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Tandy 1000 Technical Reference Manual

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Tandy 1000
(a)
File
protect
detection
mechanism
Technical Reference Manual
This
mechanism
is
constructed
with
an
LED
and
a
photo-transistor
to
detect
the
existence
of
the
write
enable
notch
of
the
disk
jacket.
When
a
disk
with
the
notch
covered
is
installed
and
the
light
pass
for
detection
is
disturbed,
no
write
or
erase
current
will
be
supplied
to
the
read/write
and
erase
heads
and
the
recorded
information
on
the
disk
is
protected
from
an
erroneous
input
of
a
write
command.
The
LED
is
mounted
on
the
PCBA
00
motor
servo
and
the
photo-transistor
on
the
front
OPT
Ass'y.
(b)
Track
00
detection
mechanism
This
mechanism
is
constructed
with
a
photo-interrupter
for
detecting
the
outermost
track
position
(track
00)
of
the
head
and
the
track
00
stopper
which
is
ataached
to
the
rear
side
of
the
head
carriage.
Inside
tracks
from
the
track
00
on
the
disk
are
used.
Even
if
an
erroneous
step
out
command
is
input
from
the
track
00
position,
the
command
will
be
ignored
by
the
internal
circuit
of
the
FOD.
If
the
head
moves
out
from
the
track
00
by
some
reason
(such
as
impact
during
transportation),
the
head
carriage
strikes
the
track
00
stopper
to
protect
the
head
from
moving
out
of
the
returnable
range
at
a
next
power
on.
When
step-in
commands
are
input
from
the
innermost
track,
the
head
seeks
toward
inward
and
stops
with
an
appropriate
space
left
against
the
head
window
edge
of
the
disk.
In
order
to
recalibrate
the
track
from
this
position
(returning
operation
to
the
track
00),
it
is
required
to
input
the
step-out
commands
with
several
additional
steps
to
the
maximum
track
number.
(c)
Index
detection
mechanism
LED
and
photo-transistor
for
the
detection
of
the
index
hole
are
-
305
-

Table of Contents

Other manuals for Tandy 1000

Preview: User Guide
User Guide337 pages
Preview: Programmer's Reference Guide
Programmer's Reference Guide251 pages
Preview: Basic Reference Manual
Basic Reference Manual411 pages
Preview: Owner's Manual
Owner's Manual46 pages

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Tandy 1000 Specifications

General IconGeneral
ProcessorIntel 8088
Processor Speed4.77 MHz
RAM128 KB (expandable to 640 KB)
Operating SystemMS-DOS 2.11
ManufacturerTandy Corporation
Release Year1984
StorageSingle or double 5.25" floppy disk drive (360 KB), optional hard drive
SoundTandy 3-voice sound
PortsParallel, Serial
GraphicsCGA (Color Graphics Adapter)
Graphics Modes320x200, 640x200

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