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Teac MT-20D-IO - Page 34

Teac MT-20D-IO
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3-4-1
CPU
The
microprocessor
80C85A
is
used
as
the
CPU.
The
CPU
controls
the
opera-
tion
of
each
LSI
within
MTC.
It
also
controls
directly
controls
the
moving
system
and
write
system
signals
GO,
FWD,
HIS
WEN,
and
EEN,
etc.
with
respect
to
GMT
via
the
output
port,
or
monitors
the
ouptut
signals
CLD,
FPT,
and
HOL,
etc.
from
GMT
via
the
input
port
and
feeds
them
back
to
the
tape
motion
control.
While,
as
for
the
data
system,
the
CPU
generates
a
data
block
by
adding
a
header
(such
as
track
No.
and
block
address)
to
the
data
received
from
the
HOST
during
write
operation,
or
generates
File
Mark
Write,
and
control
block,
and
controls
Rewrite,
etc.
during
error
occurrence.
During
read
operation,
it
also
checks
the
header,
and
identifies
the
data
block,
file
mark
block
and
control
block,
and
then
transfers
only
the
data
part
of
the
data
block
to
the
HOST.
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