
The
Tummy PC: A Practical Wearable
Computer (How to Make Your Own)
© 2005-2009 by John M. Smart
(This article may be
excerpted or reproduced in its entirety for noncommercial purposes.)
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The Tummy
PC is my name for a lightweight, wearable personal computer worn at the
waist like a "tummy pack," with a near full-sized touch typable
keyboard and fabric covering the case when closed, so it looks unobtrusive.
This is a very, very productive and useful form factor that I hope to
see much more of in coming years.
Tummy
PC 1.0 (1998-2005):
NEC MobilePro HPC
My
Tummy PC Version 1.0 was a 1.8 lb, J-class clamshell handheld personal
computer (HPC) made by NEC. I began wearing it in 1998, with the debut
of the MobilePro 750. When the clamshell is open, the HPC screen sits
out about 4" from the waistline of the wearer (see picture right),
for comfortable touchscreen navigation. The 95% size keyboard is comfortable
for fast touch typing. When closed, the fabric case cover makes the HPC
look like a tummy pack (second picture below). My case cover includes
a pouch for a second battery, which is always helpful on the road.
This
article tells you how to make your own Tummy PC using NEC
MobilePro HPC (picture left). This was an amazingly useful notetaking
machine for the seven years I used it, and it was a very sad day when
NEC stopped producing them in 2004. The MobilePro
900C was the last and best of the bunch.
I'm
really looking forward to someone hacking the iPhone into this amazing
form factor. An iPhone-based Tummy PC could be the world's first truly
useful and practical mass-market (my solution is home-grown)
wearable computer. Can we expect this in 2010?
The "instant
on" feature of the MobilePro allows your Tummy PC to be on and ready
as soon as you open it on your belt. NEC's elegant, near-full sized keyboard
allows you to easily type 50-80 words a minute either sitting or standing,
fast enough to catch all but the most rapid conversations verbatim. The
touchscreen gives you an intuitive interface for your HPC apps, and adding
a Socket
CF Wi-Fi Card allows you to waist-browse the web. For
more on the NEC MobilePro visit Rich Hawley's great MobilePro
900C compatibility site. You might also look at other HPC sites, like
John Ottini's HPC
Factor. The best place for help from other MobilePro users and experts
is probably PocketPC's NEC
MobilePro Forum.
By 2004,
the only company still making J-class (HPC) wearables was NEC. They outlasted
HP's Journada, a less advanced entry in this class. HPCs may still be
sold in Japan, but are now defunct in the US. This is a shame, as NEC
did a good business selling them to vertical markets including salespeople
and health care workers. They ran only Windows CE, but clearly it is just
a matter of time until someone ports OS X and Windows XP into this form
factor.
Because
I write a lot and like to review and prioritize my agenda, I would guess
my TummyPC roughly doubled my note-taking productivity over the seven
years I used it, primarily because the HPC is instant-on and always accessible
when I'm wearing it. If you wear a belt, I find it best to wear the buckle
to one side (picture right) or go beltless. With either of the two mounting
options below you will find you can safely run (for planes, to class,
etc.) while wearing your HPC (with cellphone clips mounted to the back).
You won't even need to take your Tummy PC off when you drive, as you can
strap your seatbelt right under it. Thus it is a true wearable computer.
For everyone's safety, please don't use it while you drive!
Because
of the Mobile Pro's energy-efficient solid state design (no hard drive),
with fresh regular-size MC-BA9 batteries (available at places like http://www.Gementerprises.com
for about $15 each) you'll get 5.5 hours of use out of each (or as little
as 3.5 if you are constantly using Wi-Fi), for seven to eleven hours of
cord-free use. I recommend keeping an extra AC adapter in your car and
one in your backpack for emergency recharges. After several months of
daily use your batteries start to degrade in performance. Buy two replacement
batteries on eBay every eight months (put it in your calendar) and you'll
always be powered up.
Professionals who
are mobile much of the day can greatly benefit from a Tummy PC. So can
students, who will find this an ideal notetaker. Finally I'd recommend
it for writers, who will find it very easy to input interesting thoughts
wherever and whenever they occur. This is much better than speaking it
into a voice recorder, as you can edit and reorganize your thoughts as
they happen.
