On 12/26/2011 10:40 PM, mike cook wrote:
Le 26/12/2011 21:31, Hal Murray a écrit :
I turned on a Z3801 that had been idle for a while. The status screen
said:
UTC 20:03:44 [?] 11 May 1992
That looks like 1024 weeks (19.7 years) ago.
When I first turned it on, before finding any satellites, it said:
UTC 12:05:00 [?] 01 Jan 1992
Has anybody else noticed troubles like this?
I've got another one that still works. It's got a bigger serial number
so I
assume it's more recent.
Does anybody know how to read the firmware date or version? There is a
command to get info from the GPS unit, but I haven't found a way to
get any
info for the main firmware.
After a while, the "[?]" goes away.
IIRC the GPSs in the Z3801As are Oncore VPs. They don't suffer from the
GPS week rollover, but If the RTC in the receiver is not set or its
battery has failed, and the reference year stored in EEPROM is also
wrong, the receiver may select the wrong 20-year window. This may be
fixed by entering a date command when the receiver is not tracking
satellites.
send the receiver
/@@Cj
and you will get the revision data.
You do not talk directly to the Oncore VP, but to the clock CPU, which
has a very different command-set. You can get the information out using
the commands which is in there. It was some time that I fiddled with the
Z3801 command-set. I've done some reverse-engineering of the
command-set, but I think the Z3801A manual suffice to get started.
You will get the Oncore VP info indirectly from there.
I have not figured out if you can do something useful with the built-in
FORTH interpreter. It would be handy if one could add monitoring
processes and additional commands for it, but I don't think it is possible.
The Z3801 runs pSOS and includes the pFORTH. I have no details on those,
but would value information to aid me in further reverse-engineering
efforts. The Z3801 is written in C, which is evident from the pSOS libc.
Cheers,
Magnus
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