Chuck is so old On Mon, Jul 23, 2018 at 3:13 PM <[email protected]> wrote:
> If I had nothing but time, I would build a relay based finite state > machine to be the calculator. > It would probably take a relay rack or two of relays. Even super tiny pcb > mount relays would take some considerable room when you are chaining up > half adders etc. > > I think some guy did this and built an 8080 CPU with relays. > > Back when I was considerably younger I enjoyed the sound of a North > Electric relay panel interrogating a phone line to figure which person on > the party line was making the call and then sending the digits via MF > tones. You could diagnose the health of the machine by the sounds. > > *From:* Dave > *Sent:* Monday, July 23, 2018 1:38 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] OT Nixie tubes > > Dont get too complex until you have a functional calculator :) > > Sounds like a fun project vs my Galaga upright arcade restoration :) > I also came across some Gas Filled 4x12" Displays that are dot matrix. > They use 94V to power the Element. > > > > On 07/21/2018 04:04 PM, Chuck McCown wrote: > > Yes, I just found a source of old typewriter keys. I think I will connect > them to microswitches for a nice tactile feedback. > > Analog volt meter showing the capacitor voltage. Will probably need a > voltage doubler to get up to the 180 volts needed for the nixie tubes. > > Things start to dim, crank the crank a few turns. > Do I want to use cloth covered wire and solder terminal sockets. At some > point PCBs will have to be used. So I will probably get lazy and make a > PCB for everything. > > Be fun to have some kind of mechanical annunciator showing the sign of the > exponent. > > Prepper calculator. (Probably a raspberry pi in its heart). > > Maybe use a telephone ringer bell to announce the result. I could add > some delay with the nixie tubes scrolling through the digits and one by one > stopping on the digits of the solution. > > *From:* Chuck Macenski > *Sent:* Saturday, July 21, 2018 2:50 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] OT Nixie tubes > > Old silver and black typewriter keys. Think Enigma machine... > > On Sat, Jul 21, 2018 at 3:28 PM Chuck McCown <[email protected]> wrote: > >> I must be nuts. >> I am working on a calculator project that uses nixie tubes for a display. >> >> I want to use a telephone magneto to charge up a cap to run the thing. >> Kinda a steam punk RPN HP type of calculator. >> I am stuck on what to use for buttons. I am thinking elevator buttons. >> >> Large oak case. Just crank it for 10 seconds and then do your >> calculation. >> >> I am also conflicted as to how many buttons. >> Square and square root for sure. >> Undecided about log, trig functions and whether or not to have scientific >> notation. I think I will. >> How many digits to display? Probably 5. Engineering mode only. 3 dot 2 >> display. >> Also considering multiple lines to show 4 levels of the stack but I doubt >> I will actually do that. >> >> The question is: will I ever finish this thing? >> -- >> AF mailing list >> [email protected] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> > ------------------------------ > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > > -- > > ------------------------------ > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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