Commodore 8250LP - VIII. INTERFACE; Frame Grounding; Power Interface Requirements

H. Frame Ground
The drive frame must be grounded. If drive is incorporated into
a batte.:-y powered portable system, then D.C. ground is recomm:;n-
ded. If system's input power is line voltage, then the third
wire SAFETY GROUND is recommended. A~W PIN 61761-2 AC or DC
power input ground and mating connector A~W PIN 60972-1.
I. Power Interface
Diskette Storage Drive requires DC power for operation. Th:; t~,.o
required voltages are as follows:
(1) +5.00 ± 0.25 VDC @ 0.2A typical
(2) +12.0 _ 0.6 VDC @ 1.2A max., .75A typical, 100 mv max
allowable p-p ripple
Hotor start surge (see below)
The 12V current is composed of tw·o components; diskett:;
drive motor current and read/write steppe.:- functions.
Also the diskette drive motor is energized and deenergized
by the "}Olotor On" or "Drive Select" interface line.
Each of these functions has the following contributions
to the +12V current requirements.
(1) Read~vrite function and stepper motor
(driv-e "standbyJl cur.:-ent)
+5V current is 1.0A typical 0.3A max.
(B) Diskette drive motor start
+12V current is 1.0A typical, 1.2A max. for 1 sec max.
(C) Diskette drive motor running
+12V current is .2SA typical, O.9A max.
(motor stalled)
( 17)