Calculator Community > [OTcalc] ARM-Hardware

Hardware Discussion

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alberthrocks:
A super speedy calc that even makes you look slow!

Let's start the discussion for the OTARM! :)

Processor: OMAP TI Processor SoC, 1 GHz (??)
RAM: 512 MB (??)
ROM: 256 MB (??)
LCD: Colorful display, full color here! I suggest res of 320x240, or higher with same aspect ratio. Also, backlight adjustment is also a good idea.
LCD Driver: Not sure, OMAP core might power it
Touchscreen: ??
Keypad: Nspire like, but not copying them
Ports: Mini USB, regular USB, Eithernet, Video (???), 2.5/3.5mm port (??)
Wifi/Bluetooth: Yes, if possible/allowed. AM/FM radio integration perhaps?

[Changes/Additions]
SD Slot: Yes

Dev hardware: BeagleBoard xM (or older), found at http://beagleboard.org/hardware-xM.
Note that this is DEVELOPER hardware, NOT production hardware. Usually it's modified, recreated for prototype, and then sent for mass production.

Some images of the dev hardware:



Old, non xM one:


Non xM dev hardware is $149, the xM dev hardware is $179.
Check the specs out here:
Non xM: http://beagleboard.org/hardware
xM: http://beagleboard.org/hardware-xM

And here's a link to an example implementation of BeagleBoard:
http://antipastohw.blogspot.com/2010/08/using-open-source-graphing-calculator.html

So after all that.... it boils down to:

1) Which processor do you want: fast or slower one? (Note: xM is 1 GHz, old one is 600 MHz)
2) What other features do you want?
3) What screen (and where)? (And other hardware decisions)

jnesselr:
I don't think we should do a touchscreen

SirCmpwn:
I agree.  Touch screens are nice, but lots of users like to have a stylus with their touchscreens (more cumbersome), and it would not provide much help towards math (who wants to use an on-screen numpad?).
I also think we should have 1GB of user storage.

fb39ca4:
I think specs like this is overkill. Also, battery drain is an issue. The non xm beagleboard uses 350ma @ 4.8v, so we would need some large batteries to keep it going for a while. I would aim for >20 hrs of battery life on 4 AA alkaline batteries.
As for the processor, I would say 200mhz at most, and a low power consumption one too.
Feature-wise, we should definitely have a micro-usb port. Also, a 3.5 mm port for connecting to TI calcs and headphones. I'm a little iffy on a SD card slot. It seems a bit too much for a calculator. We might want a second gpu chip, that can do image scaling and rotating, and filling polygons. (For the 3d geometry, we'll say ;))
The screen should be 320x240, similar to the Nspire's, but have color. I think 4-bit rgb will be enough. (light and dark RGBCMY, black, white, and two shades of gray)

SirCmpwn:
I don't agree with the GPU, or the micro-usb.  Micro-usb is much more supported.
And if an SD card slot is too much, a GPU is *way* too much :P

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