> On Oct 29, 2020, at 5:28 AM, guus.assm...@wolmail.nl wrote:
>
> Hello,
>
> The 8080 processor has an instruction set, that's really logical if you write
> in in Octal inestead of Hex.
IIRC, the 8080 instruction set was octal, at least in the beginning, but it's
been a VERY long time since
It’s direct drive, 5 x HV5622.
According to the datasheet, for 200V the resistor should be 18k. I don’t
want to change the 14 anode resistors because I don’t want to play around
the tubes with the hot air gun if not absolutely necessary.
I can try to increment the voltage to 175V, I think that
Ronald Dekker also has an article on Ring counters too:
https://www.dos4ever.com/ring/ring.html if you want to know more about them
- circuits with neon tubes and semiconductors are shown and explained, even
driving Nixies.
/Martin
On Thursday, 29 October 2020 14:52:01 UTC+1, peter bunge wrote
Thank you Martin and the others that explained that I.C. means Internal
Connection.
I thought of the 4017 last night and looked up the maximum voltage of 6
volts. I was not sure if that would be enough for reliable switching but
apparently it is.
Thank you for the Elektor article link, I think the
Oh. Are you also using multiplexing? In my experience that can exacerbate the
problem.
> On Oct 29, 2020, at 7:52 AM, Paul Andrews wrote:
>
>
> Also, I was reminded recently of a couple of things. Firstly that older
> nixies often have a higher maintenance voltage. Secondly that the data she
I just spotted this one:
https://www.ikea.com/us/en/p/duktig-toy-cash-register-80256501/ maybe it
could be used as a base for those who want to build a calculator with fewer
digits?
I do not know what it looks like inside but it seems to be space enough for
the electronics.
/Martin
--
You r
Also, I was reminded recently of a couple of things. Firstly that older
nixies often have a higher maintenance voltage. Secondly that the data
sheets always recommend a minimum voltage of 200V, and the higher the
better. I have certainly had tubes that refuse to perform at these low
modern vol
The number of digits was determined by the maximum print area of my 3D
printer.
The software is still in progress, there are some features I would like to
add:
- switch between radians and degrees
- fixed decimals mode, right now there is only a floating mode
- padding mode with leading zeroes
-
Hello,
The 8080 processor has an instruction set, that's really logical if you write
in in Octal inestead of Hex.
BR/
Guus
> Op 29-10-2020 03:07 schreef Charles MacDonald :
>
>
> On 2020-10-28 7:01 p.m., Jon wrote:
>
> > The DK25 is the only base-8 counting tube as far as I know, which is w
Ronald Dekker at https://www.dos4ever.com/Z550M/Z550M.html has written an
article on the development of these. There is also an article in Elektor
magazine from 2009 where Ronald shows how to drive them with a CMOS CD4017,
have a look here:
http://gkdv.se/pub/material/electronics%20magazine%20a
Yes, that was the only vague speculation I could come up with too -
displaying a 3 bit 'byte' in early binary calculators or similar. But I've
not found any documentation that points in that (or indeed any) direction.
The obscurity of the application probably accounts for why they're as rare
as
8453 is the US EIA/JEDEC registration for the Philips Z550M, also found in
Europe marked as ZM1050. If you search Z550M you'll have more luck. But
really all you need is Ronald Dekker's comprehensive piece of historical
research at https://www.dos4ever.com/Z550M/Z550M.html
Jon.
On Thursday, Oc
I've just re-read this thread and really like the way that this project has
developed. I think I need to make one at some point. I have no idea how one
might go about programming a calculator but would love to find out about
it. I'm guessing that it took a bit longer than the 2hrs you'd planned?
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