The original project is CaTer for the C64. That project was ported to the Apple II and ATARI as part of Telnet65.
The ATARI version of CaTer uses a 40x24 screen layout and writes directly to screen memory. Therefore no 80 column displays (e.g. XEP80 or VBXE) are supported.
The ATARI system keyboard handler doesn't provide access to all potential control codes or special characters. Press HELP or OPTION+H to get help about entering those codes/characters.
The key combination OPTION+Q quits the current Telnet session.
In a shell, enter these commands for full functionality:
export LANG=C
export TERM=vt100
stty cols 40 rows 24
The Apple //e version of Cater doesn't support the VT100 character attributes bold or underline. So you e.g. aren't able to see which files you have selected for a multi-file operation in Midnight Commander.
The four Apple //e cursor keys generate the same codes as the key combinations Ctrl+H, Ctrl+J, Ctrl+K and Ctrl+U. Therefore entering those key combinations doesn't send them to the Telnet server but instead sends the four VT100 cursor movement codes. However you can send the key combinations in question to the Telnet server by entering them while holding down the Open Apple key.
The key combination Open Apple+Q quits the current Telnet session.
In a shell, enter these commands for full functionality:
export LANG=C
export TERM=vt100
stty cols 80 rows 24
The C64 version of CaTer does not support a soft80 display. It makes use of the C64 color capabilities in two ways. Please read the CaTer Docu - ESC Sequences section Select Graphic Rendition (SGR) to understand them.
You need to check out CaTer Docu - Keyboard in order to know the mapping of C64 keys to VT100 keys. The eight C64 F-keys are mapped as well, but as the original VT100 terminal has only four F-keys the the rest of the C64 F-keys are not recognized by most remote programs.
The key combination C=+Q quits the current Telnet session.
In a shell, enter these commands for full functionality:
export LANG=C
export TERM=vt100
stty cols 40 rows 25
The hints below are by no means specific to CaTer. They are rather just some useful general Midnight Commander usage info.
Use ESC+1 to ESC+0 as alternative to the ten F-keys. Press ESC twice to "escape". Use Ctrl+T to toggle the selection for multi-file operations.
On the C64 you can start Midnight Commander with the option -c to force the usage of colors although the original VT100 terminal doesn't support colors.