BAUDOT · ITA2 SIMULATOR

5-Bit Teleprinter Character Code · The Common Substrate

Input

LETTERS mode prints A–Z and a handful of control codes. FIGURES mode prints digits and punctuation. A real teleprinter switches between modes with the LTRS / FIGS shift codes — here you can pick the mode to see each interpretation of the same 5-bit pattern.

Tape Frame — single character

character: — · 5-bit code: — · frame: 7.5 bits @ 50 baud = 150 ms

hole = mark (1) = current step (Stromschritt)

no hole = space (0) = stop step (Stoppschritt)

sprocket (transport, no data)

Decoded in Three Standards

ITA1 / CCITT-1 (1926)

—

awaiting input

— — — — —

ITA2 / CCITT-2 (1930)

—

awaiting input

— — — — —

USTTY (U.S. variant)

—

awaiting input

— — — — —

Divergence detected:

Type a Message — Watch the Tape Punch

When digits or punctuation appear, a FIGS shift character is inserted before them, and a LTRS shift follows. This is exactly what a real ITA2 teleprinter does — and why the tape is longer than your typed message.

Punched Tape — scrollable

0 characters · 0 frames

— no tape punched yet —