CASIO DC-E700 and DC-E800
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(Warning: it's an old text I ahve found on my MC600 laptop)

As I  have mentioned  before I  have got a  CASIO databank  device. The
DC-E700 is somewhat special as it has a size of a credit card and it is
very thin (specs  say that it is  1.4mm thick). It is  powered by solar
energy. A similar  device exists (the DC-E800). It  is identical except
the orientation:  the 700  model has screen  and keyboard  in landscape
orientation and the 800 one in portrait. In the text below I will refer
to the 700 one but the 800 works in the same manner.

It has a keyboard so data can be  searched and it can be also used as a
simple calculator (for "+", "-", "*"  and "/" operations). All data are
written to the EEPROM and the solar panel doesn't provide enough energy
to re-write it. Thus no data can be saved when the device is powered by
solar energy only.

Additional power can be provided by  a small dock which houses a CR2025
battery. The  dock is  tiny, of course,  but still it  is at  least four
times thicker than the databank itself and its footprint is bigger, too
and thus the  device with a dock  does not fit to  pockets designed for
credit cards.

The data  which can be  stored are very limited  there can be  an owner
name (the 800  model also allows to store owner's  phone number but the
700 one does not)  and 300 pairs of owner name and  phone number. It is
not possible to  add more data to  a single name. And  the phone number
can only include  numbers, not letters. The data can  be protected by a
password.

All  this sounds  to be  very  limiting but  I actually  have found  it
useful. I can carry the databank in  my wallet as it is only marginally
thicker than  any of my  shopping cards.  It stores the  most important
phone numbers for the case that I will not have my phone with me (which
is my common habit) and will have  to call someone. It also can be used
as a simple calculator (typing on  its tiny keyboard is not comfortable
but it's better than nothing). For such  use I don't need to be able to
write data when I'm not at home so  I don't need to carry the dock with
me.

It might sound as a strange concept put the principle is similar to the
(later) Franklin/Xircom  REX organisers:  data can  be written  at home
(when the REX was inserted in the computer's PCMCIA slot) and then used
in read-only mode (of course the REX  was some ability to edit the data
but it was pretty limited - only the latest model had a touchscreen and
a stylus to enter the data). But the REX (which is very small as it has
o fit  inside the  PCMCIA slot)  is bulky and  ugly when  compared with
these CASIOs...

These devices seem to have problems  with LCD screen leakages. I have 6
of them  (both 700 and 800  models) and only  of 2 of them  have intact
screens. All  of them  can be  used anyway but  the screens  with black
leaks are of  course ugly. And all  of them came as  never used devices
with their original packaging...

It is also weird that I am not able to find how old they are. I was not
able to find any date on the  Internet and the device itself carries no
date information (even  the documentation does not refer  to any date).
On the basis of  model numbers I assume that they  are from early 1990s
(the timespan of 1993-1994 seems to be the most probable). But I can be
mistaken.

Anyone know more about these devices?