Altos IV User Manual page 32

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When the terminal is turned on, error codes 0, 9, or P appear at the
lower right side of the screen.
Simultaneously press the SHIFT and SETUP keys, and then press the Y key.
If the error code continues, the terminal needs to be serviced by a qualified
technician.
Nonsense characters (garbage) appear on the screen.
Match the terminal's baud rate, parity bit, stop bit, and data bit parameters
with the computer (as explained in Chapter 2). Also, the pin connections
listed in Appendix B must match your computer's requirements.
Every character appears twice.
Select FDX (full-duplex) for the MODE setup parameter.
The computer responds to commands but data typed does not appear
on the screen.
Select HDX (half-duplex) for the MODE setup parameter.
Troubleshooting