On Thu, Jun 6, 2019 at 8:57 PM CuriousMarc via cctalk <cctalk@classiccmp.org> wrote: > > All HP fans in general and Tony in particular, > I have the exact same problem. HP98035 real time clock module > (http://hpmuseum.net/display_item.php?hw=168), plugged into a HP9825T > (http://hpmuseum.net/display_item.php?hw=171), accepts commands, reads back > all 8's. Battery is new, is charging and at the correct voltage. > Documentation says "never run the module without the battery or it would > damage the AC5954N clock chip". When I got the module it had not battery in > it, so this is what could have happened. Tony, did you eventually repair > your module or find some data on the clock chip?
I've certainly got a working 98035, but I can't remember if I repaired this one. The clock chip seems to be a normal digital watch/clock chip. The inputs to it are essentially the 'set' buttons, the outputs are the 7 segment lines and digit strobes. But I have not found a data sheet on it anywhere. -tony
