[time-nuts] Datum/Trimble 9390

Glenn Little WB4UIV glennmaillist at bellsouth.net
Wed Mar 25 03:06:31 UTC 2009

I have a 9390-5593 that does not display the correct date.
The GPS engine uses two processors and three ROMS.
These are glued together with an ASIC.
I contacted Trimble and they cannot identify their engine.
I have read the ROMs and am in the process of disassembling the code.
This is slow.

I suspect that my 9390 had a Y2K problem and/or a 1024 week rollover problem.

Is this possibly the same engine that you replaced the ROMs in??


At 12:04 PM 3/24/2009, you wrote:
>We use the Trimble 9390 where I work.
>Around the Y2K period we received new EPROM sets to put into the units.
>I checked yesterday and they are displaying the correct day and year.
>Let me see if I can find a spare set of EPROMS to download.
>Corby Dawson
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