HP-110 Plus laptop power supply specs?

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Sun Jun 27 15:45:50 2004

>
> I picked a HP-110 Plus (the German version, if it matters) recently, but
> the power supply was nowhere to be found.
>
> Does anybody have the pinout and voltage/current requirements?

It's 8V AC (so there's no pinout information as such) from a 3VA
transformer of some 11 ohms internal resistance (and yes, that is
important according to the technical reference manual which I happen to
have).

Incidnetlaly, the HP adapter has a pair of inverse-series 27V zener
diodes moulded into the output socket. Not many people know they're
there [1]...

It uses the same PSU/charger as many other HP products (HP10, HP19C, HP91,
HP92, HP95C, HP97, HP97S, HP41 (with rechargeable pack), HP71B, HP75C/D,
HP82161, HP82162, HP82163, HP82164, HP82165, HP82168, HP82169, HP2225B,
HP9114A/B, etc). This is a very common and easy-to-find adapter, post an
advert on the museum of HP calculators (http://www.hpmuseum.org) and you
should get some replies.

[1] For the HP hackers here, that's also the difference between the -A
and -B adapters for the Woodstock and Spice series of calculators. The
latter, designed for machines with continuous memory, have the zeners to
remove spikes that could otherwise corrupt memory contents.

>
> Failing that, would it be safe to remove the battery and connect a 6VDC
> power supply to the battery terminals?

Should be OK, but of course you'll lose the memory contents (including
the A: ramdisk) and configuration data when you turn the PSU off.

FWIW I have both the service manual and technical manual for the 110+
(Portable Plus) and can look things up if you need me to.

-tony
Received on Sun Jun 27 2004 - 15:45:50 BST

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