[aprssig] APRS for One-Laptop-Per-Child
Stephen H. Smith
wa8lmf2 at aol.com
Mon Nov 12 12:26:47 EST 2007
Stephen H. Smith wrote:
>>
>
>
> Since the OLPC runs a Linux-based operating system, probably Xastir
> could be made to run on it fairly easily.
> Wonder if the sound system is sufficiently "normal" (i.e. PC-like)
> that the Linux sound card TNC driver would work. (Or is that
> implemented in X86 code that won't run at all on the CPU in the OLPC?)
Looks like it does use "PC-like" architecture, including an AC '97 audio
system.
From the http://laptop.org website:
[Note that the only I/O is audio, USB and a flash card slot. No ethernet.]
Specifications
Physical dimensions:
* Approximate dimensions: 242mm×228mm×32mm;
* Approximate weight: 1.45KG with LiFeP battery; 1.58KG with NiMH
battery;
* Configuration: Convertible laptop with pivoting, reversible
display; dirt- and moisture-resistant system enclosure; no fan.
Core electronics:
* CPU: x86-compatible processor with 64KB each L1 I and D cache; at
least 128KB L2 cache; AMD Geode LX-700 at 0.8W (datasheet
<http://www.amd.com/us-en/assets/content_type/DownloadableAssets/33358e_lx_900_productb.pdf>);
* CPU clock speed: 433 Mhz;
* ISA compatibility: Support for both the MMX and 3DNow! x86
instruction-set extensions; Athlon instruction set (including MMX
and 3DNow! Enhanced) with additional Geode-specific instructions;
* Companion chips: PCI and memory interface integrated with CPU;
North Bridge: PCI and Memory Interface integrated with Geode CPU;
AMD CS5536 South Bridge (datasheet
<http://www.amd.com/files/connectivitysolutions/geode/geode_lx/33238f_cs5536_ds.zip>);
* Graphics controller: Integrated with Geode CPU; unified memory
architecture;
* Embedded controller: ENE KB3700
<http://wiki.laptop.org/go/Image:KB3700-ds-01.pdf> or ENE KB3700B;
* DRAM memory: 256 MiB dynamic RAM;
* Data rate: Dual — DDR333 — 166 Mhz;
* 1024KB SPI-interface flash ROM;
* Mass storage: 1024 MiB SLC NAND flash, high-speed flash controller;
* Drives: No rotating media;
* CAFE ASIC (Camera, Flash Enabler chip, provides high-performance
Camera, NAND FLASH and SD interfaces); Marvell 88ALP01: (CAFE
specification <http://www.marvell.com/products/pcconn/88ALP01.jsp>).
Display:
* Liquid-crystal display: 7.5” Dual-mode TFT display;
* Viewing area: 152.4mm × 114.3mm;
* Resolution: 1200 (H) × 900 (V) resolution (200 DPI);
* Monochrome display: High-resolution, reflective sunlight-readable
monochrome mode; Color display: Standard-resolution,
Quincunx-sampled, transmissive color mode;
* LCD power consumption: 0.1 Watt with backlight off; 0.2–1.0 Watt
with backlight on;
* The display-controller chip (DCON) with memory that enables the
display to remain live with the processor suspended; the display
and this chip are the basis of our extremely low power
architecture; the display controller chip also enables deswizzling
and anti-aliasing in color mode.
Integrated peripherals:
* Keyboard: 80+ keys, 1.0mm stroke; sealed rubber-membrane
key-switch assembly;
o Keyboard layout details;
<http://wiki.laptop.org/go/OLPC_Keyboard_layouts>
o Keyboard layout pictures: international
<http://wiki.laptop.org/go/Image:Keyboard_english.png>, Thai
<http://wiki.laptop.org/go/Image:Keyboard%20thai.png>,
Arabic <http://wiki.laptop.org/go/Image:AR-MP-v1.png>,
Spanish <http://wiki.laptop.org/go/Image:ES-MP-v1.png>,
Portuguese <http://wiki.laptop.org/go/Image:BR-MP-v1.png>,
West African
<http://wiki.laptop.org/go/Image:NG-MP-alt.png>, Urdu
<http://wiki.laptop.org/go/Image:Urdu-MP.png>, Mongolian
<http://wiki.laptop.org/go/Image:MO-MP-v1.png>, Cyrillic
<http://wiki.laptop.org/go/Image:RU-MP-v1.png>, Amharic
<http://wiki.laptop.org/go/Image:Ethiopic-B3.png>;
* Gamepad: Two sets of four-direction cursor-control keys;
* Touchpad: Dual capacitance/resistive touchpad; supports
written-input mode; ALPS Electric Dual capacitive/resistive touchpad;
* Audio: AC97-compatible audio audio subsystem; internal stereo
speakers and amplifier; internal monophonic microphone; jacks for
external headphones and microphone; Analog Devices AD1888 and
Analog Devices SSM2211 for audio amplification;
* Wireless networking: Integrated 802.11b/g (2.4GHz) interface;
802.11s (Mesh) networking supported; dual adjustable, rotating
coaxial antennas; supports diversity reception; capable of mesh
operation when CPU is powered down; Marvell Libertas 88W8388
controller and 88W8015 radio;
* Status indicators: Power, battery, WiFi (2); visible when lid is
open or closed; microphone in-use and camera in-use visible when
lid is open;
* Video camera: integrated color vision camera; 640×480 resolution
at 30FPS; Omnivision OV7670
<http://www.ovt.com/products/part_detail.asp?id=53>.
