Ergo MD-21 User Manual

I

3.

USER

SELECTABLE

STRAPS

//-SIQn"l

I

nte

....

("ce

connecto

....

-o"k_-,

~,v

'i

-

---I,

.1

~:'

...

~..

II

r.

I,

~

llfl

(wppe

c

o

~m

LJ>..

",I

I~"=--=y

r

COb

'e

Figure 2 Singal interface connector external view

The FDD

Is

eqUipped with the following selectable straps on the main

peBA

Insertion of a short

bar

onto

the post pin

Is

defined as the on·state of the strap

HOO

u

HOL

"n

uu

r

HOH

L

r

L

01

r c

DO

~~

..

J

Figure 3

3.1

DO

and

01

Straps

(b)

3.2 HDH, HOL, Dl ancl HOC Straps

(a) Table 3 shows the combinatIOn of the straps Four deSignating methods are offered for

selection

(1)

Selection

No

1

The

FOO

switches the density mode according

to

the

HD

IN

input signal from the host

HIGH level corresponds to high density mode.

HO

IN

input Signal from the host

controller

(3)

Selection No.3
The FDD switches the density mode automatically by detecting the eXistence of the HD
hole

01

the Inserted diskette

(4)

SelectIOn

N04

The host controller sWitches to the

HD

OUT output signal

from

theFDD

Ob

DenSity mode designation

Selection

2

No,

Host

Side

I FOO

Key·in

or

software

HD

IN

from

v.",

host

Side

ON

HD

IN

KeY·1n

or

software

HD

IN

_."

from

(LOW HD) host

Side

ON

OPEN

Key·in

or

software I AutomatiC by HD

hole sensor
Automatic by HD

ON I ON

I

~G~U~D) I~~mO~~Dslgnal

hole sensor

Note

mark indicates off-state of the strap

Never set any strap combmatlons other than the above

Tabte 3 Function selection for Interface pin No 2

ERGO MD-21

MICRO

FLOPPY

DISK

DRIVE

USER MANUAL

REV

2.1

Copyright

1991 by Ergo System International Company Ltd,

-----

2.

Signal Interlace Connector

and

Cable

(1)

Signal interface

connector

1. Power Interface Connector and Cable

(a)

Pin numbers and pin pitch

254

mm

(0.1

in)

pitch,

34

pins block header

(17

pins double

rows, even

number

pins are upper side

of

the FDDl

(1)

Power interface connector

(b) Connector external view

See Fig.2

I;

{~~;

C,'

(c)

Interface connection

See Table 2

(a)

pin numbers : 4 pins

I~~

c~· --~

PCB

(b)

Connector external

view:

See Fig.

1.

R",,,,r

v I

e"

(2)

Signal intertace cable

(c)

Power interface connections

See

Table

1.

Maximum cable length 1 m (3.3 feet), at 1

KG

terminator (For daisy chain connection,

the

cable length should be less than 1 m)

(2)

Power interface cable

IPin Nos.

Ei~1

Pins nos ISingals I

Directions

I

--D

I,

'I

w

II

HD

IN/OPEN/HD

OUT

IN/OUT

Any appropriate cables capable of taking the

w

OPEN

maximum power consumption of the

FDD

will

w

RESERVED

INPUT

w

INDEX

OUTPUT

be acceptable.

Il~"II'

w

DRIVE SELECT 0

INPUT

w

DRIVE SELECT 1

INPUT

"

W

RESERVED

INPUT

Power voltage Pin numbers

15

W

16

MOTOR

ON

INPUT

W W 18 DIRECTION SELECT INPUT

I

W

STEP

INPUT

W

WRITE DATA INPUT

DC +5V

1

I I

111

,

I]

1m

1 I

II

D W

WRITE GATE INPUT

OV

2

I

II

W

26

TRACK 00 OUTPUT

•

W

28 WRITE PROTECT OUTPUT

(OV)

3

W READ DATA OUTPUT
W

SIDE

ONE

SELECT INPUT

ll.~

•

I

,~

I~

-

(No connection)

4

~

W 34

DISK

CHANGE

OUTPUT

~\

Note

Refer to

Item

11

2 as

10

Ihe

output

sIgnal selectIon

of

pm No 2

Table 2 Signal interface pin-assignment

Table 1

DC

Power Connector pin-assignment

Figure 1 Power interface

connector

external

view