The new refclock directive is implemented and documented

[Hal Murray]

esr at thyrsus.com said:
>> hp58503a should probably be hpgps.  It works for several devices.
> OK.  Can you enumerate some other devices so I can list them in the header
> comment and on the driver page? 

The documentation already mentions the Z3801A.  There are a lot of them in 
the ham/hacker community courtesy of the cell phone industry many years ago.  
I think these were the first GPSDOs available at recycled prices.  The manual 
is available and makes a good read for background info on GPSDOs.  There is 
lots of non-HP info available on the web.

They are really old (GPS software says COPYRIGHT 1991-1995 MOTOROLA) so the 
GPS units aren't very sensitive.

There are several other Z38xx versions available.  There are usually a few of 
them on eBay.

Recently, a batch of new Z3811/3812 two unit pairs appeared, also known as 
KS-24361.  Lucent unloaded their stockpile.

-- 
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