Internal Digital Modems
The digital modems on the PortMaster are numbered from M0 through M59 for a
maximum of 60 modems.
Modem slot 0 is allocated numbers M0 through M9, slot 1 is allocated numbers
M10 through M19, and so on, whether 8-port or 10-port modem cards are installed.
For example, modems on an 8-modem card installed in slot 1 are numbered M10
through M17.