Login [Register]
Don't have an account? Register now to chat, post, use our tools, and much more.
This is an archived, read-only copy of the United-TI subforum , including posts and topic from May 2003 to April 2012. If you would like to discuss any of the topics in this forum, you can visit Cemetech's Calculator Hardware subforum. Some of these topics may also be directly-linked to active Cemetech topics. If you are a Cemetech member with a linked United-TI account, you can link United-TI topics here with your current Cemetech topics.

This forum is locked: you cannot post, reply to, or edit topics. Calculator Modifications => Calculator Hardware
Author Message
DigiTan
Unregistered HyperCam 2


Super Elite (Last Title)


Joined: 10 Nov 2003
Posts: 4468

Posted: 22 Oct 2004 02:54:20 pm    Post subject:

This week I'm going to start on an upgraded version of the External Expansion Device (EED).

The first design allowed any calculator to be powered from a wall adapter and also trippled the battery life by adding AA cells. EED2 will go even further and add 512KB of external RAM (~18 times the original RAM size). The external FLASH can store progs, backups, and pretty much any other kind of 8x.* variable. Other new features will focus on...

Smoother Power Switching

If space allows, the battery/wall switching circuits will be upgraded—so the calc will no longer self-reset if you get unplugged unexpectedly. Also, you’ll be able to unplug the calculator from the wall without turning the calculator off first (this was the biggest limitation in the original design).

Better Look

Finally, I’m overhauling the wiring for better aesthetics. This means no more unsightly exposed busses! The circuit board will be custom-etched this time around to take up less space.

Returning features:
• 3 Power supply options (AAA batteries, AA batteries, or Wall Adapter)
• Automatic power switching
• 24 Hours battery life
• Power adapter can handle 7-18 volts
• Side-mounted “external power on” LED
• Tougher 2.5mm link
• 3.5mm port can power snap-on peripherials

New features:
• Serial DataFLASH memory of 512KB
• Store up to 9 files, including backups (expandable to 1Cool
• 1-key interface
• 2 red/green/orange “mode” LEDs
• Better power filtering
• No more exposed busses!

Possible features:
• High-voltage protection from voltage spikes (need to order new parts)
• IR link support
Universal Translator (will require lots more reseach)


Last edited by Guest on 28 Sep 2005 08:56:55 pm; edited 1 time in total
Back to top
jvdthwip


Advanced Newbie


Joined: 21 Jun 2004
Posts: 93

Posted: 23 Oct 2004 04:29:43 pm    Post subject:

Sounds awesome... except... Won't there be a lot of programming and modifications required for the calc to use the external device? Will the device require the potential user to look around for all the needed parts and assemble from a cryptic guide? Are you going to patent it and get it professionally assembled? Can it be purchased from an online service if you decide to do so?
Back to top
Adm.Wiggin
aka Tianon


Know-It-All


Joined: 02 Jun 2003
Posts: 1874

Posted: 23 Oct 2004 05:04:57 pm    Post subject:

Dude, do you have ANY idea how much it would cost him to take such an endeavor? It's not exactly a small investment.

You find your favorite electronics store, buy the parts, read the instructions. If it doesn't work, you screwed up.


Last edited by Guest on 23 Oct 2004 05:05:26 pm; edited 1 time in total
Back to top
DigiTan
Unregistered HyperCam 2


Super Elite (Last Title)


Joined: 10 Nov 2003
Posts: 4468

Posted: 23 Oct 2004 05:06:59 pm    Post subject:

Yeah, the mod will most likely have a really long building time (even more so than the Playstation mem card mod. So far the walkthough guide will include all the source code needed to pull it off (materials lists, step-by-step guide, etc). I hoping to do it all under $25 and stick mainly to parts that are much easier to find.
Back to top
DigiTan
Unregistered HyperCam 2


Super Elite (Last Title)


Joined: 10 Nov 2003
Posts: 4468

Posted: 03 Nov 2004 01:03:45 am    Post subject:

Okay, here's the preliminary layout. To get an idea of how it compared to the first EED, the parts inside the red box represents the original EED system. Pretty much everything else is brand new. I had to throw in a few annoying bridges this time because it was impossible to create the circuitboard without 'em. The orange and yellow boxes show the 512KB Archive and the controller. Anyway, I downloaded a nice CAD program that will probably speed up the project by a few weeks. I'm estimating the project cost at around 35 US$. More updates later...

Back to top
Arcane Wizard
`semi-hippie`


Super Elite (Last Title)


Joined: 02 Jun 2003
Posts: 8993

Posted: 05 Nov 2004 12:59:53 pm    Post subject:

DigiTan, how would you feel about becoming a UTI member, getting an ftp account (standard issue : ) ) and getting your own subforum for this project?
Back to top
DigiTan
Unregistered HyperCam 2


Super Elite (Last Title)


Joined: 10 Nov 2003
Posts: 4468

Posted: 07 Nov 2004 01:16:15 am    Post subject:

I guess the topic is better off here in the mods section, at least until more progress can be made. But thanks for the invite!

[Update] The first circuitboard design is printed out on paper now. Sometime this week, I'll go to Office Max and make a transparency copy for the UV etching. This will put the project well ahead of schedule. The rest will not be so easy. Some of the circuit traces are extremely close together, so there's little room for error. I'll try to make a "ratsnest" prototype out of spare parts this week. We'll see how it goes... Cool
Back to top
shadowing
Powered by 64


Calc Guru


Joined: 06 Jan 2004
Posts: 1002

Posted: 15 Nov 2004 11:37:41 pm    Post subject:

well... all I could say is wow!!! I would really like to try this, but then I have no expertise in circuitry. I could probably ask my dad. Think he could help me understand. well, still... WOW!!!

