TT is the paper tape reader or a printer device
other main devices
Code:MD0: system storage MD1: user hard drive ... your NC files area FD0: first floppy drive CN0: RS232 port
What are you trying to do ?
What is the full 2 lines of the alarm code information ?
If trying to read from a floppy drive...try
R FD0: (Filename) <WRITE>
or
R FD0:, <WRITE> ( this would read a file in as A.MIN , note the comma after the semicolon)
If trying to read from RS232 connection, try
R CN0:, <WRITE>