Minor Number Bit Assignments

The tables on the following pages show the bit assignments for bits 16 through 31 for the principal HP device drivers. In all cases, bits 8 through 15 (that is NN in hexadecimal 0xNN0000) encode the card instance of the interface card through which the device communicates.

Table C-2 Bit Assignments for Tape Devices

bits 16-19

20-23

24-27

28-31

stape tape2

SCSI target

SCSI LUN

24 - BSD behavior at close

25 - No rewind

26 - Configuration method ^[1]

27-31 - Index/Density ^[2]

tape1

HP-IB device

HP-IB unit

24 - BSD behavior at close

25 - No rewind

26 - Configuration method^[1]

27-31 - Index/Density^[2]

^[1]If 1, bits 27-31 mean Index. If 0, bits 27-31 mean Density.

^[2]Index and Density are generated as needed by mksf(1M). Density is encoded as a field in the minor number, using a constant of the form DEN_M_*, as defined in /usr/include/sys/mtio.h. Index refers to an index into the property table used to specify extended configuration options (using the mt_property_type data structure defined in /usr/include/sys/mtio.h.) For further discussion, see mt(7) in the HP-UX Reference.

Table C-3 Bit Assignments for Disk and agneto-Optical Devices

	bits 16-19	20-23	24-27	28-31
`disc1`	16 - Reserved (0) 17-19 - HP-IB address	CS80 unit	24 - Diagnostic access 25 - Cartridge tape 26-27 - Reserved	Section number (0=whole disk)
`disc2`	16 - Reserved 17-19 - HP-FL device	HP-FL unit (always 0)	24 - Diagnostic access 25-26 - Reserved	Section number
`disc3`	SCSI target	SCSI LUN	Reserved	Section number
`disc4`	SCSI target or HP-FL device	SCSI LUN or HP-FL unit (always 0)	Reserved	Section number
`sdisk`	SCSI target	SCSI LUN	Reserved	Disk partition number
`sflop`	SCSI target	SCSI LUN	Reserved	0=3.5in 1.44MB drive, geom determined (default) 1=3.5in 1.44MB drive, no geom determined (SoftPC) 2=3.5in 720KB drive, geom determined 3=3.5in 720KB drive, no geom determined 4=3.5in 2.88MB drive, geom determined 5=3.5in 2.88MB drive, no geom determined 6=not supported 7=not supported 8=5.25in 1.2MB drive, geom determined 8=5.25in 360KB drive, geom determined 9=5.25in 1.2MB drive, no geom determined 9=5.25in 360KB drive, no geom determined
`schgr` `autox0`	SCSI target	20-22 - SCSI LUN 23-31 - Surface

Table C-4 Bit Assignments for Serial, Network, and Line Printer Devices

	bits 16-19	20-23	24-27	28-31
`asio0`	16-17 - Receive fifo trigger level 18-19 - Transmit fifo limit	Reserved	24 - Card diagnostic bit 25 - Reserved 26 - Reserved 27 - Hardware flow control enable	28 - Reserved 29 - Protocol 0=Bell, 1=CCITT 30-31 - Access mode 00=Direct 01=Dial-out modem 10=Dial-in modem
`mux0` `mux2` `mux4`	16-23 - Port number		24 - Card diagnostic bit 25 - Port diagnostic bit 26 - Reserved 27 - Hardware flow control enable	28 - Reserved 29 - Protocol 0=Bell, 1=CCITT 30-31 - Access mode 00=Direct 01=Dial-out modem 10=Dial-in modem
`lan0` `lan1` `lan2` `lan3`	16-23 - Reserved		24 - Diagnostic access 25-30 - Reserved 31 - Protocol 1=IEEE, 2=Ethernet
`osi0`	16-31 - Reserved
`CentIf`	16-27 - Reserved			Handshake mode: 1=Automatic, using ACK, BUSY 2=Automatic, using BUSY only 3=Bidirectional read/write (for ScanJet) 4=Stream mode 5=Pulsed mode, using ACK, BUSY 6=Pulsed mode, using BUSY only
`lpr0` `lpr1` `lpr2` `lpr3`	HP-IB device or SCSI target	HP-IB unit or SCSI LUN	24 - Diagnostic access 25 - Reserved 26 - Auto form feed 27 - Case fold	28 - Raw mode 29 - No wait 30 - Old paper-out behavior 31 - Eject page during paper-out recovery
`hpib`	HP-IB device	Unused	Unused	Unused

Table C-5 Bit Assignments for Miscellaneous Devices

	bits 16-19	20-23	24-27	28-31
`sctl`	SCSI target	SCSI LUN	Reserved	0=Select with ATN enabled (default) 1=Select with ATN controlled by `scsi_cmd_parms` ^[1] 2=Inhibit inquiry at open >2 - Not supported
`instr0`	16-20 - Instrument address 21-23 - Reserved		24 - Diagnostic access 25-31 - Reserved
`pty0` `pty1`	Bits 8-31 - Unique hex value for `pty`
`pdn0`	Bits 16-23=2 (type)		24 - Diagnostic bit 25-31 - unused
`psi0` `psi1`	16-23 - Reserved		24 - diagnostic 25-31(`psi0`) - Reserved 25-31(`psi1`) - PDA Index
`graph3`	16-23 - Bus specifier		Unused	0=Image planes 1=Overlay planes
`ps2`	`b` (hexadecimal) ^[2]	Reserved	Port number	28 - Autosearch 0=Off, 1=On. If 28 is On, 29 used as follows: 0=Mouse 1=Keyboard 30-31=0
`audio`	Instance Number	0=Read/write device 1=control only device	Output destination (Ignored if bits 28-31=0.) 0=Headphone, internal speaker, line out for Audio II 1=Headphone only 2=Int. speaker only 3=No output 4=Line output only (Audio II)	Output format (Ignored if bits 20-23=1) 0=No change 1=Mu-law 2=A-law 3=16-bit linear
^[1]See `/usr/include/sys/scsi.h`. ^[2]Corresponds to bits `1011`, for the function number of the PS2 device.

Minor Number Bit Assignments

Technical documentation

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