OPEN
OPEN
Open an I/O device for access.
Format
status = DISPATCH(OPEN,
device_str,
device_str_length);
Arguments
OPEN
OPEN function code (10
16
).
device_str
Virtual address of a device name string. This string is of the format of the boot_
dev environment variable:
"protocol tc_num tc_slot channel remote_address unit boot_dev_type ctrl_dev_type"
Where:
protocol SCSI, MOP, or BOOTP
tc_num 0
tc_slot TURBOchannel slot number
channel SCSI port A or B
remote_address 0 for disk , Ethernet address for network
unit ID and LUN for SCSI
boot_dev_type 0 = disk, 1 = tape, 2 = network
ctrl_dev_type Module type (for example, PMAZ, FLAM-IO...)
device_str_length
Length in bytes of the device string.
Description
This routine prepares an I/O device for use by the READ and WRITE routines.
The OPEN routine assigns a unique channel number to the device; no other
OPEN device has the same number. Two devices minimum can be open at one
time. Eight devices can be supported at one time. OPEN can be used to open
access to SCSI, Ethernet, FLASH ROM, and TURBOchannel devices on the DEC
3000 AXP.
16–62 Console
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