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What a pity... I've always found the accuracy factor management to be a real helper: I missed it in the newer calcs.
Greetings,
Massimo
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I think it is very useful, as it tends to make the clock quite accurate. I can never remember if it works with daylight savings hour (T+X). Hence, I tend to correct it once and live quite happily with it after that not trying to correct it again.
I would say it is important. The whole Time module is a piece of very well designed part of the HP-41 system. I am very especially impressed by the programming of it..
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I suppose it depends on the cost versus accuracy of available crystals. Do you have room for a 3mm variable capacitor to trim the crystal frequency? I must have gotten lucky. My 41cx (time module is not separate) keeps very accurate time without ever applying a correction factor.
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I've got the accuracy factor implemented in the firmware for the DIY4, though I couldn't do it the same way the timer chip hardware does. The way I've done it has the same long-term effect, but bunches the correction into a periodic "leap-centisecond" or missing centisecond. While having the correction occur closer to continuously would be better, this seemed like a reasonable compromise. Maybe something similar can be done in hardware with less logic required?
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Perhaps you could condition the clock in software? How about NTP/HP-IL? (0.5 :))
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Nice to have, but not necessary especially if it will make the time module form factor or system integration with 41CL much more difficult. Also I think with the current xtal and components the time keeping precision of the time module would be as good as a regular wrist watch.
In addition, personally I have no problem of the time precision of the WP-34S. If the same was achieved on 41CL with a time module, personally I don't see the need to use the AF adjustment.
Thank you again for making the 41CL a reality and investing your time and resources into the time module. Very much appreciated!
-Cheers, Kerem
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I think a good solution would be to integrate as much of the timer functionality in the 41CL as you can and give the user the option of disabling it entirely in favor of an actual time module if they wish.
If the omitted functions are critical for a particular user they could then install an actual module and go with that.
The impact of no accuracy adjustment could be ameliorated by (as noted above) using a higher accuracy crystal, incorporating a physical trimmer or a even a TCXO.
I'd say it's well worth the effort of including. I know it's not a 100% solution, but for me it would be 95%. Given the price of used time modules, that's a significant accomplishment.
Bob
Edited: 16 Jan 2012, 12:00 p.m.