFF switch is placed in LOCAL position with
T mode selected, the reader and printer are connected on one
circuit while the keyboard and punch are connected on another
circuit. The keyboard-punch combination can be used to
prepare a new tape while the reader-printer combination can
be simultaneously used to verify a previously punched tape.
(4) Tape-to-Tape Send Mode - TTs
When the Mode Control switch is placed in the TTs position, the
paper tape reader is the only unit connected to the computer. The
page printer is completely disconnected while the keyboard and punch
are connected together off-line. In this mode, only read operations
are allowed; however, since the page printer is inactive, tapes of
5, 6, 7, or 8 levels can be read into the computer. The off-line
function of the keyboard and punch is the same as for T mode.
(5) Tape-to-Tape Receive Mode - TTr
When the Mode Control switch is placed in the TTr position, the
paper tape punch is the only unit connected to the computer. The
page printer, keyboard and reader are inactive in this mode. In the
TTr mode, only write operations are allowed; however, since the page
printer is inactive, l-inch tapes of 5, 6, 7, or 8 levels can be
punched with information from the computer.
The 1713 teletypewriter is an ASR which has been modified to allow mode selection
2-3