 
Would you like to
make your own wearable HPC? Just follow the three
step directions at the bottom of this article.
Ultraportable
PC (2005-2009): Sony VAIO TX Series
In
2005 Sony introduced a full-featured ultraportable laptop, the VAIO
VGN-TX17GP. At 2.7 pounds and with a small form factor (10.7”
wide x 7.7" deep x 1.12” high) it isn't wearable like the NEC
HPC, but it runs Windows XP and is a full featured laptop with a DVD burner.
When this machine came out I decided to move to it while waiting for another
great J-class HPC like my Tummy PC. I've been waiting five years, but
hopefully it won't be that much longer.
Besides serious miniaturization,
the TX's major innovation is its screen. It has a wide, high resolution,
11.1" WXGA (1366x768) LCD display, and most interestingly, white
organic LED (the "light
source of the future") as a next generation backlight, instead
of the typical CCFLs (cold cathode flourescent lamps). This makes the
screen bright (though nothing like OLED, which is coming) and amazingly
thin and light, and more than twice as energy efficient as the CCFL technology.
The efficient screen significantly increases the battery life of the laptop,
giving it a real-world four to five hours (six to nine if you buy the
extended battery).
Once
you've made this portability investment you'll
want something like the Verizon
BroadbandAccess Cellular Modem Card to give you broadband
access to the web wherever you can get a cell signal. The
cellular broadband even works in a car driving at 60 miles an hour (with
you as passenger, I hope). That makes it either Star Trek technology
or the minimum requirement for 21st century living, depending on your
attitude with regard to these things. Sony
has a reputation for being overly aggressive with their digital rights
management tools (eg., their recent rootkit
fiasco). But if you believe they will ultimately play fair when challenged,
as I do, you may be willing to support their innovation by buying their
products.
I currently carry
my TX-17 in a small backpack when I leave the house, so I'm using it as
an ultraportable rather than a wearable. Using it in sleep mode makes
it more accessible, but still nothing like an "instant on" device.
Pulling it from my backpack it will boot up from sleep 5-10 seconds after
you open the lid and touch any key, so it is still usable for catching
quick notes (though in practice I scribble on paper again, as this is
still a very significant delay). It sleeps automatically 15 seconds after
you close the lid. Again, this is a major downgrade from the wearable
accessibility of my HPC, so I'm looking forward to someone bringing
back my Tummy PC, the instant-on HPC form factor, wearable
at the waist. It is now 2009, and I've been waiting five years.
Fortunately, I can see a hack that will solve this problem Real Soon Now
(read on!).
Tummy
PC 2.0 (2010?): Largescreen iPhone w/ Keyboard, Stuffed into a MobilePro
Body!
The iPhone's
multi-touch user experience is without parallel, but until it has both
an external keyboard, and a double width screen,
large enough to read regular-sized web pages without shrinking them from
native resolution, it will not be a general purpose notetaking, web browsing,
and computing machine.
People have talked
about creating a keyboard for it for some time now via Bluetooth, but
the iPhone software doesn't provide users that freedom yet. There isn't
even a solution to plug a keyboard directly into the machine using the
external port, which would be better for our purposes, as there would
be no Bluetooth power overhead.
Fortunately, folks
have been asking for the external keyboard for years now, and someone
will eventually deliver it. Couple that with the knowledge that Apple
is finally going to make a larger multi-touch screen, the Apple
Tablet in 2010, capable of reading regular-sized web pages, e-books,
and the like, and it's clear that we will finally be able to cobble together
our beloved HPC again.
Once the Apple Tablet
comes out, assuming an external keyboard option can be hacked by then,
all we need to do is hire a good local maker
to start with an old NEC MobilePro 900c body, swap the tablet in as the
replacement screen, throw away the motherboard under the excellent MobilePro
keyboard and reuse that space for spare battery.
We will then have
an amazing HPC back in the US market (albeit a custom built one) six years
after its demise!
