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7901A
LEVEL
o
2
3
4
7901-23
CONTENTS
1 CONTROLLER
AUXILIARY
FUNCTION
Theory of Operation
CONTROLLER
p------ ----,
: LINE TERMINATION
I
L---r------------r----------~------------~----~
ON LAST DISC
,
4 PARALLELED
DISC DRIVES
PER CONTROLLER
DISC
DRIVE 0
DISC
DRIVE 1
DISC
DRIVE 2
t:::======C>
CYLINDER 202
--------------.1
CYLINDE R
t6 --------.,
'
203 CYLINDERS
PER DRIVE
CARRIAGE
2 HEADS
PER DRIVE
~========~~
HEAD NUMBER
24 SECTORS
PER TRACK
NOTE:
A TRACK IS SELECTED WHEN
A CYLINDER AND A HEAD
ARE SELECTED.
o
Figure 4-2. Disc Drive Addressing Structure
DISC
DRIVE 3
I
DRIVE
I
L _________
~
,
4·3
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