Sorry for repeating. If there is any way I could help, plz let me know. I think it is a great idea.
Back to top
DigiTan
Unregistered HyperCam 2


Super Elite (Last Title)


Joined: 10 Nov 2003
Posts: 4468

Posted: 16 Nov 2004 08:54:48 pm    Post subject:

Yeah, it a pretty elabore scheme. Right now, the hardware part is sort of on hold because of 'exam month.' Plus I have to repair the old EED and get the link working again (never use exposed wire). There's also another snag, because of the FLASH chip works, I have transfer calc from the link, then into RAM, and then into FLASH. Hopefully I'll have some simulations done in a few weeks. Cool
Back to top
TeamoComputers


Newbie


Joined: 06 Oct 2004
Posts: 10

Posted: 11 Jan 2005 07:07:33 pm    Post subject:

Was just wondering about the status of this project..
Back to top
DigiTan
Unregistered HyperCam 2


Super Elite (Last Title)


Joined: 10 Nov 2003
Posts: 4468

Posted: 11 Jan 2005 11:35:30 pm    Post subject:

Heh heh. Good question. Wink Well, I downloaded some new info in the TI link protocol, and I'm hoping to write a basic (er...basic ASM) transfer program by February. The prog simulations should show whether the FLASH chip is quick enough for the job.

The latest CAD board layout is done. I just need to make a transparency copy of it at Office Max and do the UV etching.

The whole thing will probably boil down to the etching goes. It was supposed to be easy, but since I didn't fininsh my circuit-etcher project over Christmas, it'll have to be done by hand. That's something I don't have a lot of practice in, and let's just say there's a lot of things that can go wrong. Plus, half my chemicals leaked out in a garage (huge mess), so those will have to be replaced.

But other than that, things are looking up. The design is 100% done. The componets are here. The equipment is..for the most part, ready. It's just a matter of finding the time.


Last edited by Guest on 11 Jan 2005 11:36:55 pm; edited 1 time in total
Back to top
DigiTan
Unregistered HyperCam 2


Super Elite (Last Title)


Joined: 10 Nov 2003
Posts: 4468

Posted: 07 Mar 2005 04:55:44 pm    Post subject:

Okay. I know this project is looking pretty dead now, so I'm going to work on it over spring break, starting today. I'm hoping to finish a flimsy prototype before next monday and hopefully have a (real) circuit board done a week after that.

Also, I might build a tilt-sensitive Calc Guardian attachment to ward of possible theives.
Back to top
Adm.Wiggin
aka Tianon


Know-It-All


Joined: 02 Jun 2003
Posts: 1874

Posted: 18 Apr 2005 04:49:54 pm    Post subject:

Hate to pry, but how's it coming, DigiTan? Any luck? I'm really interested in Eed2...
Back to top
DigiTan
Unregistered HyperCam 2


Super Elite (Last Title)


Joined: 10 Nov 2003
Posts: 4468

Posted: 01 Jun 2005 01:40:54 am    Post subject:

This might be one of those cured projects. The hardware is designed but I still have to port the software from C to ASM so I get this flash chip to work. I also got a bit distracted redisigning the original EED (no more horrendous exposed wires). I finally moved out of school today so hopefully, I'll get to start on this flash code.
Back to top
Solitaire710


Advanced Newbie


Joined: 14 Mar 2005
Posts: 55

Posted: 01 Jun 2005 12:33:09 pm    Post subject:

*Really, Really, Really Interested*
Back to top
aforsy
the leaping penguin


Active Member


Joined: 13 Jul 2004
Posts: 653

Posted: 04 Jun 2005 11:30:30 am    Post subject:

hey, this looks really neat! you might even want to think about patenting and marketing it like jvdthwip said! sure it costs money to start with, but if you're willing to make the investment, the payoff could be substantial!

i, for one, would certainly buy it (or actually probably get my parents to get it for me for my birthday :biggrin: )
Back to top
elfprince13
Retired


Super Elite (Last Title)


Joined: 11 Apr 2005
Posts: 3500

Posted: 04 Jun 2005 03:27:08 pm    Post subject:

I bought my calc myself...hoping to buy a laptop (or Mac mini) myself...would buy this too
Back to top
aforsy
the leaping penguin


Active Member


Joined: 13 Jul 2004
Posts: 653

Posted: 07 Jun 2005 07:15:14 pm    Post subject:

yeah, i wish i had money...i get twenty dollars for mowing the yard, but it doesn't really add up too fast...i guess i ought to get a job...what a pathetic loser i am, heh.
Back to top
elfprince13
Retired


Super Elite (Last Title)


Joined: 11 Apr 2005
Posts: 3500

Posted: 08 Jun 2005 08:48:48 am    Post subject:

elderly relatives who want the house painted are nice...Im drifting off topic....back again.....you definitely need to finish this project...you could start a mail order business
Back to top
Adm.Wiggin
aka Tianon


Know-It-All


Joined: 02 Jun 2003
Posts: 1874

Posted: 08 Jun 2005 10:03:27 pm    Post subject:

If/When he finishes it, I'm sure he will provide detailed instructions for you to "build it yourself".

It's up to him whether we would make you one for a small fee (think large DigiTan, he looks like he *really* wants it Laughing)
Back to top
Display posts from previous:   
Register to Join the Conversation
Have your own thoughts to add to this or any other topic? Want to ask a question, offer a suggestion, share your own programs and projects, upload a file to the file archives, get help with calculator and computer programming, or simply chat with like-minded coders and tech and calculator enthusiasts via the site-wide AJAX SAX widget? Registration for a free Cemetech account only takes a minute.

» Go to Registration page
    » Goto page 1, 2  Next
» View previous topic :: View next topic  
Page 1 of 2 » All times are GMT - 5 Hours

 

Advertisement