[time-nuts] Off the wall: anyone with experienceprogrammingHP3456A?

Poul-Henning Kamp phk at phk.freebsd.dk
Sat Sep 10 17:26:57 EDT 2005

In message <20050910.232445.04090152.cfmd at bredband.net>, Magnus Danielson writes:

>> This is less of a problem with modern CMOS based interface chips.
>Actually, there you end up in another problem, you power the box through the
>protection diodes which you really must have for CMOS. So it is really not so
>much better, just different.

This doesn't happen in any of the designs I've seen.  They basically have 
a FET in series with the line and when the instrument is OFF, it is really

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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