Ergo MD-21 User Manual

I
3. USER SELECTABLE STRAPS
/ / - S I Q n " l
I nte .... ("ce connecto....
-o"k_-,
~,v
'i
- ---I,
. 1
~:'
...
~..
II
r.
I,
~
llfl
(wppe c
o
~m
LJ>..
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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,