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HP15C LE vs. HP15C
07-07-2014, 04:28 AM
Post: #23
RE: HP15C LE vs. HP15C
(07-06-2014 05:52 PM)Katie Wasserman Wrote:  The RTC in the 28C/28S is hidden. You need to do SYSEVEL to access it, but it's there and there have been many programs written that use it. Here's one, for example.

Thanks much for that information, Katie. This is the first I've heard of an RTC in the HP 28 series, even though I purchased my HP 28C 28 years ago. One must wonder why the RTC was not made an explicit user function...maybe it's like the RTC in the HP 38gii...its firmware does not present it to the user. The HP 42S is similar...RTC in hardware but not presented to the user...in contrast to the HP 17Bi. Perhaps the real problem was not enough ROM to implement in the 42S or 28C/S.

I never warmed up to the 28-series nor spent much time with mine, nor any later RPL machines until the HP 50G appeared (albeit with its somewhat buggy RTC functions).
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Messages In This Thread
HP15C LE vs. HP15C - rkf - 07-03-2014, 03:40 PM
RE: HP15C LE vs. HP15C - Mark Hardman - 07-03-2014, 04:38 PM
RE: HP15C LE vs. HP15C - rkf - 07-03-2014, 08:38 PM
RE: HP15C LE vs. HP15C - jebem - 07-05-2014, 03:45 PM
RE: HP15C LE vs. HP15C - kakima - 07-03-2014, 09:03 PM
RE: HP15C LE vs. HP15C - rkf - 07-04-2014, 03:47 AM
RE: HP15C LE vs. HP15C - Mike Morrow - 07-04-2014, 05:05 AM
RE: HP15C LE vs. HP15C - Thomas Radtke - 07-04-2014, 08:48 AM
RE: HP15C LE vs. HP15C - Mike Morrow - 07-04-2014, 05:43 PM
RE: HP15C LE vs. HP15C - Tugdual - 07-04-2014, 06:38 PM
RE: HP15C LE vs. HP15C - axd1967 - 10-01-2015, 08:55 AM
RE: HP15C LE vs. HP15C - Marcio - 01-12-2016, 08:56 PM
RE: HP15C LE vs. HP15C - JimP - 07-05-2014, 02:24 AM
RE: HP15C LE vs. HP15C - Steve Simpkin - 07-05-2014, 07:17 AM
RE: HP15C LE vs. HP15C - Katie Wasserman - 07-05-2014, 03:52 PM
RE: HP15C LE vs. HP15C - BillCRAV - 03-13-2016, 01:17 PM
RE: HP15C LE vs. HP15C - Dave Frederickson - 03-13-2016, 03:07 PM
RE: HP15C LE vs. HP15C - Katie Wasserman - 03-13-2016, 03:53 PM
RE: HP15C LE vs. HP15C - Thomas Radtke - 07-06-2014, 08:23 AM
RE: HP15C LE vs. HP15C - Katie Wasserman - 07-06-2014, 04:27 PM
RE: HP15C LE vs. HP15C - Tugdual - 07-06-2014, 05:18 PM
RE: HP15C LE vs. HP15C - Katie Wasserman - 07-06-2014, 05:45 PM
RE: HP15C LE vs. HP15C - Tugdual - 07-06-2014, 08:20 PM
RE: HP15C LE vs. HP15C - Thomas Radtke - 07-07-2014, 07:30 AM
RE: HP15C LE vs. HP15C - Mike Morrow - 07-06-2014, 05:43 PM
RE: HP15C LE vs. HP15C - Katie Wasserman - 07-06-2014, 05:52 PM
RE: HP15C LE vs. HP15C - Mike Morrow - 07-07-2014 04:28 AM
RE: HP15C LE vs. HP15C - brouhaha - 10-05-2014, 03:57 AM
RE: HP15C LE vs. HP15C - Paul Dale - 10-05-2014, 04:34 AM
RE: HP15C LE vs. HP15C - robert rozee - 10-06-2014, 06:44 AM
RE: HP15C LE vs. HP15C - Paul Dale - 10-06-2014, 07:39 AM
RE: HP15C LE vs. HP15C - walter b - 10-06-2014, 08:27 AM
RE: HP15C LE vs. HP15C - robert rozee - 10-06-2014, 09:30 AM
RE: HP15C LE vs. HP15C - brouhaha - 10-06-2014, 10:10 AM
RE: HP15C LE vs. HP15C - walter b - 10-06-2014, 10:19 AM
RE: HP15C LE vs. HP15C - David Hayden - 01-12-2016, 10:45 PM
RE: HP15C LE vs. HP15C - brickviking - 10-01-2015, 10:48 PM
RE: HP15C LE vs. HP15C - ElectroDuende - 10-01-2014, 01:52 PM
RE: HP15C LE vs. HP15C - jebem - 07-06-2014, 12:37 PM
RE: HP15C LE vs. HP15C - Katie Wasserman - 07-06-2014, 04:06 PM



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