IBM MOBILE COMBO ADAPTER PRO/100 SP - Manual (Page 32)

S3 Command Line Termination Character (user defined)
This register determines the ASCII values as the carriage return character. This
character is used to end command lines and result codes.
Range: 0-127, ASCII decimal
Default: 13 (carriage return)
Units: ASCII
Note: This register value is not stored with &W command.
S4 Response Formatting Character (user defined)
This register determines the ASCII value used as the line feed character. The
modem uses a line feed character in command mode when it responds to the
computer.
Range: 0-127, ASCII decimal
Default: 10 (line feed)
Units: ASCII
Note: This register value is not stored with &W command.
S5 Command Line Editing Character (user defined)
This register sets the character recognized as a backspace and pertains to
asynchronous only. The modem will not recognize the backspace character if it
is set to a value that is greater than 32 ASCII. This character can be used to
edit a command line. When the echo command is enabled, the modem echoes
back to the local DTE the backspace character, an ASCII space character, and a
second backspace character. This means a total of three characters are
transmitted each time the modem processes the backspace character.
Range: 0-127, ASCII decimal
Default: 8 (backspace)
Units: ASCII
Note: This register value is not stored with &W command.
B-6 Intel
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PRO/100 SP Mobile Combo Adapter: User’s Guide