Atari XM301 Owner's Manual page 37

Caution:
The default values for these attributes are shown below.
You will need to restore the default values before you can
communicate with many services and bulletin boards.
The following is a summary of the attributes in the Options Menu:
Input parity
Type I to cycle through the following choices:
NONE — ignores parity (bit 7)
EVEN — checks for even parity
ODD — checks for odd parity
CLR — always sets bit 7 to 0
Output parity
Type O to cycle through the following choices:
NONE — bypasses any parity setting
EVEN — sets bit 7 for even parity
ODD — sets bit 7 for odd parity
SET — always sets bit 7 to 1
Left margin
Type L to toggle the left margin setting between 0 and 2. If you
change the left margin while communicating online, the screen
is cleared when you return to terminal mode.
Duplex mode
Type
D
to toggle between full- and half-duplex mode.
In half-duplex mode, your computer displays on the screen the
characters you type. In full-duplex mode, it does not. Most ser¬
vices and bulletin boards display both the characters they send
and the characters you type (send to them). Therefore, you must
use full-duplex mode with most systems. If you used half-duplex,
you'd see characters twice, once when the other system displays
them and once when your computer does. Use half-duplex for
direct "computer-to-computer" communications.
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