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Tandy 1000 Technical Reference Manual

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Tandy 1000
(2)
SKA
method
Technical Reference Manual
(a)
Connect
the
SKA
referring
to
item
4-2-4
and
set
the
FO
PWR
switch
to
the
PSA
side.
(b)
Use
two
channels
of
oscilloscope
and
connect
them
as
follows:
i)
The
1st
channel:
SKA
DOUT
terminal
DC
mode,
SV,
lOmsec
ii)
The
2nd
channel:
PCBA
MFO
control
TPI
(Track
00
sensor),
IV
range
iii)
External
trigger:
DIRECTION SELECT
interface
signal
(Interface
connector
pin
No.lB)
or
Pin
3
of
J3
(resistor
network
RAI
for
terminator)
on
the
PCBA
MFO
control.
(+)
trigger.
(c)
Key
in
"BB
F".
(STEP
observation)
(d)
Start
the
spindle
motor
by
key
"5".
(MaN
indicator
turns
on).
(e)
Install
a
work
disk.
(f)
Execute
drive
select
by
key
"0".
(050
indicator
turns
on).
(g)
Set
the
step
rate
and
the
settling
time
as
follows
referring
to
item
4-2-4-3.
Step
rate
:
6msec
Settling
time
:
lSmsec
(h)
Key
in
"CO"
and
condirm
that
the
TRACK
indicator
becomes
"00".
(i)
Key
in
"CS".
(TOO
TIMING, SEEK
±S)
(j)
Measure
the
tA
and
tB
timings
according
to
Fig.427
and
confirm
the
-
407B
-

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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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