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2.9
511" WINCHESTER PISK PRIVE SUBSYSTEM
GENERAL PESCRIPTION
The disk subsystem consists of the controller, up to 4 disk units, a disk
interface card for each disk unit, together with power and control cables, as
shown below:
S100
BUS
INTER-
+---.1JI
CONTROLLER
FACE
DISK UNIT #0
CARD
POWER
1
I
I
.,[,
I
,
INTER-
DISK UNIT #3
FACE
CARD
The function of the controller is to transfer data between the bus and the disk
units.
The interface card provides sector signals to the controller and also
decodes the drive select signals.
DISK PRIVE
The disk unit is a 51A inch Winchester Technology sealed fixed disk drive with
typical specifications as follows:
Environment:
Ambient Temperature
Relative Humidi ty
10% to 80% (non-condensing)
Power:
Unformatted
Capacity:
Transfer Rate:
Access Time:
+12VDC 1.10%, 2A typical, (4A during motor start)
+5VDC
±.5
%, 0.65A typical
10.4 kilobytes per track
5.0 Megabits per second
18 milliseconds track to track seek (including
settling time)
90 milliseconds average seek
215 milliseconds maximum seek
8.3 milliseconds average rotational latency
IMS International
5000 Series Microcomputer s/7.0 1.83;P age 79
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