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Tandy 1000 Technical Reference Manual

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Tandy 1000
Rotation
starts
Disk
speed
Index
sensor
output
(TP4)
speed
detector
output
in
U2
Technical Reference Manual
Constant
speed
Pre-ready
latch
in
U2
Ready
latch
output
(U2,
pin
12)
READY
signal
600msec
Max.
800msec,Max.
Pre-ready
I
state
Ready
state
(Fig.309)
Ready
detector
waveforms
Stepping
motor
control
circuit
is
constructed
with
direction
latch,
internal
step
pulse
generator,
shift
register,
phase
drive
selector,
overdrive
timer,
etc.
Direction
latch
is
a
circuit
to
sample
and
hold
the
head
seek
direction
designated
by
the
DIRECTION
SELECT
signal
at
every
input
of
the
STEP
pulses.
The
internal
step
pulse
generator
is
constructed
with
a
counter
and
a
pulse
generator.
The
counter
is
triggered
at
the
trailing
edge
of
the
STEP
input
pulse,
and
the
second
internal
step
pulse
is
generated
with
a
delay
of
~msec,
approx.
from
each
STEP
input
pulse
by
the
pulse
generator.
It
makes
the
stepping
motor
rotate
for
2
steps
(3.6°)
in
response
to
one
STEP
input
pulse.
- 317 -

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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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