HEAD SELECT OPTIONS
Normally, a head is selected by the HEAD SELECT interface
line in a daisy chain system
of
up to four drives.
Head Select From DIRECTION Line.
This option allows both HEAD SELECT and DIRECTION
to
be
multiplexed on the same DIRECTION line.
By
cutting
trace
S2,
and jumpering trace
S1,
head selection is controlled by the
DIRECTION line. DIRECTION can
be
used in this way because
it
is not being used during
RIW
(STEP must accompany
DIREC-
TION
to
initiate
head movement).
This optional input, when activated
to
a low level, will turn
on
the activity
LED.
For uses and method, refer to Table below.
Logic
Option 1
Option 2
Option
IN
USE
(IN USE)=
(IN
USE)
=
(IN USE)=
IN
USE+
DS
INUSE+HL
(IN
USE)
INSTALLATION
Plug D
Plug D
Plug D
Unplug Z
Unplug Z
Plug
Y
Head
Select
From DRIVE SELECT Lines.
This option uses the existing DRIVE SELECT lines
to
address
up
to
two double sided drives. It selects up
to
four sides as
if
the sides were separate drives.
+ =
OR
logic function
DOOR LOCK LATCH OPTION
1.
Cut trace
S2,
and jumper trace
S3.
The sides are then
selected as follows:
With
this
option, the door lock actuator can
be
latched without
maintaining the
IN
USE
signal throughout the door lock inter-
val.
IN
USE
may
be
activated by DRIVE SELECT.
DRIVE
HEAD
DRIVE SELECT
input
NUMBER
SELECT
1
2
3 4
Traces
1
0
L
H
H
H
plug
DS1
1
1
H
L H
H
jumper
B2
2
0
H H
L H
plug
DS3
2
1
H
H
H
L
jumper
B4
1.
Plug trace
D.
2.
Plug trace
DL.
WRITE PROTECT OPTION
With this option installed, a Write Protected disk will not
in-
hibit writing but it will
be
reported
to
the controller.
1.
Cut trace
WP
and jumper trace
NP.
DISK CHANGE (Alternate Output)
RADIAL READY OPTIONS
L
low level, H
high level
A low active level on this option line indicates
that
the
READY
signal has gone false (door opened)
after
DRIVE SELECT went
false. The DISK CHANGE circuit is reset on the true to false
(Iow/high) transition
of
DRIVE SELECT provided that the drive
is
READY.
See the figure below.
Normally, the READY line from a drive is only available
to
the
interface when
it
is selected. This option enables the user to
monitor the READY line
of
each drive
on
the interface all the
time.
1.
Plug (jumper)
DC
False
Door
Open
Disk Change Timing
L
True
PRIVE SELECT 1
....
__
Tr_ue_
.....
~
nFalse
t
READY
~----:..._----
False I
II
~
~
Tru.
DISK CHANGE
----~....:...--:..
1.
Cut trace
RR.
2.
Unplug trace R and jumper the pad R to one
of
the
Alternate I/O pins.READY will then appear on the
chosen Alternate
I/O
pin.
RADIAL INDEX OPTIONS
Normally, the INDEX line from a drive is only available
to
the
interface when
it
is selected. This option enables the user to
monitor the INDEX line
of
each drive
on
the interface all the
time.
1.
Cut trace
RI.
2.
Unplug trace I and jumper pad I to one
of
the Alternate
I/O
pins.INDEX will then appear
on
the chosen Alternate
I/O
pin.
DISK 2 SENSE (Alternate output)
IN
USE
OPTIONS
Normally, the activity
LED
indicator will
be
turned on when
DRIVE SELECT is active. The door will
be
activated when
DRIVE SELECT and READY are active.
A LOW level on this line indicates that a two-sided diskette
is
in
use, and a HIGH level
on
this line indicates that a single-
sided diskette is in use.
1.
Plug trace 28.
11
(63 paginas)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comentarios a estos manuales