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Discussion of precise time and frequency measurement

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Re: [time-nuts] Time servers on a well known web site.

HM
Hal Murray
Thu, Jul 9, 2009 5:46 PM

Some of the earlier Linksys WRTG routers are also popular targets for
home brewed Linux based "appliances", and there is also a lot of
information about regarding hacking the hardware to include a "real"
serial port too.  (Seems, the only parts missing are the RS232 line
drivers, and the 9way D socket!) It's a pity that the availability of
the early versions that will run Linux etc, are becoming less common.

Early WRT54G boxes had lots (relatively speaking) of RAM/ROM.  To cut costs,
Linksys switched from Linux to ??? and reduced the RAM.

They now make a WRT54GL version that has more RAM.  I assume they charge more
for it, but I haven't checked prices.  When I got one a couple of years ago,
I paid the few extra $ in case I wanted to install non-standard software.

I'm pretty sure the Linux hackers have managed to squeeze things into the
smaller RAM of the newer boxes.

Lots of info at http://en.wikipedia.org/wiki/WRT54GL

--
These are my opinions, not necessarily my employer's.  I hate spam.

> Some of the earlier Linksys WRTG routers are also popular targets for > home brewed Linux based "appliances", and there is also a lot of > information about regarding hacking the hardware to include a "real" > serial port too. (Seems, the only parts missing are the RS232 line > drivers, and the 9way D socket!) It's a pity that the availability of > the early versions that will run Linux etc, are becoming less common. Early WRT54G boxes had lots (relatively speaking) of RAM/ROM. To cut costs, Linksys switched from Linux to ??? and reduced the RAM. They now make a WRT54GL version that has more RAM. I assume they charge more for it, but I haven't checked prices. When I got one a couple of years ago, I paid the few extra $ in case I wanted to install non-standard software. I'm pretty sure the Linux hackers have managed to squeeze things into the smaller RAM of the newer boxes. Lots of info at http://en.wikipedia.org/wiki/WRT54GL -- These are my opinions, not necessarily my employer's. I hate spam.
JH
Javier Herrero
Thu, Jul 9, 2009 8:10 PM

Early WRT54G boxes had lots (relatively speaking) of RAM/ROM.  To cut costs,
Linksys switched from Linux to ??? and reduced the RAM.

to VxWorks

Regards,

Javier

--

Javier Herrero                            EMAIL: jherrero@hvsistemas.com
HV Sistemas S.L.                          PHONE:        +34 949 336 806
Los Charcones, 17A                        FAX:          +34 949 336 792
19170 El Casar - Guadalajara - Spain      WEB: http://www.hvsistemas.com

> Early WRT54G boxes had lots (relatively speaking) of RAM/ROM. To cut costs, > Linksys switched from Linux to ??? and reduced the RAM. > > to VxWorks Regards, Javier -- ------------------------------------------------------------------------ Javier Herrero EMAIL: jherrero@hvsistemas.com HV Sistemas S.L. PHONE: +34 949 336 806 Los Charcones, 17A FAX: +34 949 336 792 19170 El Casar - Guadalajara - Spain WEB: http://www.hvsistemas.com
B
bg@lysator.liu.se
Thu, Jul 9, 2009 8:14 PM

Some of the earlier Linksys WRTG routers are also popular targets for
home brewed Linux based "appliances", and there is also a lot of
information about regarding hacking the hardware to include a "real"
serial port too.  (Seems, the only parts missing are the RS232 line
drivers, and the 9way D socket!) It's a pity that the availability of
the early versions that will run Linux etc, are becoming less common.

I'm pretty sure the Linux hackers have managed to squeeze things into the
smaller RAM of the newer boxes.

Lots of info at http://en.wikipedia.org/wiki/WRT54GL

There is often a simple hardware hack available to get a (gnd, rx, tx)
serial port on most router/nas/embedded appliances.

I do not remember seeing any that had an input status pin. DCD (pin 1) is
most often used. Thus lacking a good way to use a 1PPS, the serial
interface might be beaten by a USB. We might be leaving time-nut territory
wrt time accuracy anyway.

--

Björn

>> Some of the earlier Linksys WRTG routers are also popular targets for >> home brewed Linux based "appliances", and there is also a lot of >> information about regarding hacking the hardware to include a "real" >> serial port too. (Seems, the only parts missing are the RS232 line >> drivers, and the 9way D socket!) It's a pity that the availability of >> the early versions that will run Linux etc, are becoming less common. > > I'm pretty sure the Linux hackers have managed to squeeze things into the > smaller RAM of the newer boxes. > > Lots of info at http://en.wikipedia.org/wiki/WRT54GL There is often a simple hardware hack available to get a (gnd, rx, tx) serial port on most router/nas/embedded appliances. I do not remember seeing any that had an input status pin. DCD (pin 1) is most often used. Thus lacking a good way to use a 1PPS, the serial interface might be beaten by a USB. We might be leaving time-nut territory wrt time accuracy anyway. -- Björn