As the futurist in
me would say: The more things change, the more some things stay
the same. :)
Dreams for
the Future
I am sure that a lot
more people would buy and wear Tummy PCs if they were very light and thin,
and came from the factory with clips for easy wearing at the waist, and
if they included a few more obviously valuable features (integrated cellphone,
i-Pod, camera, 3G EV-DO modem, games, etc.).
After seven years
wearing one as a pioneer (1998-2005) I am convinced that having a good,
lightweight near full-sized keyboard at the waist is a tremendous asset
for some people, particularly students, writers, and certain professionals.
Keyboards remain useful even with advanced voice recognition, as they
allow you to do two things at once (write and speak, or write and think
about what you want to speak). Keyboards will go away only when human
fingers go away, so there's a large, unserved market here.
There's
also room for some more miniaturization and engineering, which would allow
Tummy PCs to be worn even by petite individuals who would find them too
big and heavy today. I'm sure that the 1.8 pound HPC form factor I wore
for seven years could shrink to one-quarter the size
and one-third the weight in coming years. Now that would
be a truly mass-market wearable!
How do you get a Tummy
PC down below the size of the MobilePro? You can start by using a
keyboard and screen that interleaves in on itself as the cover is closed.
Keyboard and screen size are now the only limiting factors on the size
of the Tummy PC at your waist. The
best example I've seen of this to date is IBM's "butterfly
keyboard" for their 1995 ThinkPad 701 notebook computers. When
you open the cover of a butterfly, the keyboard springs out from interleaved
to a flat configuration almost two inches wider than in the closed position
(note the keyboard overhang in the butterfly picture at right), and it
is quite stable to type on. IBM engineer John
Karidis, who developed the butterfly, tells me it can be
cheaply licensed to any wearable PC maker, so the opportunity is there.
A dual
fold multi-touch screen would also be very nice, allowing the
user to work with half-sized screen for data entry at the waist, but with
an extra half that folds out when you want to browse the web or do other
full screen work.
Now imagine
a Tummy PC which is the full size of the MobilePro HPC when it is fully
unfolded, but when folded, is one-quarter its size, because both
the keyboard and the screen fold once and interleave
once as it closes, and unfold and uninterleave when it opens. Your
Tummy PC could do either under voice control, in just a few seconds.
This, essentially,
is a belt buckle that turns into a Tummy PC, in an instant. Think
I'm dreaming? Someone will eventually deliver this, because human fingers
like to type, and typing at the waist is a natural and very efficient
ergonomic, one I used for seven years. When that happens, the Tummy PC
3.0 will be born.
In the meantime, we
can predict the obvious, and do our best to speed its arrival. Good luck!
Tummy
PC 1.0 Directions
1. Purchase
your own MobilePro HPC ($100-500)
If you are on a restricted
budget, MobilePro 780's or 790's are quite cheap nowadays ($100 on eBay,
$15 for one extra battery). This will work fine for some, but if you can
afford it I recommend the MobilePro
900C ($300-500, $30 for batteries) which has several time-saving innovations.
The four best new features are:
• A USB1.1
slot, which allows you to rapidly move files from your Tummy PC to your
other computers and back using a keychain flash drive (a $20 Iomega
64MB micro
mini flash drive, smaller than a door key, is what I use) instead
of using the slow serial port and sync software, which is your only
transfer option on the older models.
• A coin cell
backup battery holder. It is a dirtly little secret that MobilePro backup
batteries typically die after about 18 months of extended daily use,
and this was the Achilles heel of older units. When your backup battery
dies all the info on your unit vanishes, and you have to go back to
your last backup (a month old? a year?) and start over. With the 700
series you must hand
solder the replacement backup battery yourself, or pay NEC to do
it (a long time without your machine). With the 900 series, you just
snap a new one in. I recommend doing so every January (put it in the
calendar) and you should never run into a data loss problem, even after
years of use.
• The 900
has integrated flash ROM for doing automated onboard backups, which
prevents you from losing all your data just in case your backup battery
does fail. Automated backup using NEC's supplied bUseful utility is
quite simple.
• A new OS,
Microsoft CE .NET 4.2, comes in the 900C, and it is a big upgrade from
the old HPC 2000 OS on the 900 and 700's, and runs on a faster processor.
