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

[Poul-Henning Kamp]

In message <20050910.231305.55202084.cfmd at bredband.net>, Magnus Danielson writes:

>Just look in the HP5370B service manual and you see that the GPIB interface is
>"passive" (i.e. TTL chips rather than LSI chip). It may not be the marvel of
>modernism.

Some of the smaller devices, like the VHF switches, the entire GPIB interface
is TTL and all commands are single byte commands...

btw: the reason for the limit on number of devices powered down is
that NMOS/TTL based interface chips tend to clamp the bus to ground.
This is less of a problem with modern CMOS based interface chips.

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