CONTENTS
3.
THEORY
OF
OPERATION
3-1
Outline
of
construction
and
functions
••.••.....•..••..••••••••
3-1-1
Overall
block
diagram
......•..•.••.•.•.•..••....••....•••
3-1-2
Outline
of
mechanical
section
.••.....•.•.•.••...•••...•.•
3-2
Operation
of
data
recording/reproducing
system
(PCBA
Drive
Control)
..•••••••••.••••.•.••••.••.•••.•••••••••••
3-2-1
Read
circuit
..........................................•..
3-2-2
Write
circuit
and
erase
circuit
••••••.•••.•••.•••••••••••
3-3
Operaiton
of
tape
drive
systm
(PCBA
Drive
Control)
....••••..•.
3-3-1
Servo
circuit
•...•.••....•..•.•••.•••.•.••..••...••.•...•
3-3-2
Other
control
circuits
••..........•.....•••..•..•..••...•
3-4
"D/CAS"
Interface
control
(PCBA
Interface
Control)
...........
.
3-4-1
CPU
.•.•.•..••••..........•..••••..................•.•.•..
3-4-2
3-4-3
3-4-4
3-4-5
3-4-6
3-4-7
3-4-8
ROM
RAM
Host
interface
control
........•••..•••......••••••.....••
DMAC
Counter/timer
...........................................
.
Write/read
control
..•.•.....••..•.•••....•......•.....••.
I/O
port
.....•••.•..•.••••..•....•••••..•••.••.•..•..••••
301
301
304
311
311
315
317
317
319
321
322
323
323
324
328
329
330
334
3-5
"SCSI"
Interface
control
(PCBA
Interface
Control).............
335
3-5-1
CPU.
. . . . . . . . . . . . . • • • • . . • . . . . . . • . . • • • • • . . . • . • • . . . . . • • . • • • . 336
3-5-2
3-5-3
3-5-4
3-5-5
3-5-6
3-5-7
3-5-8
ROM
RAM
Host
interface
control
......••.•...........•..............
DMA.C
•••••••••••••••••••••••••••••••••••••••••••••••••••••
Counter/timer
..........•............•....•.......•••.•••.
Write/read
control
..••......•...•.•.•..•••.•.••.....••.•.
I/O
port
................••.............••.........••.....
337
337
338
344
345
346
350
3-6
"BASIC"
Interface
control
(PCBA
Interface
Control)............
351
3-6-1
Configuration
.........••.................•.........•.....
351
3-6-2
Theory
of
operation
...•.....•..........................••
354
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