Commodore 8250LP - VIII. INTERFACE; Motor On Signal and Control; Write Protect Switch Interface

D. Hotor On
This input, when activated to a logical zero level (open collector
with 1 K ohm pull up) will turn on the drive motor allowing
reading or writing on the drive. A 1 sec delay after activating
this line must be allowed before reading or writing. In general
when the drive is not selected, the motor should be off to extend
motor and diskette life and decrease pOlver consumption. System
timing must be analyzed to determine optimum delay bebieen
deselection of drive(s) and turning off motor(s).
Shown below is one of examples for motor control PCB ~hich should
resides on customer's PCB.
12V Pl-3
+MOTOR ON
5V
1
0-«
l.5k
Pl-5
. ~~(---
---------1[:>
7406
Fig. 7
E. Write Protect Switch Interface
TO DC MOTOR
CONTR.OL
Connector P1 provides the w~ITE PROTECT PHOTO DETECTOR.
5V
I
1
f
'
47k
..,../l 150 P1-20
~~~~i------<~(----~~
I o.l~F Pl-19 r
"-0 --_«
7414
TTT
Fig. 8
I
r------
I
I
I
I
L ______ _
L
OX DC ~!OTOR
COXTROL BOAD