Multitech Systems MULTIMODEM ISI3334/4 Hardwareinstallationshandbuch Seite 103

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ttyl
BASENAME
This prefix is applied to all
MultiModemISI ports on all boards.
Base names are 1-4 characters
b
BOARD NUMBER
Values of 1 through 4,
depending on the number
of MultiModemISIs installed.
x
PORT LETTER
Values of A-H for MultiModemISI ports.
(SCO UNIX/XENIX values
A-H indicate modem ports.)