HP15C LE vs. HP15C

[Katie Wasserman]

(07-06-2014 05:43 PM)Mike Morrow Wrote:  I never owned any of the unfortunate clamshells except the HP 28C and HP 28S. These do not have RTCs. I never had much issue with their battery life, except for the battery door area breakage that occurred, especially in the S model, if batteries were left installed for a long time. :-)

The RTC in the 28C/28S is hidden. You need to do SYSEVAL to access it, but it's there and there have been many programs written that use it. Here's one, for example.