+1 for Dave's comment. Saving at the wrong side may be the cause for continuous pain. Metal dust is not the only problem with a Dremel, a Dremel, as powerful as it is, is per se not a tool for fine wo

I am not sure whether to use a Dremel to cut off the chip legs is always the best method, but this is the way I am doing it if I am sure that the chip is gone. Extracting every pin individually is mor

I would just clean them (with isopropyl or maybe with contact spray). As far as I know the 9835 doesn't have the sophisticated hall-effect-style key mechanisms the 9845 has (which probably last foreve

Hmmm looks like a good visual inspection always is the best point to start... I'll include that in my trouble shooting list 8-) Congratulations on a working system!

cool

Is it protected?

Didn't find any source for HP BASIC/UX or Technical BASIC for HPUX yet, as far as I can report none of the publically available media has it included. hpmuseum still is looking for media (see http://w

Don't think it is a mattter of sync. This would just cause screen flicker/movement and/or geometric distortions, but the characters would be stil readable. I can't see details (the definition of the i

#hp9000S200

@Dave: well, I am ready to learn ;-) -Ansgar

Amazing project. And impressively close to the original. Would effectively do it for the show case. But I am actually looking for the real thing (dusty, rusty, unreliable, and with S-100 bus :-)). I n

Guy, thanks for the quick response. Might be an interesting solution for many of us who depend on overseas shipments. I wasn't aware of that option. This helps at least for those sellers who simply do

Not directly related to HP, but I am looking for an IMSAI 8080 to complete my WarGames show setup. Possibly anyone has a hint where to find one of those. Just tried on eBay, but again the vendor didn'

If it is of help for you, you might want to check https://hp9845.net/9845/tutorials/analyzer I once have written a reverse assembler plugin for a 32-bit USB logic analyzer for the 9845 bus signals, wh

Forgot to mention that also a faulty display circuit and/or CRT may be the reason that you don't see anything on the screen, but in that case you should at least be able to create a noticeable BEEP vi

Stan, possibly you should think about acquiring a logic analyzer for your setup. Don't get me wrong, it is always nice to have spare parts around and swapping them, but in the end you are dependent on

I just received a message that Colin Cantwell passed away last month on May 21. For those who don't know about him, Colin played an important role in the design of the HP 9845C. With his enthusiasm fo

Hi Francesco, nice work! By the way HPDir has a conversion included, just use the -c command line option and HPDir does it for you. Surprisingly that option is rarely known. Example: If BLA is a file

Actually I never detached the motor/capstan from the assembly. I guess it is similar to the HP85. But not all repair techniques require detaching the capstan. -Ansgar

By the way, my experience when separating the CRT from the safety glass, for me it worked out easier to remove the gel when first heating it up a bit (no more than 80 degrees centigrade). Especially f

Hi Stan, congratulations for the success! Well done! To your questions: 1) The display area used by the 9845A is significantly shorter that the full height of the CRT. Is this normal? Yes, it is norma