SYSTEM TECHNICAL MANUAL HARDWARE DESCRIPTION
Read Data
Output signal containing the “Raw Data” (clock and data to
gether) as detected by the drive electronics. The Read Data
signals are composite clock and data pulses of 1 microsecond,
+ 250 nanoseconds.
In Use
Active low input signal indicates that all of the daisy changed
FDDs are under the control, of the system, and the indicator
on the front panel is on. (not used)
Ready
Active low output signal indicates that the FDD is in ready
state; it is satisfied when the FDD is powered on, the disk is
installed, the disk rotates at nominal speed, and two Index
pulses have been counted after disk starts rotation. Required
time for this signal to become true after the Motor On signal
becomes true is less than 800 ms.
FIXED (WINCHESTER) DISK
The Winchester disk drive uses two non-removable 5 1/4-inch disks
as storage media. The total fomatted capacity of the four surfaces
is 10 Mbytes. The two disks are called disk B and disk C. The
Western Digital Winchester disk controller interfaces the disk
drive to the host processor. All necessary buffers and receivers/
drivers are included on the Winchester disk controller board to
allow direct connection to the drive. Between the disk controller
board and main controller board, a small interface board for bus
adaption is included.
Power requirements for the fixed disk drive are given in Figure
2.19, and technical data in Figure 2.20.
Voltage
Current Ripple
+12V ±5%
+ 5V ±5%
1.6 A typica l, 3.5 A max.
1.1 A typ ica l, 1.7 A max.
>50m V pp
> 5 0m V p p
Figure 2.19 Power requirements
2-27
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