HP 9845 option 200 power supply



#4

Hi all!

I posted this already to the classiccmp list, but I'm not sure how much overlap there is, and since this is where I come to get my HP fix, I thought it may be fruitful to cross-post here. I apologize to those who have to see this post twice.

I was fortunate to acquire an HP9845C. I am in the process of moving, so I haven't had a chance to examine it fully. I did open up the base, and it has the option 200 CPU set. It looks pretty clean inside, although the power supply is missing.

I do have a couple of working HP9845B's, but these use the hybrid processor, and my understanding is that the option 200 machines used a beefier supply.

Does anyone know if the regular 9845B supply will work in an option 200 machine?

The design is pretty complicated. I'm wondering if the power supply has any special qualities that would prevent my putting together a switcher to supply the needed voltages, via an adapter.

If I can't find a supply, I may try to "downgrade" the unit to a hybrid processor, by swapping out the CPU from a 9845B, with a replacement ROM board loaded with the 9845C image; or, swap the monitor and keyboard over to a 9845B, and add the 9845C ROM image. Can I expect either or both of those options would work?

Right now, we are in the middle of moving, and I don't expect to have a lab for a few more weeks, but when I do, I would love to try to get this machine up and running.

Many thanks,

Dave


#5

Did you check The HP 9845 Project web site? It's a great resource for information about those computers. Check the Tutorials section.

An HP 9845C, really? You're a lucky guy. I keep my fingers crossed that you'll bring it back to work.


#6

Quote:
Did you check The HP 9845 Project web site? It's a great resource for information about those computers. Check the Tutorials section.

An HP 9845C, really? You're a lucky guy. I keep my fingers crossed that you'll bring it back to work.


I took another look at the site. The tutorial on "Before First Turning On" has some good information on the option 100 vs option 200 power supply. Thanks!

Yes, I was very pleased to find this. My hope is that the monitor is still working or fixable.

Dave


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