The Museum of HP Calculators

HP Forum Archive 21

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HP-97 Service Manual, newer model
Message #1 Posted by davorin on 14 Sept 2013, 3:27 a.m.

I received the HP museum DVD recently and discovered that my HP-97 model isn't the same as the one mentioned in the service manual, mostly noticeable in the different PCB layout.

Is there a newer version of the HP-97 service manual available?

It has an unpopulated 16-pin DIP socket which might have something to do with IO capabilities.

      
Re: HP-97 Service Manual, newer model
Message #2 Posted by Eric Smith on 14 Sept 2013, 3:49 a.m.,
in response to message #1 by davorin

Yes, that footprint is for a cable to the I/O box of an HP-97S. Aside from the added DIP footprint, there is no electrical difference.

            
Re: HP-97 Service Manual, newer model
Message #3 Posted by davorin on 14 Sept 2013, 3:52 a.m.,
in response to message #2 by Eric Smith

Ah I see...

Is there a documented PCB layout or PCB picture with references to the different chips? Like which one is ROM0, ROM1 etc?

                  
Re: HP-97 Service Manual, newer model
Message #4 Posted by Katie Wasserman on 14 Sept 2013, 3:56 a.m.,
in response to message #3 by davorin

While not exactly what you're looking for, I discuss this a bit in this article about how you might make use of that extra socket.

                        
Re: HP-97 Service Manual, newer model
Message #5 Posted by davorin on 14 Sept 2013, 4:09 a.m.,
in response to message #4 by Katie Wasserman

Hi Katie

This seems to be perfect for capturing the ACT timings with my LeCroy or with a FPGA analyzer.

Are the ROM dumps or assembly listings somewhere available?

                              
Re: HP-97 Service Manual, newer model
Message #6 Posted by Katie Wasserman on 14 Sept 2013, 12:46 p.m.,
in response to message #5 by davorin

I've never seen an assembly listing for the 97, but there are ROM dumps around. See Eric Smith's Nonpareil.

                                    
Re: HP-97 Service Manual, newer model
Message #7 Posted by davorin on 16 Sept 2013, 10:45 a.m.,
in response to message #6 by Katie Wasserman

Me neither..only an assembler listing for the HP-67 from the HP-67 Java simulator.

Though honestly, to me it doesn't look like an assembler listing at all as in the listing I don't see any assembled output that makes sense to me:

0002 L00001: 11111...11 if n/c go to 0370

Whatever this "11111...11" might be ;-)

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