Amstrad Emailer Pinouts
-----------------------

http://82.152.113.94/misc/Amstrad_Emailer_Pinouts.txt

2005-02-05 minor changes to LCD section

Keyboard Pinouts
----------------

Looking at top of keyboard, with the keys facing towards you. Pin 1 is 
leftmost.

PIN	SIGNAL	WIRE	
1 	GND 	black/shield	(connected to metal plate on keyboard)
2 	DATA 	green
3 	CLOCK 	red
4 	+5V 	blue		(3.3V works fine)

Notes
-----

* Standard PC keyboard protocol with non standard scan codes.
* When the bus is idle, clock and data lines are high.
* The data line should be sampled on the rising edge of the clock pulse.
* Data bytes are transmitted as follows:

  START=0
  D0
  D1
  D2
  D3
  D4
  D5
  D6
  D7
  PARITY (odd)
  STOP=1

* Works fine off a 3.3V supply - tested down to 2.4V.
* The keyboard has been successfully interfaced to a blackfin DSP using the
  Programmable Flag lines. Should work perfectly with PIC/AVR/805x as well.

For a much better explaination of the protocol visit the site below:
http://panda.cs.ndsu.nodak.edu/~achapwes/PICmicro/PS2/ps2.htm

Keyboard scan codes
-------------------

Key		Code (hex)
store		70
setup		7a
services	46
games		7c
internet	77
home		72
office		69
mobile		1a
text msg	2a
email		1c
fax		15
stop		71
1		74
2		73
3		6b
4		22
5		1b
6		1d
7		1e
8		79
9		7d
0		75
del		6c
q		21
w		23
e		24
r		26
t		52
y		5d
u		0d
i		0e
o		32
p		34
enter		2c
a		31
s		33
d		35
f		36
g		29
h		5b
j		03
k		76
l		3a
@		3b
lshift		3c
z		3d
x		4e
c		54
v		0b
b		05
n		41
m		42
?		43
up		3e
rshift		55
print		83
address book	06
symbol		49
space		4b
;		44
left		16
down		2e
right		09

Note that when a key is pressed, the scan code is sent as a single byte. When
the key is released it is transmitted as two bytes, first the prefix of 0xf0
followed by the scan code itself. 

LCD Pinouts
-----------

480x320 module manufactured by Densitron / Hitachi.

(left to right, face down view of display with connector towards you)
1 +3.3V
2 GND (note chassis is not connected to GND)
3 +3.3V
4 +VContrast (+20V - yes this is positive)
5 D0
6 D1
7 D2
8 D3
9 M
10 VSYNC (FLM???)
11 HSYNC (LP???)
12 CLOCK (~2MHz)

There may be a specific power up sequence required - if that is not followed
damage may occur due to latch-up. I would assume that the +3.3V supply must
be brought up before the 28V supply to prevent internal latch-up. I would
recommend inserting a 100R resistor in series wih the 3V3 supply and a 470R
resistor in series with the +20V supply to minimise the possibility of damage.
Since the display is a passive matrix type, it should not take more than 50mA
on any supply rail.

The inverter requires +28Vdc but can be modified to run from as low as 9Vdc.
To do this you will need to change the inductor and ground one side of the
transformer's secondary (the one without the series capacitor). For best 
results, ground the chassis of the display and swap the wires in the CCFL
molex connector.

(I have successfully tested the inverter with a 56uH inductor and it works
perfectly at 12V)

Note that the latest emailer revision (with the 'rubber' keys) uses a 
different type of inverter and it has not been tested yet.