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Teac MT-20D-IO - Page 63

Teac MT-20D-IO
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"BASIC"
3-6
Interface
control
(PCBA
Interface
Control)
3-6-1
Configuration
There
are
two
types
of
interface
controls;
one
is
of
a
discrete
type
(exclu-
sive
for
4
tracks)
and
the
other
is
of
a
LSI
type
(in
common
to
4
tracks
and
9
tracks).
The
discrete
type
interface
control
consists
of
individual
circuits
of
INITIAL
CONTROL,
MOTION
CONTROL,
TAPE
POSITION
MANAGEMENT.
RDP
CONVERTER.
CASSETTE
LOAD
DELAY.
TACH
PULSE
CONVERTER
(1/16)
and
CLOCK
GENERATOR.
etc
••
and
all
the
I/O
signals
are
of
TTL
level.
The LSI
type
interface
control
(PCBA
interface
control
P /N
1553207300.
applied
to
issue
D
onward)
is
a LSI
version
of
the
discrete
type
interface
control.
There
is
not
operational
difference
between
these
two
types
except
with
the
track
select
signal
added.
This
interface
control
consists
of
a
peripheral
circuit
and
driver/receiver.
etc
••
centering
around
the
interface
control
LSI
(hereinafter.
referred
to
as
LSI).
The
BASIC
I/F
side
input/
output
is
of
TTL
level.
and
the
DRIVE
I/F
side
input
is
of
TTL
level.
and
its
output
is
of
CMOS
level.
The
LSI
is
a
CMOS
type
Gate
Array.
in
which
almost
all
processings
required
for
interface
control
are
performed.
Fig.
329 shows
the
hardware
block
diagram
of
each
type
of
interface
control.
- 351 -

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