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TABLE 3- 3.
COMMANDS (CONT • D)
Command
Definition/Function
SSR. (Cont'd)
Detailed Status
Byte 1 (DSB1)
Tag 29
3-34
2 6
!!!!!.
Positioner Busy
(Cont'd)
Device
in
Standby
Device Seized
Device Reserved
Meaning
2. Stop with heads loaded (typ-
ically a power off sequence).
3.
Zero-length Seek Forward
Lower or Seek Reverse Lower
command.
4.
Seek
in
progress (not
On
Cylinder) •
S. Up for 10 milliseconds fol-
lOWing receipt of Start Po-
sitioner
In
or Start Posi-
tioner Out or, if one of
these is already set, R.e-turn
to
Centerline or Recliabrate.
When the Positioner Busy status
drops, DEN is retw:ned to the
controller ..
Drive is
in
Standby Mode, that
is, Unit Ready (First Seek to
On
Cylinder) is not available
yet.
Status is cleared by
Stop (Set Standby State or
press
S'r~
to extinguish
in-
dicator).
Drive has accepted a Seize
command and is reserved to
controller issuing the Summary
Status Request.
If drive is
single-port device, this sig-
nal is always available with-
out requiring a Seize command.
Drive has already been seized
by the other channel.
1. This is an input information command.
2. This command causes the drive to present a byte of data concern-
ing various drive error conditions.
These conditions are iden-
tified on the bidirectional data lines.
3. The FFls corresponding to the status bits are reset by the De-
tailed Status Byte 1 command, a Device Initialize signal or by
pushing the CHECK indicator/switch on the maintenance panel.
4. All errors identified in Detailed Status Byte 1 set Summary
Status Byte Bit 23 (DLI error).
5. The
bidi~ectional
data lines are interpreted as follows:
~
Data Parity Error
Meaning
On Output Information Trans-
fer Commands (DCO,DCl
=
00),
parity was not odd during
time that SWO is down while
SRI is up.
83318200
A
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