There are some available on ebay. Just search “hp 2640b”

Sent from my Dec Alphastation 200.

> On Nov 7, 2024, at 11:41, Sytse van Slooten via cctalk 
> <cctalk@classiccmp.org> wrote:
> 
> Hi all,
> 
> I have a HP 1640B that I'm trying to get to work. However I can't find any 
> information about it, and while the machine itself it straightforward enough 
> (and I remember enough from when I was using it in my first dayjob) I can not 
> find anything about how to use the GPIB interface that it has.
> 
> The reason I'm interested is, we've finally managed to add GPIB support to 
> the PDP2011-MINC fpga implementation, and I'd like to test against a 
> different target than the relatively modern Philips/Fluke counter I'm now 
> using. And the 1640B is the only other GPIB instrument I have...
> 
> The HP doesn't seem to know the ID? command (that causes an error message on 
> the screen). It does respond to a newline (the standard 
> is-this-listener-present test that the MINC code implements), so at least 
> something is working.
> 
> Does anyone here have any docs on the HP 1640B? It'd be very helpful at least 
> to know which GPIB commands are implemented.
> 
> thanks in advance!
> 
> Sytse

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