External connectors:
* DC power: 6mm (1.65mm center pin) connector; 11 to 18 V input
usable, –32 to 40 V input tolerated; power draw limited to 15 W;
* Headphone output: Standard 3.5mm 3-pin switched stereo audio jack;
* Microphone input: Standard 3.5mm 2-pin switched mono microphone
jack; selectable 2V DC bias; selectable sensor-input mode (DC or
AC coupled);
* USB: Three Type-A USB-2.0 connectors; up to 1A power supplied (total);
* Flash explansion: MMC/SD Card slot.
Battery:
* Pack type: 2 or 4 cells LiFePO4; or 5 cells NiMH, approximately 6V
series configuration;
* Capacity: 22.8 Watt-hours (LiFePO4); 16.5 Watt-hours (NiMH);
* Fully-enclosed “hard” case; user removable;
* Electronics integrated with pack provide:
* Identification;
* Battery charge and capacity information;
* Thermal and over-current sensors along with cutoff switch to
protect battery;
* Minimum 2,000 charge/discharge cycles (to 50% capacity of new);
* Power management <http://wiki.laptop.org/go/Power_Management> will
be critical.
BIOS/loader
* Open Firmware used to load the operating system.
Environmental specifications:
* Temperature: UL certification planned to 45C in Q32007, pending
50C certification in mid-2008;
* Humidity: UL certification planned to IP42 (perhaps higher) when
closed, the unit should seal well enough that children walking to
and from school need not fear rainstorms and dust;
* Maximum altitude: –15m to 3048m (14.7 to 10.1 PSIA) (operating),
–15m to 12192m (14.7 to 4.4 PSIA) (non-operating);
* Shock 125g, 2ms, half-sine (operating) 200g, 2ms, half-sine
(non-operating);
* Random vibration: 0.75g zero-to-peak, 10Hz to 500Hz, 0.25 oct/min
sweep rate (operating); 1.5g zero-to-peak, 10Hz to 500Hz, 0.5
oct/min sweep rate (nonoperating);
* 2mm plastic walls (1.3mm is typical for most systems).
Regulatory requirements:
* The usual US and EU EMI/EMC (Electromagnetic Interference and
Compatibility) requirements will be met;
* The laptop meets IEC 60950-1, EN 60950-1, and CSA/UL 60950-1
specifications. It also complies with UL 1310 and UL 498. In order
to guarantee the safety of children using the laptop, it also
passes ASTM F 963;
* The external power adapter complies with IEC, EN, and CSA/UL 60950-1;
* The removable battery pack complies with IEC, EN, and CSA/UL
60950-1 and UL 2054;
* RoHS (Restriction of Hazardous Substances Directive – EU) compliant.
> --
>
> Stephen H. Smith wa8lmf (at) aol.com
> EchoLink Node: 14400 [Think bottom of the 2M band]
> Home Page: http://wa8lmf.com --OR-- http://wa8lmf.net
>
> NEW! World Digipeater Map
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>
> JavAPRS Filter Port 14580 Guide
> http://wa8lmf.net/aprs/JAVaprsFilters.htm
>
> "APRS 101" Explanation of APRS Path Selection & Digipeating
> http://wa8lmf.net/DigiPaths
>
> Updated "Rev H" APRS http://wa8lmf.net/aprs
> Symbols Set for UI-View,
> UIpoint and APRSplus:
>
>
>
>
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