Table of Contents
Advertisement
Write data
If the write gate input is low, a low pulse on this input will write a bit of data on the disk.
Write gate
If this input is low, the write circuitry is enabled and data can be written to the disk via
the write data input.
Track 00
This is an output which is low when the read/write head is positioned on track 00 of
the disk.
Write protect
If a write protected disk is in the drive this output is low and the drive is unable to write
data.
Read data
When the drive is selected a low pulse is generated for each bit on the disk that is
detected.
Head select
This input selects the read/write head. If low, head 1 is selected, if high, head 0 is
selected.
Disk change
This output is low whenever a disk is removed from the drive. It remains low until a
disk is inserted, and the disk change reset signal has been received.
4.5
KEYBOARD
Introduction
The keyboard has 102-keys in the same layout as the IBM AT enhanced keyboard. It
provides the full range of QWERTY typewriter keys, special editing and function keys
and a number pad at the right hand side of the keyboard.
The following illustration shows the layout of the keys and the key legends on the UK
keyboard.
apricot
Esc
F1
F2
F3
F4
F5
F6
F7
F8
F9
_
!
£
$
%
^
&
*
(
)
5
8
1
2
3
4
6
7
9
0
-
I
{
Q
W
E
R
T
Y
U
O
P
[
:
K
L
A
S
D
F
G
H
J
@
Caps Lock
;
<
V
B
N
M
>
|
Z
X
C
?
,
.
\
/
Ctrl
Alt
Alt Gr
LS PRO HARDWARE TECHNICAL REFERENCE 4/19
Peripheral items
Print
Pause
Scroll
F10
F11
F12
Scrn
Lock
SysRq
Break
1
A
+
Num
Home
Page
/
-
Insert
*
=
Lock
Up
}
Page
7
8
9
Delete
End
]
Down
Home
Pg Up
+
~
5
4
6
#
'
1
2
3
End
Pg Dn
Enter
.
0
Ctri
Ins
Del
Advertisement
Chapters
Table of Contents
