+- HP Forums (https://www.hpmuseum.org/forum)
+-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html)
+--- Forum: General Forum (/forum-4.html)
+--- Thread: HP12C: date functions and flashing display ?! (/thread-10016.html)
HP12C: date functions and flashing display ?! - Dieter - 01-25-2018 07:14 PM
First of all: I do not have a real 12C, instead I am using HP's own emulator which I think is supposed to behave like the real thing.
And here I noticed something that I cannot explain (yet):
In some cases the date functions (ΔDYS and DATE) return the result with a flashing display if the function is executed in a program (!).
Example:
1,011900 [ENTER] 1,012000 g[ΔDYS] => 36524
Fine. Now do the same thing within a program.
Clear program memory, then enter ΔDYS as step 01.
f[P/R] f[PRGM] g[ΔDYS] f[P/R]
1,011900 [ENTER] 1,012000 [SST] => 36524 flashing
Is this the same on a real 12C or a quirk in the emulator?
If this is by design: what causes the display to flash?
Dieter
RE: HP12C: date functions and flashing display ?! - Don Shepherd - 01-25-2018 08:05 PM
(01-25-2018 07:14 PM)Dieter Wrote: Is this the same on a real 12C or a quirk in the emulator?
Neither my old 12c (2001 with 1 batt) nor the 12c+ (2008 I think, 2 batts) exhibit this flashing behavior.
RE: HP12C: date functions and flashing display ?! - TheKaneB - 01-25-2018 10:03 PM
My first generation made in USA (3 LR44 batteries, 27th week 1984) do not flash.
Given the tests, I assume it's a bug in the emulator. Maybe the flashing "running" display causes the end result to flash also, for some reason?
RE: HP12C: date functions and flashing display ?! - Carsen - 01-25-2018 10:53 PM
My modern HP-12C does exhibit this behavior. It flashes when only used in the program. It was bought back in late 2016.
RE: HP12C: date functions and flashing display ?! - Gamo - 01-26-2018 01:07 AM
Yes I try on both the HP own Emulator on PC and 12C+ gave result with flashing answer.
According to the HP-12C Owner's Handbook on the topic about Number of Days Between Dates state that
"When [DATE] is executed as an instruction in a running program, the calculator pauses for about 1 second to display the result, then resumes program execution."
So I guess when running DATE in a program it PAUSE one second then going in to a loop cycle that cause the flashing I'm not sure if this is the reason.
Gamo
RE: HP12C: date functions and flashing display ?! - rprosperi - 01-26-2018 02:03 AM
I tried this on an early 12C+, (s/n 4CY147099S, w/2xCR2032) and it does NOT flash when activated in a program via SST as Dieter suggested. The s/n confirms this is the initial 12C+ design; the latter 12C+ design (with new CPU) was introduced about April '15, so Carsen's is almost certainly this latter version.
To summarize:
12C+ V1 (2008-2015): No Flash
12C+ V2 (2015+): Flashes
@Dieter - what vintage is the 12C emulator you are using?
RE: HP12C: date functions and flashing display ?! - Dieter - 01-26-2018 07:54 AM
(01-26-2018 02:03 AM)rprosperi Wrote: 12C+ V1 (2008-2015): No Flash
12C+ V2 (2015+): Flashes
@Dieter - what vintage is the 12C emulator you are using?
The emulator says "Version 2012 11 29 Rev. 19022".
Dieter
RE: HP12C: date functions and flashing display ?! - Dieter - 01-26-2018 07:57 AM
(01-26-2018 01:07 AM)Gamo Wrote: "When [DATE] is executed as an instruction in a running program, the calculator pauses for about 1 second to display the result, then resumes program execution."
That's the DATE command.
But the example refers to ΔDYS.
Dieter
RE: HP12C: date functions and flashing display ?! - grsbanks - 01-26-2018 09:44 AM
I don't have an HP-12C to hand right now (no batteries in it) but I do have a SwissMicros DM12L, which runs the original HP-12C's ROM in an emulator.
No flashing.