Name: Tandy 1000
Brand: Tandy
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Tandy 1000

3-3-1.

Function

Test

Points

Technical Reference Manual

Twelve

test

points

(two

for

ground)

are

equipped

the

PCBA

MFD

control

for

the

check

and

adjustment

the

FDD.

(1)

TPI

(Track

sensor)

Test

point

observe

the

output

the

track

detection

photo-

transistor

(shumitt

inverter

included).

well

TRACK

output

signal,

TPI

becomes

LOW

level

when

the

head

track

around

track

position.

TPI

(Track

sensor)

Track

02--i

(TTL

level)

~TraCk

(Fig.312)

Typical

waveform

TPI

Note:

The

TRACK

output

signal

goes

TRUE

(LOW

level)

only

when

the

phase

coil

the

stepper

motor

energized

and

the

direction

latch

set

the

step-out

direction

(refer

Fig.310).

Therefore,

the

level

change

timing

the

TRACK

signal

not

consistent

with

that

the

TPI

signal.

(2)

TP2

(Erase

gate)

Test

point

observe

the

output

the

erase

gate.

When

TP2

HIGH

level,

erase

current

flows

through

the

erase

head.

This

used

for

the

check

and

adjustment

the

required

delay

time

the

erase

gate

signal

against

the

WRITE

GATE

input

signal

when

the

tunnel

erase

head

used.

322

Other manuals for Tandy 1000

User Guide337 pages

Programmer's Reference Guide251 pages

Basic Reference Manual411 pages

Owner's Manual46 pages

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Tandy 1000 Specifications

General

Processor	Intel 8088
Processor Speed	4.77 MHz
RAM	128 KB (expandable to 640 KB)
Operating System	MS-DOS 2.11
Manufacturer	Tandy Corporation
Release Year	1984
Storage	Single or double 5.25" floppy disk drive (360 KB), optional hard drive
Sound	Tandy 3-voice sound
Ports	Parallel, Serial
Graphics	CGA (Color Graphics Adapter)
Graphics Modes	320x200, 640x200