[time-nuts] Low cost GPS module for < 100ns timestamping error

Bob Camp lists at rtty.us
Sun May 4 13:07:52 EDT 2014


Hi

Well some of us still have RSX-11M (and RSTS/E) code floating around …..

Bob


On May 4, 2014, at 12:30 PM, Jim Lux <jimlux at earthlink.net> wrote:

> On 5/4/14, 8:40 AM, Chris Albertson wrote:
>> Looks like this is all you'd need for most timing projects.  Just add your
>> favorite OCXO and some wire.
>> 
>> The SPARC (not Spark) is actually a step up from ARM.  It was developed by
>> Sun Microsystems (now Oracle) it is optimized for things like fast context
>> switching, multi tasking and so on, all the things done by operating
>> systems. The Sparc V8 does 128 bit floating point, (quad precision) I
>> wonder if 200Kb RAM is enough to run an older version of SunOS?  (a BSD
>> variant.)
> 
> Not all SPARC V8s have FPU: the SPARC spec has a lot of flexibilty in implmentation: a lot of "if you want X, then it has to do the following things in the following way, but it's optional"
> 
> http://www.gaisler.com/index.php/products/processors/leon3
> 
> There's multiprocessor versions. Versions with and without cache, versions with and without FPU, etc.
> 
> If you want a POSIX compliant OS, then RTEMS will definitely fit in 200kbytes. Don't know about all the other options.  I've never heard of a SunOS implementation on LEON, but there's a lot of weird stuff out there.  You do want to make sure that whatever you use is reasonably complete and of a reasonably recent version (or at least one you're real familiar with).
> 
> There are a fair number of "one-off" ports of some OS or another to the LEON, but which don't have any continuing support, bug fixes, or users to contribute.  Imagine a grad student doing their thesis on "An implementation of RSX-11M supervisor mode on the LEON3-MP"... they get enough done to demonstrate that it works, and they graduate, and who has a bunch of RSX-11M software anyway.
> 
> 
> 
>> 
>> Are these shipping yet?
>> 
>> 
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