IBM 0663 Series Manual page 10

phased out in favor of the functionally equivalent
7 disk version PN 55F9813. Current users of the
8 disk drive should evaluate the 7 disk version
to ensure compatibility with their application(s)
before receiving quantity shipments. New integrators
should evaluate the 7 disk version.
NB: This drive is not suitable for attachment to
'Apple' systems as it does not support the 'Blind
Write' and 'Unit Attention Disable' features used by
the majority of these systems.
PN 0663 H12 8 disk version of H12 (1 GB) drive with fast (9.8 mSec)
actuator. Preferred where high seek performance is of
more importance than low power dissipation. Production
of this drive has been phased out in favor of the
functionally equivalent 7 disk version PN 55F9819.
Current users of the 8 disk drive should evaluate
7 disk version to ensure compatibility with their
application(s) before receiving quantity shipments.
New integrators should evaluate the 7 disk version.
NB: This drive is not suitable for attachment to
'Apple' systems as it does not support the 'Blind
Write' and 'Unit Attention Disable' features used by
the majority of these systems.
DC POWER REQUIREMENT LIMITS
The following voltage specifications apply at the file voltage connector, there are no special
power on/off sequencing requirements.
+12 Volt Supply
+/- 5.0% (during run)
-7.0% +5.0% (during start)
+5 Volt Supply
+/- 5.0%
Power supply current (Amps) - Population mean
Idle average
Seek peak (H11, H12)
(L11, L12)
(H11, H12)
(L11, L12)
Commutation
Note 1: The idle average, communication and seek peak should be added together to determine
the total 12 volt peak current.
+5 Volt +12 Volt
1.07 0.49
-- 1.84 (see note 1)
-- 0.78 Spin-up
-- 3.75 (see note 2)
-- 3.59
-- 0.35