Ergo MD-21 User manual
I
3.
USER
SELECTABLE
STRAPS
//-SIQn"l
I
nte
....
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~,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 1m (3.3 feet), at 1
KG
terminator (For daisy chain connection,
the
cable length should be less than 1m)
(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
