Figure 2.15 Transformer connections
FLEXIBLE D ISK D R IV ES
Integrated in the computer are one or two 5 1/4-inch flexible disk
drives to provide mass storage of programs and data for the com
puter. The drives contain read/write electronic controller elec
tronics, driver mechanics, read/write heads, and headpositioning
mechanism. The disk drive on the left is called A, the second drive
on the right side is called B. For maximum motor life, if no com
mands have been issued to the drives within 15 seconds after
completion of a previous command, the drive motor is turned off.
The head load mechanism is coupled with motor on signal.
Systems with an integrated fixed disk have only one flexible
disk drive, this is mounted on the rightmost side of the computer
and is called drive A.
Power requirements for the flexible disk drive are given in
Figure 2.16, and technical data in Figure 2.17.
Voltage Current Ripple
+ 5 V +5% Typical 0.5 A max. 0.8 A
<1 00 m Vpp
+12V +5% Typical 0.25 A max. OS A <2 00 m Vpp
Max. power dissipation: less than 10W.
Figure 2.16 Power requirements
2-24
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