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Terminal emulator for ASR-33.

screenshot

Features:

  • Pygame and Tkinter frontends.

  • Backends for pty (Linux/Mac) and ssh (Paramiko library)

  • Limits output to an authentic 10 characters per second. Hit F5 to make it go faster (toggle on tkinter frontend, hold on pygame)

  • Scrolling (with page up and down - tkinter frontend has a scrollbar)

  • Output a form feed to clear everything

Various bugs and to-dos:

  • No user interface to select between frontends and backends. For now, edit the script.

  • Speed throttling (whether through the backend or throttle.py) does not work well on Linux. It works on WSL, and the last time I checked this technique worked on macOS. You'll still get the 10-chars-per-second output, but interrupting long outputs won't work.

  • Most of the fun termios functions (echoprt, echok, kill, reprint, discard) don't work on WSL

  • Add tty-37 support (half lines, reverse line feed, and lowercase). For now, the forced uppercase can be disabled by editing the upper() function

  • Add backends for wslbridge and msys/cygwin.

  • Improve graphics, better font, allow "ink spread" for overstruck bold.

  • Simulate classical 'stty lcase' line discipline for input of upper/lowercase letters and `{|}~ (part or all of this are broken in modern OSes)

  • Discard and regenerate scrollback to limit memory usage. The AbstractLine class I created should be useful for this, but nothing is hooked up.