HP C2233 Product Description Manual page 29

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Unit Attention
Synchronous Data
Transfer Request
(SDTR)
Parity Option Setting
Auto Spin Up Option
. When pin-set 1 is open, the Unit Attention function is
enabled. When shorted, it is disabled.
When pin-set 2 is shorted the drive will initiate an SDTR
message at power on and RESET. When open, the drive
will not initiate an SDTR message. The drive will respond
to a host-initiated SDTR message whether this pin-set is
open or shorted.
When pin-set 3 is shorted, the disk drive checks parity on
commands and data. When open, the disk drive does not
check for parity. Parity bits are generated whether this
pin-set is open or shorted.
When pin-set 4 is shorted, the disk drive will automatically
spin up at power on. If open, the drive will not spin up
until the Intiator sends a Start Unit command. When not
in the auto spin up mode the drive will return "Not Ready"
to all commands except REQUEST SENSE, INQUIRY,
RESERVE, RELEASE, and START UNIT until the drive is
ready for access.
Synchronized Spindle
There are three configurations of the synchronized spindle
function: Slave, Master, and Master Control. The HP
C2233/34/35 disk drives support the Slave and Master
configurations, but not the Master Control configuration.
The power-on default for all drives disables Synchronized
Spindles. The Synchronized Spindle function is not
DRAFT
10/24/90 12:38
saved during power cycles or drive resets and must be
re-configured with the MODE SENSE command after these
events. Refer to figure 2-5 and table 2-1 for the location
and identification of the Synchronized Spindle pins and the
signal specifications.
Slave. When the drive is set to the Slave configuration (by
the MODE SENSE command):
Product Installation 2-7