List of
Contents
Page
INTRODUCTION
......... ...... ...... ............. .......... .............. 1
SERIALDATALINKCONTROLANDFORMAT
...... 2
KEYSWITCH
OPERATION
.......................................... 3
MICROSCREEN
OPERATION
..................................... 4
CLOCKOPERATION
.................................................... 6
MOUSEPORTOPERATION
........................................ 7
KEYBOARD FIRMWARE .............................................. 8
Keyboard
to
System
Unit
Character
Codes ................ 10
System
Unit
to
Keyboard
Character
Codes ................
11
List of
Illustrations
Figure
MicroScreen
Display
Codes
........................................... 1
Keyboard Codes
Used
by
the
BIOS ................................. 2
Keyboard
Constructional
Details
.................................. 3
INTRODUCTION
The
Apricot
Keyboard
is
rather
more
sophisticated
than
the
usual
computer
Keyboard. As
well
as
the
keyswitch
array
there
is
the
MicroScreen,
which
is
a
liquid
crystal
display
with
two
lines
of
forty
characters. A
battery
backed-up
time
and
date
chip, a
membrane
keypad
with
integral
LED's
and
a
port
to
connect
a
mouse
are all
incorporated
in
the
Keyboard. Later
sections
'of
this
chapter
describe
each
of
the
above areas
in
detail
and
also
outline
the
operation
of
the
Keyboard firmware.
The
central
element
in
the
Keyboard
is
the
processor
which
is
a single
chip
device,
type
number
6301.
This
device
has
4K
bytes
of code space, 128
bytes
of RAM, 29
parallel
bidirectional
I/O
lines, a 16
bit
timer,
and
a
UART
all
in
the
one
device
together
with
a
vectored
interrupt
controller
to
facilitate
the
use
of
these
facilities. As a
result
of
this
high
level of
integration
very
little
additional
logic
is
required
to
connect
the
peripheral
devices
to
the
processor.
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