HP Forums / HP Calculators (and very old HP Computers) / General Forum v / HP-97S trouble: shown 0. 00 instead of 0.00

Post Reply 
HP-97S trouble: shown 0. 00 instead of 0.00
07-30-2023, 09:59 PM (This post was last modified: 07-30-2023 10:35 PM by teenix.)
Post: #2
teenix Offline
Senior Member
 		Posts: 2,061
Joined: May 2016
RE: HP-97S trouble: shown 0. 00 instead of 0.00
It looks like the HP microcode is not operating properly.

It might be a ROM or RAM failure, or another problem could the one or more capacitors in the power supply need replacing.

I can recreate the display problem by failing RAM register $3E which controls the display mode, but it does not account for the other issues.

If I fail RAM $30 to $3F completely, I get very similar results to you, but not quite the same.

cheers

Tony
Find all posts by this user
Quote this message in a reply
Post Reply 


Messages In This Thread
RE: HP-97S trouble: shown 0. 00 instead of 0.00 - teenix - 07-30-2023 09:59 PM



User(s) browsing this thread: 1 Guest(s)

Contact Us | The Museum of HP Calculators | Return to Top | Return to Content | Lite (Archive) Mode | RSS Syndication