() — Coherent 3.1.0


com4                      Device Driver                      com4




Device driver for asynchronous serial line COM4


/dev/com4  is   the  COHERENT  system's   standard  interface  to
asynchronous serial  line COM4.  The interface  is assigned major
device 6, and is accessed as a character-special device.  The I/O
address  for the  corresponding 8250 SIO  is 0x2E8  (COM4).  com4
generates interrupt IRQ3.

Four versions of device com4 are in directory /dev, as follows:


                                                     Modem
          Device Name  Major     Minor   I/O Type  Control?
          /dev/com4l      6        129   Interrupts    No
          /dev/com4r     6         1    Interrupts    Yes
          /dev/com4pl    6        193     Polled      No
          /dev/com4pr    6        65      Polled      Yes


For details on how these differ, see the entry for com.

***** Files *****

/dev/com4l -- Interrupt-driven, non-modem (local) line
/dev/com4r -- Interrupt-driven, modem (non-local) line
/dev/P
col
m4
le
pd
l,-πon-modem (local) line
/dev/com4pr -- Polled, modem (non-local) line

***** See Also *****

com, com2, stty
























COHERENT Lexicon                                           Page 1
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