There's also a double size extended battery available, but at 1.8 lbs
and with its existing size, a standard Tummy PC (with an extra battery
in your pouch) is probably at the upper edge of comfortable all day
wearability, for most people. I don't think I'd want anything heavier.
The only shortcoming
of the 900C, from my perspective, is the passive matrix color screen,
which is faint in daylight and near impossible to read in direct sunlight.
2. Choose
a Mounting System So You Can Wear it at Your Waist
After spending several
days thinking about this problem in 1998, I decided to mount four cell
phone clips on the back of my MobilePro. I've never thought of anything
better than this simple hack, and if you come up with a better solution
let me know. I mount two in vertical orientation so I can clip the unit
to my pants or belt, and two others horizontally as as additional "legs"
to make a sturdy four leg "table" out of the device when resting
on a flat surface (see picture below).
The best clips I've
found are TCC Industries "Clip Kt2's" (http://www.tccinc.com).
The double stick adhesive is very strong. Buy at least six clips, because
if you use your Tummy PC a lot you may break one of the two that you clip
to your waist on occasion, and then you'll need to put a new one on (you
can pry the broken clip off the unit with two jeweler's screwdrivers wedged
underneath, or replace the top half of the clip without prying off the
bottom, depending on which part of the clip hinge breaks). If I could
find these in metal that would be ideal, as they would never break. Unfortunately
plastic is all I've found, so once or twice a year one of them breaks
and I have to fix it.
Before placing your
clips on the MobilePro, carefully peel off the four grey rubber footpads
from the MobilePro (slip an Exacto blade or jeweler's screwdriver under
the pads and pry them off). Then use the alcohol wipes to clean off the
unit before you put on the clips, as below (no need to be perfect, just
get the alignment roughly similar to the picture).
Next,
stick the grey rubber footpads on the phone clips near their top edge,
after roughing up the clip surface with some light sandpaper and wiping
it down. Your MobilePro will now stand up nicely for touch typing on a
table when you aren't wearing it.
Those who don't care
about aesthetics will now be able to clip a silver colored Tummy PC to
their waist, and can use it blissfully unaware of the strange looks of
passersby. Carry the extra battery in your pocket and you are good to
go for the entire day.
3. Take the
Unit to an Upholsterer to Cover the Top Half of Your MobilePro Case With
Fabric
If you care about
looking unobtrusive, you'll probably want pay a local upholsterer to make
a fabric cover for your Tummy PC that includes a pouch to store your extra
battery.
You might also consider
spray painting the silver sides of your MobilePro black, or taking it
to an auto detailer who will do this for you for a small fee. If you are
going to paint it yourself be sure to use masking tape on things you don't
want painted.
Ask your local upholsterer
or auto detailer to put some fabric (I use black nylon) on the MobilePro
that covers the top of the case. See the picture at the top of this article
to see the solution I chose, which is a piece of fabric that wraps around
the case cover and juts out a half inch above the screen at the top, so
it covers the top of the unit when closed, protecting it from spills,
etc.
I'd suggest your case
cover include a pouch to hold your second battery. Make the pouch large
enough to slide the second battery in and out easily. I have found the
ideal dimensions for the cover are 9.5" wide by 6.5" high, and
7.75" wide by 3.375" high for the front pouch. Radius the bottom
corners of the cover, but not the top. The cover will wrap around the
"front/top" of your MobilePro (the side that has the cover latch)
when you are wearing it.
When the cover is
made, your upholsterer will need to make a small hole in it for the cover
latch. This is really the only tricky part. One way to do this is by adding
some fresh whiteout to the cover latch, test wrapping the cover, and lifting
it off. On the underside of the nylon you'll see the whiteout impression,
which shows you where to cut an appropriate sized hole in the cover for
the latch. Now glue your cover onto the MobilePro using something like
3M's Super 77 spray adhesive.
Congratulations! You
now have an upholstered Tummy PC. When closed, it will look and feel like
a fanny pack, very unobtrusive. If you aren't particularly petite, you'll
find it easy to wear all day long.
Contact/Feedback
Feedback? Edits? Omissions?
Feel free to email me at johnsmart{at}accelerating{dot}org.
Good luck and happy computing!
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