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<B>Digital的Unix操作系统VAX 4.2源码</B>

!
! ULTRIX UNIBUS RA DISK COMMAND PROCEDURE
!
! THE UNIBUS TR LEVEL MUST BE DEPOSITED IN R1 AND THE
! UNIT NUMBER MUST BE DEPOSITED IN R3 BEFORE EXECUTING THIS PROCEDURE
!
SET SNAP ON		! Enable ERROR_HALT snapshots
SET FBOX OFF		! ULTRIX will turn on Fbox
INIT			! SRM processor init
UNJAM			! UNJAM SBIAs, Enable Master SBI interrupts
INIT/PAMM		! 
DEPOSIT CSWP 8		! Turn off the cache (ULTRIX turns the cache on)
!
DEPOSIT R0 11		! Device Type is UDA50
!R1 MUST BE PRESET TO THE DESIRED UBA TR LEVEL
DEPOSIT R2 0103F468	! Controller A (01) at Unibus CSR address 772150
!R3 MUST BE PRESET TO THE DESIRED UNIT NUMBER
DEPOSIT R4 0		! Logical block number to boot from if R5 bit 3 is set
DEPOSIT R5 1000B	! BOOT ULTRIX TO SINGLE USER AND PROMPT FOR IMAGENAME
DEPOSIT SP 200		! Set the stack pointer
LOAD/START:200 VMB	! Load VMB 200 bytes above the start of the good block
START 200 		! Start VMB at the load address