CRL(4) BSD/vax Kernel Interfaces Manual CRL(4)NAMEcrl — VAX 8600 console RL02 interface
This is a simple interface to the DEC RL02 disk unit which is part of the
console subsystem on the VAX 8600 and 8650. Access is given to the
entire RL02 disk; the pack format is the same as that of RL02 disks on
other controllers. As on other VAX console media, transfers are done a
word at a time using privileged registers (i.e., slowly).
All I/O is raw; the seek addresses in raw transfers should be a multiple
of 512 bytes and a multiple of 512 bytes should be transferred, as in
other “raw” disk interfaces. (Although the sector size is actually 256
bytes, the driver allows operations only on 512-byte boundaries.)
The crl driver appeared in 4.3BSD.
4.3 Berkeley Distribution June 5, 1993 4.3 Berkeley Distribution