Northern Telecom DMS-100 Series Maintenance Manual page 61

Procedure 4-13
Disk condition and disk file error messages - procedures
After a data track has been relocated:
D5 = seek prime
D8 = write standby
Formats:
Relocate track from prime; - used by backup:
L1 = read primeL2 = seek primeL3 = seek standby
L4 = write primeL5 = write standby
Assign disk parameters.:
PA = To A
Reads: RA = from A
From prime:
R1 = read prime = R2 = read standby (if read prime
failed)
Relocate track from standby (if standby succeeded)
R3 = read standby
seek standby
R6 = write prime
Backup track - used by backup:
T1 = seek prime
read prime
T4 = write standby
Writes: WA = T o A
To both when redundant:
W1 = seek prime W2 = seek standby W3 = write prime
W4 = write standby
Parameters = aa bb cc(1) cc(2) cc(3) dd(1) dd(2)
aa = quantity of sectors involved,
bb = drive unit number, (in Hex).
cc(1) cc(2) cc(3) = logical sector number, (in Hex).
dd(1) dd(2) = buffer address, (in Hex).
Side = z = indicates one of two redundant sides.
A = disk A
cause: printed when the SCSI (Small Computer System
Interface) bus handler of the DPP Disk Interface
is called to initiate a disk operation and a
previous SCSI bus cycle is still in progress.
(continued)
DPP Recovery and Routine Maintenance Guide BCS35 and up
Disk drive procedures 4-27
(continued)
D6 = seek standby D7 = write prime
FA = A FB = B
PB = To B RC = recalibrate
RB = from B
R4 = seek prime
R7 = write standby
T2 = seek standby
WB = To B
(in Hex).
B = disk B
R5 =
T3 =