Tandy 1000 Technical Reference Manual

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Tandy 1000

Technical Reference Manual

improved

head

wear.

For

the

Fo-54

drives,

either

of

tunnel

erase

type

head

or

straddle

erase

type

head

is

used.

The

core

of

the

tunnel

erase

type

head

is

constructed

with

a

read/write

gap

which

is

used

for

data

write

and

data

read

operations

and

two

erase

gaps

which

are

used

to

erase

the

edges

of

the

recorded

track

immediately

after

the

recording

(tunnel

erase).

For

the

straddle

erase

type

head,

the

core

is

constructed

with

a

read/write

gap

and

two

erase

cores

for

erasing

the

edges

of

the

recorded

track

at

the

same

time

with

the

recording.

Even

though

the

core

construction

of

these

two

types

of

head

are

different,

their

functions

in

the

Fo-54

drives

are

the

same

and

have

complete

interchangeability

between

the

data

recorded

on

the

disks.

The

magnetic

head

and

the

carriage

on

which

the

head

is

mounted

form

the

most

important

part

of

the

FDD

and

is

specially

assembled

with

high

precision.

(5)

Head

seek

mechanism

The

head

seek

mechanism

consists

mainly

of

stepper

motor

with

a

capstan

(pooly),

steel

belt

(band),

guide

shafts,

and

carriage.

The

carriage

is

connected

to

the

capstan

of

the

stepping

motor

through

the

steel

belt

and

is

slided

along

the

guide

shafts.

The

flat

type

4-phase

stepping

motor

is

adopted

and

it

rotates

2

steps

(3.6°)

per

one

track

space.

The

stepper

motor

is

driven

in

a

unique

1-2

phase

driving

method

which

brought

a

success

in

reducing

the

heat

radiation

and

to

obtain

a

high

speed

driving

and

positioning

accuracy.

The

parrallelism

and

the

distance

between

the

shafts

and

the

center

line

of

the

disk,

and

shaft

and

disk

themselves

are

precisely

machined.

Also

the

thermal

expansion

of

the

chassis,

steel

belt,

carriage,

etc.

are

taken

into

consideration

in

the

process

of

design

so

that

they

are

mutually

offset

with

the

expansion

of

the

disk.

(6)

Detection

mechanisms

-

304

-

Table of Contents

Other manuals for Tandy 1000

User Guide337 pages

Programmer's Reference Guide251 pages

Basic Reference Manual411 pages

Owner's Manual46 pages

Questions and Answers:

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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

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