📄 mbahp.cmd
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!
! HP BOOT COMMAND FILE - MASSBUS DISK
!
! THE MASSBUS TR LEVEL MUST BE DEPOSITED IN R1 AND THE
! UNIT NUMBER MUST BE DEPOSITED IN R3 BEFORE EXECUTING THIS PROCEDURE
!
HALT ! HALT PROCESSOR
UNJAM ! UNJAM SBI
INIT ! INIT PROCESSOR
DEPOSIT/I 11 20003800 ! SET UP SCBB
DEPOSIT R0 0 ! DISK PACK DEVICE TYPE
!R1 MUST BE PRESET TO THE DESIRED MBA TR LEVEL
DEPOSIT R2 0 ! ADAPTER UNIT = 0
!R3 MUST BE PRESET TO THE DESIRED UNIT NUMBER
DEPOSIT R4 0 ! BOOT BLOCK LBN (UNUSED)
DEPOSIT R5 1000B ! SOFTWARE BOOT FLAGS
DEPOSIT FP 0 ! SET NO MACHINE CHECK EXPECTED
START 20003000 ! START ROM PROGRAM
WAIT DONE ! WAIT FOR COMPLETION
!
EXAMINE SP ! SHOW ADDRESS OF WORKING MEMORY+^X200
LOAD VMB.EXE/START:@ ! LOAD PRIMARY BOOTSTRAP
START @ ! AND START IT
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