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CP/M 3 User's Guide 3.5 Assigning Logical Devices
3.5 Assigning Logical Devices
Most CP/M 3 computer systems have a traditional console with a keyboard and
screen display. Many also have letter-quality printers. If you use your computer for
unusual tasks, you might want to add a different kind of character device to your
system: a line printer, a teletype terminal, a modem, or even a joystick for playing
games. To keep track of these physically different input and output devices, CP/M 3
associates different physical devices with logical devices. Table 3-3 gives the names
of CP/M 3 logical devices. It also shows the physical devices assigned to these logical
devices in the distributed CP/M 3 system.
Table 3-3. CP/M 3 Logical Devices
Logical Physical Device
Device Name Device Type Assignment
CONIN: Console input Keyboard
CONOUT: Console output Screen
AUXIN: Auxiliary input Null
AUXOUT: Auxiliary output Null
LST: List output Printer
In some implementations of CP/M 3, you can change these assignments with a
DEVICE command. If your system supports the DEVICE command, you can, for
example, assign AUXIN and AUXOLTT to a modem so that your computer can
communicate with others over the telephone.
End of Section 3
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