device drivers Overview device drivers A device driver is a program that controls the action of one of the physical devices attached to your computer system. The following table lists the device drivers included with this edition of the COHERENT system. The first field gives the device's major device number; the second gives its name; and the third describes it. When a major device number has no driver as- sociated with it, that device is available for a driver yet to be written. 0: *mem Interface to memory 1: tty Primitive tty driver 2: kb/mm Keyboard and video 3: lp Parallel line printer 4: fl Floppy drive 5: al0 Serial line 0 (COM1 and COM3) 6: al1 Serial line 1 (COM2 and COM4) 7: hs Generic polled multi-port serial card 8: rm RAM disk 9: 10: 11: at AT hard disk 12: 13: scsi SCSI device driver 14: 15: 16: 17: 18: 19: 20: 21: 22: 23: sem System V compatible semaphores 24: shm System V subset shared memory 25: msg System V compatible messaging 26: 27: 28: 29: 30: 31: Also included are drivers for the following devices: console Console driver ct Controlling terminal driver null The ``bit bucket'' ***** See Also ***** at, boot, com, console, ct, fl, Lexicon, lp, mboot, mem, msg, null, scsi, sem, shm, tape, termio COHERENT Lexicon Page 1
device drivers Overview device drivers ***** Notes ***** See the Release Notes for your release of COHERENT for a list of supported devices and device drivers. The devices msg, sem, and shm are loadable drivers that can be loaded into memory using the command drvld. See their respective entries for more information. COHERENT Lexicon Page 2