After setting the RZ24's (two) from 0 and 1 to 1 and 2 
respectively. I have tried 'b dka100' and 'b /1 dka100', I am getting 
pretty much the same results:

>>> b /1 dka100
 -DKA100
howto 0x1, bdev 0x2a, booting...done.
(31448+22260) >> NetBSD/vax boot [980110 22:29] << 
: rom()netbsd 
changing rpb->unit from 100 to 1

83 BOOT SYS -DKA100 

howto 0x0, bdev 0x2a, booting...|/-\|/-\done.
(31448+22260) >> NetBSD/vax boot [980110 22:29] << 
: /netbsd 
sdopen:
ctlr=0 unit=0 part=1 sdstrategy(0,0): size=512 blk=0 nblk=1 scsi_tt_read:
ctlr 0, slave 0, len 512, blk 0, nblk 1 sc_rdwt: op 3, block 0, ram
107dd4, len 1, sc_adr 1, lun 0 
exec_scsi_low(0x10cfb0, 1)
sc_wait_bus_free() 
sc_select(1) 
SCSI: SELECT timeout 
sc_reset()
exec_scsi_low(0x10cfb0, 1) 
sc_wait_bus_free() 
sc_select(1) 
SCSI: SELECT timeout 
sc_reset() 
exec_scsi_low(0x10cfb0, 1) 
sc_wait_bus_free()
sc_select(1) 
SCSI: SELECT timeout 
sc_reset() 
exec_scsi_low(0x10cfb0, 1)
sc_wait_bus_free() 
sc_select(1) 
SCSI: SELECT timeout 
sc_reset()
exec_scsi_low(0x10cfb0, 1) 
sc_wait_bus_free() 
sc_select(1) 
SCSI: SELECT
timeout sc_reset() 
exec_scsi_low(0x10cfb0, 1) 
sc_wait_bus_free()
sc_select(1) 
SCSI: SELECT timeout 
sc_reset() 
SCSI READ, block 0 failed even after retries sd(0,0,1): 
block=0, error=0xfffffffe scsi_tt_read: ctlr
0, slave 0, len 512, blk 0, nblk 1 sc_rdwt: op 3, block 0, ram 107dd4, len
1, sc_adr 1, lun 0 

{loops ad nauseam} 

What is this?

P.S.A