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Can someone 'splain these 75Ds to me?



#9

Ok, so I took a flyer and bought myself a couple of HP-75Ds on eBay. Never intended to collect the 41/75/71B series, but what the heck? Price was right.

The 'putes came encased in 82718A modules, which I assume adds a modem and... what else? The auctions were "as is" with no supporting documentation or explanation.

I tried removing one of them from the 82718A - easy enough to do by removing 6 screws, but I see a pair of wires emerging from the side of the computer, leading to a mini-jack on the back of the expansion base. What is that?

The computers themselves seem to take classic series battery packs (and indeed power up and do things once such a pack is inserted). The base looks like it takes a pair of those packs. Only place I see to plug in an AC adapter is on the back of the computer itself - it has two prongs, and looks like it'll take the same charger as an HP-97, but I haven't tried.

I've looked through the docsets on the HP museum CDROMs, and while I find the owners and reference manuals, I don't really see anything pertaining to this external hardware.

Anyone got a clue they'd like to share? Thanks.


#10

I had the same questions in April or so... ;-)
The wires are the ones for the internal speaker, which, when you disassemble your 75d, will be found to be missing. Apparently, when you get the "pod", you get external earphone service, not the usual speaker.
On the good side, you'll probably see, behind your battery pack (yes you got the right batteries) a memory extension. And yes, the HP97 AC adapter is the same one as used on the HP75d.
A speaker can be retrofitted, should you need it. It is not an easy thing, though, and requires some "dremel" modification to a radio-shack speaker part.
Keeping the 75D in the pod may be fun, IF you get its 300-baud modem going; the pod also has the smarts inside to make a barcode reader actually decode UPC type labels.
Your best bet is to get the docs for the 75 on the museum CD-ROM and then explore.... I have never seen good docs for the pod, which is an odd little peripheral, for sure! (Anything you DO find out, please share it here!)


#11

Ok, thanks. Just a couple more questions...

I assume the AC adapter works even when the 75D is in the pod. I've already determined that one of the pod's bays operates the 'pute (probably in place of the pack that'd fit the 75D's podless battery compartment), and I assume the other battery bay powers the pod itself.

Anyone know how much of a risk is involved in operating the thing on AC adapter alone? We're missing some battery compartment doors here, so batteries stay inside as long as I hold them there.


#12

As the NiCds perform not only as supply but as filter as well, and you are using that AC adapter that is notoriously unfiltered, same as on ALL HP classics, the consensus is that it May or May Not be possible, but in any case is NOT RECOMMENDED to run an HP without GOOD NiCd battery packs installed. All that is required for a "battery door" is a piece of stiff plastic (I took a pair of scissors to a CD disc) that will slide in the rails on either side; now your battery is secured. It isn't pretty, but it lets you use the calc with confidence.


#13

When you say "notoriously unfiltered", some people may read this as being a simple rectified DC supply. It is actually AC.


#14

Yah, I knew that particular adapter's an AC supply - says so right on the brick.

The point of the question was actually whether the 75D has a decent enough power supply in it to handle the adapter without batteries. I know this isn't the case for most calcs that HP made, but I figured I'd ask anyway.


#15

Well, according to the manual, "you won't damage the HP-75 by using the computer without a battery pack," which tells me that wall wart only operation isn't expressly prohibited, but is done with the same grain of salt as with the classics.


#16

The 75 series can definitely run on the power supply without the battery pack.

The classics are also able to run without batteries.

It's the woodstocks, that get killed at once.


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